PCI Express Multi-Channel DMA Interface
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- Nicholas Gilbert
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1 UG Subscribe The PCI Express DMA Multi-Channel Controller Example Design provides multi-channel support for the Stratix V Avalon Memory-Mapped (Avalon-MM) DMA for PCI Express IP Core. Up to eight external DMA controllers drive DMA descriptors to the PCI Express Multi-Channel DMA Avalon Streaming (Avalon-ST) sink interfaces. The PCI Express Multi-Channel DMA arbitrates between the descriptor queues, taking into account the request priority and the weight. The Data Mover is a module in the soft-logic bridge in the Stratix V Avalon-MM DMA for PCI Express IP Core. Figure 1: Example Design System-Level Block Diagram DMA Controller0 Rd & Wr s0 Status0 PCI Express Multi-Channel DMA Interface Rd & Wr Sub-s Avalon-MM DMA for PCI Express Data Mover Status DMA Controller7 Rd & Wr s7 Status7 Mstr Avalon Streaming 256 bits PCIe TLP PCIe Hard IP G3X8 Control Register Access Memory Avalon-MM 256 bits Avalon-MM 256 bits Mstr All rights reserved. ALTERA, ARRIA, CYCLONE, ENPIRION, MAX, MEGACORE, NIOS, QUARTUS and STRATIX words and logos are trademarks of and registered in the U.S. Patent and Trademark Office and in other countries. All other words and logos identified as trademarks or service marks are the property of their respective holders as described at Altera warrants performance of its semiconductor products to current specifications in accordance with Altera's standard warranty, but reserves the right to make changes to any products and services at any time without notice. Altera assumes no responsibility or liability arising out of the application or use of any information, product, or service described herein except as expressly agreed to in writing by Altera. Altera customers are advised to obtain the latest version of device specifications before relying on any published information and before placing orders for products or services. ISO 9001:2008 Registered Innovation Drive, San Jose, CA 95134
2 2 Figure 2: Internals Block Diagram UG Priority ID Dest Source Length End Orig. ID Sub-ID Dest Source Length Channel 0 4X Fragmentation Priority Sort Channel 1 4X Fragmentation Priority Sort Priority Queue 0 Scheduler to Data Mover Channel 7 Priority Queue 1 4X Fragmentation Priority Sort Status Counter 16x Status Counter 16x Status Counter 16x Status Counters Status from Data Mover Status to Controller Removal Status Queue Avalon-MM Multi-Channel Control Registers (Abort, pause) Original ID 0 Mapped to > 0-7 Original ID 1 Mapped to > 8-15 Original ID 2 Mapped to > Original ID 3 Mapped to > Original ID 4 Mapped to > Original ID 31 Mapped to > Multi-Channel Adapter The Example Design performs the following functions: Stores up to four outstanding descriptors for each channel before deasserting the ready signal Divides each descriptor into subdescriptors with a payload size of 512 bytes Arbitrates between two priority queues based on the Channel Priority Weight Tracks the completion status of the 32 possible outstanding descriptors Forwards completion status to the DMA Controllers Removes descriptors from internal queues on successful completion and in response to a requests received on its Avalon-MM Control register interface When multi-function support is enabled, maps function numbers to channel numbers.
3 UG Device Family Support 3 Note: The Example Design is preliminary in the current release. Both the programming model and top-level signals may change in subsequent releases. Device Family Support Table 1: Device Family Support Stratix V Other device families Device Family Support Final. The IP core is verified with final timing models. The IP core meets all functional and timing requirements for the device family and can be used in production designs. No support. Parameters The PCIe Multi-Channel DMA Interface Example Design has three parameters that you can specify to customize its function. Table 2: Parameteres Parameter Name Value Description Number of channels 2, 4, 8 Specifies the number of channels. Channel priority weight 0, 4, 8 The arbiter uses the Channel priority weight in combination with the descriptor priority bit to calculate the ratio of transmission between priority queues. width 161, 169 Specifies the width of the descriptor. When you select 169, the low-order 8 bits specify the function number for variants with SR-IOV enabled. PCIe Multi-Channel DMA Interfaces The PCIe Multi-Channel DMA Interface Example Design interfaces receive DMA descriptors on up to eight Controller Avalon-ST RX interfaces. It drives the selected descriptor to the Data Mover using its single Avalon-ST TX interface. The Data Mover drives status to the PCIe Multi- Channel DMA on the Status Avalon-ST RX interface. The PCIe Multi-Channel DMA forwards status to the DMA controllers on its Status Avalon-ST source interfaces. An Avalon-MM slave interface allows DMA controllers to remove descriptors from the PCIe Multi-Channel DMA internal queues.
4 4 PCIe Multi-Channel DMA Interfaces UG PCI Express Multi-Channel DMA Controller IP Core Controller0 RX DescInstr0_i[168 or 160:0] DescInstrValid0_i DescInstrReady0_o DmaRxData_o[159:0] DmaRxValid_o DmaRxReady_i TX Controller7 RX DescInstr7_i[167:0] DescInstrValid7_i DescInstrReady7_o DmaTxData_i[31:0] DmaTxValid_i Status RX Status0 DmaTxData0_o[31:0] DmaTxValid0_o Status7 DmaTxData7_o[31:0] DmaTxValid7_o Control Register MCChipSelect_i MCWrite_i MCAddress_i[13:0] MCWriteData_i[31:0] MCWaitRequect_o clk_i rstn_i Related Information Avalon Interface Specifications PCIe Multi-Channel DMA Interfaces Table 3: Controller RX Interface This is an Avalon-ST sink interface. It is synchronous to clk_i. DescInstr<n>i[168 or 160:0] Input Write descriptor or data moving instruction. When SR- IOV is enabled, the bus has the following layout: [168:161]: Function number [160]: Priority [159:0]: Otherwise, the bus has the following layout: [160]: Priority [159:0] This is the format that the Data Mover included in the Avalon-MM DMA for PCI Express requires.
5 UG Control Register Interface 5 DescInstrValid<n> _i Input When asserted, indicates that DescInstr<n>_i is valid. DescInstrReady<n> _o Output When asserted, indicates that the channel can accept new descriptors. The ready latency on this interface is 0 cycles. The Multi-Channel DMA Controller stores data on the rising edge of clock whenever DescInstr- Ready<n> and DescInstrValid<n> are both asserted. Table 4: Status Interface This is an Avalon-ST source interface. DmaTxData<n>_o[31:0] Output Specifies the status for the descriptor ID specified. The following fields are defined: [31:14]: Reserved [13:12]: Status code 2'b00: completed successfully 2'b01: removal completed successfully 2'b10: partially removed 2'b11: removal failed [11:8]: Reserved [7:0]: ID whose status is being reported DmaTxValid<n>_o Output When asserted, indicates that DmaTxData<n>_o[31:0] is valid. This interface does not have a ready input. The requesting controller must be able to store data whenever DmaTxValid<n> is asserted. Control Register Interface To cancel a pending descriptor, a DMA controller writes the descriptor ID to the Avalon-MM slave interface. The Mulit-Channel DMA Interface IP Core drives the status of this request on the Status interface of the requesting controller. Table 5: Control Register Interface This is an Avalon-MM slave interface. It is synchronous to clk_i. MCChipSelect_i Input When asserted, the other signals in this interface are driving valid data. MCWrite_i Input Asserted to perform a write. MCAddress_i[13:0] Input Specifies the address of the Control Register Avalon- MM slave interface.
6 6 TX Interface UG MCWriteData_ i[31:0] Input Specