Virtex-5 Libraries Guide for HDL Designs. UG621 (v 14.1) April 24, 2012
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1 Virtex-5 Libraries Guide for HDL Designs UG621 (v 14.1) April 24, 2012 This document applies to the following software versions: ISE Design Suite 14.1 through 14.4
2 tice of Disclaimer The information disclosed to you hereunder (the "Materials") is provided solely for the selection and use of Xilinx products. To the maximum extent permitted by applicable law: (1) Materials are made available "AS IS" and with all faults, Xilinx hereby DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE; and (2) Xilinx shall not be liable (whether in contract or tort, including negligence, or under any other theory of liability) for any loss or damage of any kind or nature related to, arising under, or in connection with, the Materials (including your use of the Materials), including for any direct, indirect, special, incidental, or consequential loss or damage (including loss of data, profits, goodwill, or any type of loss or damage suffered as a result of any action brought by a third party) even if such damage or loss was reasonably foreseeable or Xilinx had been advised of the possibility of the same. Xilinx assumes no obligation to correct any errors contained in the Materials or to notify you of updates to the Materials or to product specifications. You may not reproduce, modify, distribute, or publicly display the Materials without prior written consent. Certain products are subject to the terms and conditions of the Limited Warranties which can be viewed at IP cores may be subject to warranty and support terms contained in a license issued to you by Xilinx. Xilinx products are not designed or intended to be fail-safe or for use in any application requiring fail-safe performance; you assume sole risk and liability for use of Xilinx products in Critical Applications: Copyright Xilinx Inc. All rights reserved. Xilinx, the Xilinx logo, Artix, ISE, Kintex, Spartan, Virtex, Zynq, and other designated brands included herein are trademarks of Xilinx in the United States and other countries. All other trademarks are the property of their respective owners. 2 UG621 (v 14.1) April 24, 2012
3 Chapter 1 Introduction This HDL guide is part of the ISE documentation collection. A separate version of this guide is available if you prefer to work with schematics. This guide contains the following: Introduction. A list of retargeted elements. Descriptions of each available macro. A list of design elements supported in this architecture, organized by functional categories. Descriptions of each available primitive. About Design Elements This version of the Libraries Guide describes the valid design elements for this architecture, and includes examples of instantiation code for each element. Instantiation templates are also supplied in a separate ZIP file, which you can find in your installation directory under ISE/doc/usenglish/isehelp. Design elements are divided into three main categories: Retargeted Elements - These elements are automatically changed by the ISE software tools when they are used in this architecture. Retargeting ensures that your design takes advantage of the latest circuit design advances. Macros - These elements are in the UniMacro library in the Xilinx tool, and are used to instantiate primitives that are complex to instantiate by just using the primitives. The synthesis tools will automatically expand the unimacros to their underlying primitives. Primitives - Xilinx components that are native to the FPGA you are targeting. If you instantiate a primitive in your design, after the translation process (ngdbuild) you will end up with the exact same component in the back end. For example, if you instantiate the Virtex -5 element known as ISERDES_NODELAY as a user primitive, after you run translate (ngdbuild) you will end up with an ISERDES_NODELAY in the back end as well. If you were using ISERDES in a Virtex-5 device, then this will automatically retarget to an ISERDES_NODELAY for Virtex-5 in the back end. Hence, this concept of a primitive differs from other uses of that term in this technology. CORE Generator maintains software libraries with hundreds of functional design elements (UniMacros and primitives) for different device architectures. New functional elements are assembled with each release of development system software. In addition to a comprehensive Unified Library containing all design elements, this guide is one in a series of architecture-specific libraries. UG621 (v 14.1) April 24,
4 Chapter 1: Introduction Design Entry Methods For each design element in this guide, Xilinx evaluates four options for using the design element, and recommends what we believe is the best solution for you. The four options are: Instantiation - This component can be instantiated directly into the design. This method is useful if you want to control the exact placement of the individual blocks. Inference - This component can be inferred by most supported synthesis tools. You should use this method if you want to have complete flexibility and portability of the code to multiple architectures. Inference also gives the tools the ability to optimize for performance, area, or power, as specified by the user to the synthesis tool. Coregen & Wizards - This component can be used through CORE Generator or other Wizards. You should use this method if you want to build large blocks of any FPGA primitive that cannot be inferred. When using this flow, you will have to re-generate your cores for each architecture that you are targeting. Macro Support - This component has a UniMacro that can be used. These components are in the UniMacro library in the Xilinx tool, and are used to instantiate primitives that are too complex to instantiate by just using the primitives. The synthesis tools will automatically expand UniMacros to their underlying primitives. 4 UG621 (v 14.1) April 24, 2012
5 Chapter 2 Design Element Retargeting To ensure that Xilinx customers are able to take full advantage of the latest circuit design advances, certain design elements are automatically changed by the ISE Design Suite software tools when they are used in this architecture. The following table lists these elements and the more advanced elements into which they are transformed. Original Element BUFGCE_1 BUFGMUX BUFGMUX_1 BUFGMUX_VIRTEX4 BUFGP DCM_BASE DCM_PS DSP48 FD FD_1 FDC FDC_1 FDCE FDCE_1 FDCP FDCP_1 FDE FDE_1 FDPE FDPE_1 FDR FDR_1 FDRE FDRE_1 FDRS Modern Equivalent BUFGCE + INV BUFGMUX_CTRL BUFGMUX_CTRL + INV BUFGMUX_CTRL BUFG DCM_ADV DCM_ADV DSP48E FDCPE FDCPE + INV FDCPE FDCPE + INV FDCPE FDCPE + INV FDCPE FDCPE + INV FDCPE FDCPE + INV FDCPE FDCPE + INV FDRSE FDRSE + INV FDRSE FDRSE + INV FDRSE UG621 (v 14.1) April 24,
6 Chapter 2: Design Element Retargeting Original Element FDRS_1 FDS FDS_1 FDSE FDSE_1 FIFO16 ISERDES JTAGPPC LD LD_1 LDC LDC_1 LDCE LDCE_1 LDCP LDCP_1 LDE LDE_1 LDP LDP_1 LDPE LDPE_1 LUT1 LUT1_L LUT1_D LUT2 LUT2_L LUT2_D LUT3 LUT3_L LUT3_D LUT4 LUT4_L LUT4_D MULT_AND MULT18X18 MULT18X18S MUXCY Modern Equivalent FDRSE + INV FDRSE FDRSE + INV FDRSE FDRSE + INV FIFO18 ISERDES_NODELAY JTAG_PPC440 LDCPE LDCPE + INV LDCPE LDCPE + INV LDCPE LDCPE + INV LDCPE LDCPE + INV LDCPE LDCPE + INV LDCPE LDCPE + INV LDCPE LDCPE + INV LUT5 LUT5_L LUT5_D LUT5 LUT5_L LUT5_D LUT5 LUT5_L LUT56_D LUT5 LUT5_L LUT5_D LUT6 DSP48E DSP48E CARRY4 6 UG621 (v 14.1) April 24, 2012
7 Chapter 2: Design Element Retargeting Original Element MUXCY_D MUXCY_L MUXF5 MUXF5_D MUXF5_L MUXF6 MUXF6_D MUXF6_L PMCD RAM16X1D RAM16X1S RAM32X1S RAMB16 RAMB16BWE ROM128X1 ROM16X1 ROM256X1 ROM32X1 ROM64X1 SRLC16 SRLC16_1 SRLC16E SRLC16E_1 XORCY XORCY_D XORCY_L Modern Equivalent CARRY4 CARRY4 LUT5 LUT5_D LUT5_L LUT6 LUT6_D LUT6_L PLL_ADV RAM64X1D RAM64X1S RAM64X1S RAMB18 RAMB18 2 LUT6'S + MUXF7 LUT5 4 LUT6'S + MUXF6/7 LUT5 LUT6 SRLC32E SRLC32E + INV SRLC32E SRLC32E + INV CARRY4 CARRY4 CARRY4 UG621 (v 14.1) April 24,
8 8 UG621 (v 14.1) April 24, 2012
9 Chapter 3 About Unimacros This section describes the unimacros that can be used with this architecture. The unimacros are organized alphabetically. The following information is provided for each unimacro, where applicable: Name of element Brief description Schematic symbol Logic table (if any) Port descriptions Design Entry Method Available attributes Example instantiation code For more information UG621 (v 14.1) April 24,
10 Chapter 3: About Unimacros BRAM_SDP_MACRO Macro: Simple Dual Port RAM Introduction FPGA devices contain several block RAM memories that can be configured as general-purpose 36Kb or 18Kb RAM/ROM memories. These block RAM memories offer fast and flexible storage of large amounts of on-chip data. Both read and write operations are fully synchronous to the supplied clock(s) of the component. However, read and write ports can operate fully independently and asynchronously to each other, accessing the same memory array. Byte-enable write operations are possible, and an optional output register can be used to reduce the clock-to-out times of the RAM. te This element, must be configured so that read and write ports have the same width. Port Description Name Direction Width (Bits) Function Output Ports DO Output See Configuration Table Data output bus addressed by RDADDR. Input Ports DI Input See Configuration Table Data input bus addressed by WRADDR. WRADDR, RDADDR Input See Configuration Table Write/Read address input buses. WE Input See Configuration Table Byte-Wide Write enable UG621 (v 14.1) April 24, 2012
11 Chapter 3: About Unimacros Name Direction Width (Bits) Function WREN, RDEN Input 1 Write/Read enable SSR Input 1 Output registers synchronous reset. REGCE Input 1 Output register clock enable input (valid only when DO_REG=1) WRCLK, RDCLK Input 1 Write/Read clock input. Configuration Table DATA_WIDTH BRAM_SIZE ADDR WE Kb Kb 10 18Kb 9 36Kb 11 18Kb 10 36Kb 12 18Kb 11 36Kb 13 18Kb 12 36Kb 14 18Kb 13 36Kb 15 18Kb Design Entry Method This unimacro can be instantiated only. It is a parameterizable version of the primitive. Consult the Configuration Table above to correctly configure it to meet your design needs. Instantiation Inference CORE Generator and wizards Macro support Yes Recommended UG621 (v 14.1) April 24,
12 Chapter 3: About Unimacros Available Attributes Attribute Data Type Allowed Values Default Description BRAM_SIZE String "36Kb", "18Kb" "18Kb" Configures RAM as "36Kb" or "18Kb" memory. DO_REG Integer 0, 1 0 A value of 1 enables to the output registers to the RAM enabling quicker clock-to-out from the RAM at the expense of an added clock cycle of read latency. A value of 0 allows a read in one clock cycle but will have slower clock to out timing. INIT Hexadecimal Any 72-Bit Value All zeros Specifies the initial value on the output after configuration. READ_WIDTH, WRITE_WIDTH Integer Specifies the size of the DI and DO buses. INIT_FILE String String representing file name and location ne READ_WIDTH and WRITE_WIDTH must be equal. Name of the file containing initial values. SIM_COLLISION_ CHECK String "ALL", "WARNING_ ONLY", "GENERATE_X_ ONLY", "NONE" "ALL" Allows modification of the simulation behavior if a memory collision occurs. The output is affected as follows: "ALL" - Warning produced and affected outputs/memory location go unknown (X). "WARNING_ONLY" - Warning produced and affected outputs/memory retain last value. "GENERATE_X_ONLY" - warning. However, affected outputs/memory go unknown (X). "NONE" - warning and affected outputs/memory retain last value. te Setting this to a value other than "ALL" can allow problems in the design go unnoticed during simulation. Care should be taken when changing the value of this attribute. Please see the Synthesis and Simulation Design Guide for more information. SIM_MODE String "SAFE", "FAST". "SAFE" This is a simulation only attribute. It will direct the simulation model to run in performance-oriented mode when set to "FAST." Please see the Synthesis and Simulation Design Guide for more information. SRVAL Hexadecimal Any 72-Bit Value All zeroes Specifies the output value of on the DO port upon the assertion of the synchronous reset (RST) signal UG621 (v 14.1) April 24, 2012
13 Chapter 3: About Unimacros Attribute Data Type Allowed Values Default Description INIT_00 to INIT_7F INITP_00 to INITP_0F Hexadecimal Any 256-Bit Value All zeroes Allows specification of the initial contents of the 16Kb or 32Kb data memory array. Hexadecimal Any 256-Bit Value All zeroes Allows specification of the initial contents of the 2Kb or 4Kb parity data memory array. VHDL Instantiation Template Unless they already exist, copy the following two statements and paste them before the entity declaration. Library UNISIM; use UNISIM.vcomponents.all; -- BRAM_SDP_MACRO: Simple Dual Port RAM -- Virtex-5 -- Xilinx HDL Libraries Guide, version te - This Unimacro model assumes the port directions to be "downto". -- Simulation of this model with "to" in the port directions could lead to erroneous results. BRAM_SDP_MACRO_inst : BRAM_SDP_MACRO generic map ( BRAM_SIZE => "18Kb", -- Target BRAM, "18Kb" or "36Kb" DEVICE => "VIRTEX5", -- Target device: "VIRTEX5", "VIRTEX6", "SPARTAN6" WRITE_WIDTH => 0, -- Valid values are 1-72 (37-72 only valid when BRAM_SIZE="36Kb") READ_WIDTH => 0, -- Valid values are 1-72 (37-72 only valid when BRAM_SIZE="36Kb") DO_REG => 0, -- Optional output register (0 or 1) INIT_FILE => "NONE", SIM_COLLISION_CHECK => "ALL", -- Collision check enable "ALL", "WARNING_ONLY", -- "GENERATE_X_ONLY" or "NONE" SIM_MODE => "SAFE", -- Simulation: "SAFE" vs "FAST", -- see "Synthesis and Simulation Design Guide" for details SRVAL => X" ", -- Set/Reset value for port output INIT => X" ", -- Initial values on output port -- The following INIT_xx declarations specify the initial contents of the RAM INIT_00 => X" ", INIT_01 => X" ", INIT_02 => X" ", INIT_03 => X" ", INIT_04 => X" ", INIT_05 => X" ", INIT_06 => X" ", INIT_07 => X" ", INIT_08 => X" ", INIT_09 => X" ", INIT_0A => X" ", INIT_0B => X" ", INIT_0C => X" ", INIT_0D => X" ", INIT_0E => X" ", INIT_0F => X" ", INIT_10 => X" ", INIT_11 => X" ", INIT_12 => X" ", INIT_13 => X" ", INIT_14 => X" ", INIT_15 => X" ", INIT_16 => X" ", INIT_17 => X" ", INIT_18 => X" ", INIT_19 => X" ", INIT_1A => X" ", INIT_1B => X" ", INIT_1C => X" ", INIT_1D => X" ", INIT_1E => X" ", UG621 (v 14.1) April 24,
14 Chapter 3: About Unimacros INIT_1F => X" ", INIT_20 => X" ", INIT_21 => X" ", INIT_22 => X" ", INIT_23 => X" ", INIT_24 => X" ", INIT_25 => X" ", INIT_26 => X" ", INIT_27 => X" ", INIT_28 => X" ", INIT_29 => X" ", INIT_2A => X" ", INIT_2B => X" ", INIT_2C => X" ", INIT_2D => X" ", INIT_2E => X" ", INIT_2F => X" ", INIT_30 => X" ", INIT_31 => X" ", INIT_32 => X" ", INIT_33 => X" ", INIT_34 => X" ", INIT_35 => X" ", INIT_36 => X" ", INIT_37 => X" ", INIT_38 => X" ", INIT_39 => X" ", INIT_3A => X" ", INIT_3B => X" ", INIT_3C => X" ", INIT_3D => X" ", INIT_3E => X" ", INIT_3F => X" ", -- The next set of INIT_xx are valid when configured as 36Kb INIT_40 => X" ", INIT_41 => X" ", INIT_42 => X" ", INIT_43 => X" ", INIT_44 => X" ", INIT_45 => X" ", INIT_46 => X" ", INIT_47 => X" ", INIT_48 => X" ", INIT_49 => X" ", INIT_4A => X" ", INIT_4B => X" ", INIT_4C => X" ", INIT_4D => X" ", INIT_4E => X" ", INIT_4F => X" ", INIT_50 => X" ", INIT_51 => X" ", INIT_52 => X" ", INIT_53 => X" ", INIT_54 => X" ", INIT_55 => X" ", INIT_56 => X" ", INIT_57 => X" ", INIT_58 => X" ", INIT_59 => X" ", INIT_5A => X" ", INIT_5B => X" ", INIT_5C => X" ", INIT_5D => X" ", INIT_5E => X" ", INIT_5F => X" ", INIT_60 => X" ", INIT_61 => X" ", INIT_62 => X" ", INIT_63 => X" ", INIT_64 => X" ", INIT_65 => X" ", 14 UG621 (v 14.1) April 24, 2012
15 Chapter 3: About Unimacros INIT_66 => X" ", INIT_67 => X" ", INIT_68 => X" ", INIT_69 => X" ", INIT_6A => X" ", INIT_6B => X" ", INIT_6C => X" ", INIT_6D => X" ", INIT_6E => X" ", INIT_6F => X" ", INIT_70 => X" ", INIT_71 => X" ", INIT_72 => X" ", INIT_73 => X" ", INIT_74 => X" ", INIT_75 => X" ", INIT_76 => X" ", INIT_77 => X" ", INIT_78 => X" ", INIT_79 => X" ", INIT_7A => X" ", INIT_7B => X" ", INIT_7C => X" ", INIT_7D => X" ", INIT_7E => X" ", INIT_7F => X" ", -- The next set of INITP_xx are for the parity bits INITP_00 => X" ", INITP_01 => X" ", INITP_02 => X" ", INITP_03 => X" ", INITP_04 => X" ", INITP_05 => X" ", INITP_06 => X" ", INITP_07 => X" ", -- The next set of INIT_xx are valid when configured as 36Kb INITP_08 => X" ", INITP_09 => X" ", INITP_0A => X" ", INITP_0B => X" ", INITP_0C => X" ", INITP_0D => X" ", INITP_0E => X" ", INITP_0F => X" ") port map ( DO => DO, -- Output read data port DI => DI, -- Input write data port RDADDR => RDADDR, -- Input read address RDCLK => RDCLK, -- Input read clock RDEN => RDEN, -- Input read port enable REGCE => REGCE, -- Input read output register enable RST => RST, -- Input reset WE => WE, -- Input write enable WRADDR => WRADDR, -- Input write address WRCLK => WRCLK, -- Input write clock WREN => WREN -- Input write port enable -- End of BRAM_SDP_MACRO_inst instantiation Verilog Instantiation Template // BRAM_SDP_MACRO: Simple Dual Port RAM // Virtex-5 // Xilinx HDL Libraries Guide, version 14.1 /////////////////////////////////////////////////////////////////////// // READ_WIDTH BRAM_SIZE READ Depth RDADDR Width // // WRITE_WIDTH WRITE Depth WRADDR Width WE Width // // ============ =========== ============= ============== ============// UG621 (v 14.1) April 24,
16 Chapter 3: About Unimacros // "36Kb" bit 8-bit // // "36Kb" bit 4-bit // // "18Kb" bit 4-bit // // "36Kb" bit 2-bit // // "18Kb" bit 2-bit // // 5-9 "36Kb" bit 1-bit // // 5-9 "18Kb" bit 1-bit // // 3-4 "36Kb" bit 1-bit // // 3-4 "18Kb" bit 1-bit // // 2 "36Kb" bit 1-bit // // 2 "18Kb" bit 1-bit // // 1 "36Kb" bit 1-bit // // 1 "18Kb" bit 1-bit // /////////////////////////////////////////////////////////////////////// BRAM_SDP_MACRO #(.BRAM_SIZE("18Kb"), // Target BRAM, "18Kb" or "36Kb".DEVICE("VIRTEX5"), // Target device: "VIRTEX5", "VIRTEX6", "SPARTAN6".WRITE_WIDTH(0), // Valid values are 1-72 (37-72 only valid when BRAM_SIZE="36Kb").READ_WIDTH(0), // Valid values are 1-72 (37-72 only valid when BRAM_SIZE="36Kb").DO_REG(0), // Optional output register (0 or 1).INIT_FILE ("NONE"),.SIM_COLLISION_CHECK ("ALL"), // Collision check enable "ALL", "WARNING_ONLY", // "GENERATE_X_ONLY" or "NONE".SIM_MODE("SAFE"), // Simulation: "SAFE" vs. "FAST", see "Synthesis and Simulation Design Guide" for details.srval(72'h ), // Set/Reset value for port output.init(72'h ), // Initial values on output port.init_00(256'h ),.init_01(256'h ),.init_02(256'h ),.init_03(256'h ),.init_04(256'h ),.init_05(256'h ),.init_06(256'h ),.init_07(256'h ),.init_08(256'h ),.init_09(256'h ),.init_0a(256'h ),.init_0b(256'h ),.init_0c(256'h ),.init_0d(256'h ),.init_0e(256'h ),.init_0f(256'h ),.init_10(256'h ),.init_11(256'h ),.init_12(256'h ),.init_13(256'h ),.init_14(256'h ),.init_15(256'h ),.init_16(256'h ),.init_17(256'h ),.init_18(256'h ),.init_19(256'h ),.init_1a(256'h ),.init_1b(256'h ),.init_1c(256'h ),.init_1d(256'h ),.init_1e(256'h ),.init_1f(256'h ),.init_20(256'h ),.init_21(256'h ),.init_22(256'h ),.init_23(256'h ),.init_24(256'h ),.init_25(256'h ),.init_26(256'h ),.init_27(256'h ),.init_28(256'h ),.init_29(256'h ),.init_2a(256'h ),.init_2b(256'h ),.init_2c(256'h ),.init_2d(256'h ), 16 UG621 (v 14.1) April 24, 2012
17 Chapter 3: About Unimacros.INIT_2E(256'h ),.INIT_2F(256'h ),.INIT_30(256'h ),.INIT_31(256'h ),.INIT_32(256'h ),.INIT_33(256'h ),.INIT_34(256'h ),.INIT_35(256'h ),.INIT_36(256'h ),.INIT_37(256'h ),.INIT_38(256'h ),.INIT_39(256'h ),.INIT_3A(256'h ),.INIT_3B(256'h ),.INIT_3C(256'h ),.INIT_3D(256'h ),.INIT_3E(256'h ),.INIT_3F(256'h ), // The next set of INIT_xx are valid when configured as 36Kb.INIT_40(256'h ),.INIT_41(256'h ),.INIT_42(256'h ),.INIT_43(256'h ),.INIT_44(256'h ),.INIT_45(256'h ),.INIT_46(256'h ),.INIT_47(256'h ),.INIT_48(256'h ),.INIT_49(256'h ),.INIT_4A(256'h ),.INIT_4B(256'h ),.INIT_4C(256'h ),.INIT_4D(256'h ),.INIT_4E(256'h ),.INIT_4F(256'h ),.INIT_50(256'h ),.INIT_51(256'h ),.INIT_52(256'h ),.INIT_53(256'h ),.INIT_54(256'h ),.INIT_55(256'h ),.INIT_56(256'h ),.INIT_57(256'h ),.INIT_58(256'h ),.INIT_59(256'h ),.INIT_5A(256'h ),.INIT_5B(256'h ),.INIT_5C(256'h ),.INIT_5D(256'h ),.INIT_5E(256'h ),.INIT_5F(256'h ),.INIT_60(256'h ),.INIT_61(256'h ),.INIT_62(256'h ),.INIT_63(256'h ),.INIT_64(256'h ),.INIT_65(256'h ),.INIT_66(256'h ),.INIT_67(256'h ),.INIT_68(256'h ),.INIT_69(256'h ),.INIT_6A(256'h ),.INIT_6B(256'h ),.INIT_6C(256'h ),.INIT_6D(256'h ),.INIT_6E(256'h ),.INIT_6F(256'h ),.INIT_70(256'h ),.INIT_71(256'h ),.INIT_72(256'h ),.INIT_73(256'h ),.INIT_74(256'h ), UG621 (v 14.1) April 24,
18 Chapter 3: About Unimacros.INIT_75(256'h ),.INIT_76(256'h ),.INIT_77(256'h ),.INIT_78(256'h ),.INIT_79(256'h ),.INIT_7A(256'h ),.INIT_7B(256'h ),.INIT_7C(256'h ),.INIT_7D(256'h ),.INIT_7E(256'h ),.INIT_7F(256'h ), // The next set of INITP_xx are for the parity bits.initp_00(256'h ),.initp_01(256'h ),.initp_02(256'h ),.initp_03(256'h ),.initp_04(256'h ),.initp_05(256'h ),.initp_06(256'h ),.initp_07(256'h ), // The next set of INITP_xx are valid when configured as 36Kb.INITP_08(256'h ),.INITP_09(256'h ),.INITP_0A(256'h ),.INITP_0B(256'h ),.INITP_0C(256'h ),.INITP_0D(256'h ),.INITP_0E(256'h ),.INITP_0F(256'h ) ) BRAM_SDP_MACRO_inst (.DO(DO), // Output read data port.di(di), // Input write data port.rdaddr(rdaddr), // Input read address.rdclk(rdclk), // Input read clock.rden(rden), // Input read port enable.regce(regce), // Input read output register enable.rst(rst), // Input reset.we(we), // Input write enable.wraddr(wraddr), // Input write address.wrclk(wrclk), // Input write clock.wren(wren) // Input write port enable // End of BRAM_SDP_MACRO_inst instantiation For More Information See the Virtex-5 FPGA User Guide. See the Virtex-5 FPGA Data Sheet DC and Switching Characteristics UG621 (v 14.1) April 24, 2012
19 Chapter 3: About Unimacros BRAM_SINGLE_MACRO Macro: Single Port RAM Introduction FPGA devices contain several block RAM memories that can be configured as general-purpose 36Kb or 18Kb RAM/ROM memories. These single-port, block RAM memories offer fast and flexible storage of large amounts of on-chip data. Byte-enable write operations are possible, and an optional output register can be used to reduce the clock-to-out times of the RAM. Port Description Name Direction Width Function Output Ports DO Output See Configuration Table below. Data output bus addressed by ADDR. Input Ports DI Input See Configuration Table below. ADDR Input See Configuration Table below. WE Input See Configuration Table below. Data input bus addressed by ADDR. Address input bus. Byte-Wide Write enable. EN Input 1 Write/Read enables. RST Input 1 Output registers synchronous reset. REGCE Input 1 Output register clock enable input (valid only when DO_REG=1) CLK Input 1 Clock input. UG621 (v 14.1) April 24,
20 Chapter 3: About Unimacros Configuration Table WRITE_WIDTH READ_WIDTH BRAM_SIZE ADDR WE Kb Kb Kb Kb Kb Kb UG621 (v 14.1) April 24, 2012
21 Chapter 3: About Unimacros WRITE_WIDTH READ_WIDTH BRAM_SIZE ADDR WE Kb Kb Kb Kb Kb Kb UG621 (v 14.1) April 24,
22 Chapter 3: About Unimacros Design Entry Method This unimacro can be instantiated only. It is a parameterizable version of the primitive. Consult the above Configuration Table in correctly configuring this element to meet your design needs. Instantiation Inference CORE Generator and wizards Macro support Yes Recommended Available Attributes Attribute Data Type Allowed Values Default Description BRAM_SIZE String "36Kb", "18Kb" "18Kb" Configures RAM as 36Kb or 18Kb memory. DO_REG Integer 0, 1 0 A value of 1 enables to the output registers to the RAM enabling quicker clock-to-out from the RAM at the expense of an added clock cycle of read latency. A value of 0 allows a read in one clock cycle but will have slower clock to out timing. READ_WIDTH, WRITE_WIDTH Integer Specifies the size of the DI and DO buses. INIT_FILE String String representing file name and location NONE The following combinations are allowed: READ_WIDTH = WRITE_WIDTH If asymmetric, READ_WIDTH and WRITE_WIDTH must be in the ratio of 2, or must be values allowed by the unisim (1, 2, 4, 8, 9, 16, 18, 32, 36, 64, 72) Name of the file containing initial values. WRITE_MODE String "READ_FIRST", "WRITE_FIRST", "NO_CHANGE" "WRITE_FIRST" Specifies write mode to the memory INIT Hexadecimal Any 72-Bit Value All zeros Specifies the initial value on the output after configuration. SRVAL Hexadecimal Any 72-Bit Value All zeroes Specifies the output value of on the DO port upon the assertion of the synchronous reset (RST) signal. SIM_MODE String "SAFE", "FAST" "SAFE" This is a simulation only attribute. It will direct the simulation model to run in performance-oriented mode when set to "FAST." Please see the Synthesis and Simulation Design Guide for more information. INIT_00 to INIT_FF INITP_00 to INITP_0F Hexadecimal Any 256-Bit Value All zeroes Allows specification of the initial contents of the 16Kb or 32Kb data memory array. Hexadecimal Any 256-Bit Value All zeroes Allows specification of the initial contents of the 2Kb or 4Kb parity data memory array. VHDL Instantiation Template Unless they already exist, copy the following two statements and paste them before the entity declaration UG621 (v 14.1) April 24, 2012
23 Chapter 3: About Unimacros Library UNISIM; use UNISIM.vcomponents.all; -- BRAM_SINGLE_MACRO: Single Port RAM -- Virtex-5 -- Xilinx HDL Libraries Guide, version te - This Unimacro model assumes the port directions to be "downto". -- Simulation of this model with "to" in the port directions could lead to erroneous results. BRAM_SINGLE_MACRO_inst : BRAM_SINGLE_MACRO generic map ( BRAM_SIZE => "18Kb", -- Target BRAM, "18Kb" or "36Kb" DEVICE => "VIRTEX5", -- Target Device: "VIRTEX5", "VIRTEX6", "SPARTAN6" DO_REG => 0, -- Optional output register (0 or 1) INIT => X" ", -- Initial values on output port INIT_FILE => "NONE", WRITE_WIDTH => 0, -- Valid values are 1-72 (37-72 only valid when BRAM_SIZE="36Kb") READ_WIDTH => 0, -- Valid values are 1-72 (37-72 only valid when BRAM_SIZE="36Kb") SIM_MODE => "SAFE", -- Simulation: "SAFE" vs "FAST", -- see "Synthesis and Simulation Design Guide" for details SRVAL => X" ", -- Set/Reset value for port output WRITE_MODE => "WRITE_FIRST", -- "WRITE_FIRST", "READ_FIRST" or "NO_CHANGE" -- The following INIT_xx declarations specify the initial contents of the RAM INIT_00 => X" ", INIT_01 => X" ", INIT_02 => X" ", INIT_03 => X" ", INIT_04 => X" ", INIT_05 => X" ", INIT_06 => X" ", INIT_07 => X" ", INIT_08 => X" ", INIT_09 => X" ", INIT_0A => X" ", INIT_0B => X" ", INIT_0C => X" ", INIT_0D => X" ", INIT_0E => X" ", INIT_0F => X" ", INIT_10 => X" ", INIT_11 => X" ", INIT_12 => X" ", INIT_13 => X" ", INIT_14 => X" ", INIT_15 => X" ", INIT_16 => X" ", INIT_17 => X" ", INIT_18 => X" ", INIT_19 => X" ", INIT_1A => X" ", INIT_1B => X" ", INIT_1C => X" ", INIT_1D => X" ", INIT_1E => X" ", INIT_1F => X" ", INIT_20 => X" ", INIT_21 => X" ", INIT_22 => X" ", INIT_23 => X" ", INIT_24 => X" ", INIT_25 => X" ", INIT_26 => X" ", INIT_27 => X" ", INIT_28 => X" ", INIT_29 => X" ", INIT_2A => X" ", INIT_2B => X" ", INIT_2C => X" ", INIT_2D => X" ", INIT_2E => X" ", INIT_2F => X" ", UG621 (v 14.1) April 24,
24 Chapter 3: About Unimacros INIT_30 => X" ", INIT_31 => X" ", INIT_32 => X" ", INIT_33 => X" ", INIT_34 => X" ", INIT_35 => X" ", INIT_36 => X" ", INIT_37 => X" ", INIT_38 => X" ", INIT_39 => X" ", INIT_3A => X" ", INIT_3B => X" ", INIT_3C => X" ", INIT_3D => X" ", INIT_3E => X" ", INIT_3F => X" ", -- The next set of INIT_xx are valid when configured as 36Kb INIT_40 => X" ", INIT_41 => X" ", INIT_42 => X" ", INIT_43 => X" ", INIT_44 => X" ", INIT_45 => X" ", INIT_46 => X" ", INIT_47 => X" ", INIT_48 => X" ", INIT_49 => X" ", INIT_4A => X" ", INIT_4B => X" ", INIT_4C => X" ", INIT_4D => X" ", INIT_4E => X" ", INIT_4F => X" ", INIT_50 => X" ", INIT_51 => X" ", INIT_52 => X" ", INIT_53 => X" ", INIT_54 => X" ", INIT_55 => X" ", INIT_56 => X" ", INIT_57 => X" ", INIT_58 => X" ", INIT_59 => X" ", INIT_5A => X" ", INIT_5B => X" ", INIT_5C => X" ", INIT_5D => X" ", INIT_5E => X" ", INIT_5F => X" ", INIT_60 => X" ", INIT_61 => X" ", INIT_62 => X" ", INIT_63 => X" ", INIT_64 => X" ", INIT_65 => X" ", INIT_66 => X" ", INIT_67 => X" ", INIT_68 => X" ", INIT_69 => X" ", INIT_6A => X" ", INIT_6B => X" ", INIT_6C => X" ", INIT_6D => X" ", INIT_6E => X" ", INIT_6F => X" ", INIT_70 => X" ", INIT_71 => X" ", INIT_72 => X" ", INIT_73 => X" ", INIT_74 => X" ", INIT_75 => X" ", INIT_76 => X" ", 24 UG621 (v 14.1) April 24, 2012
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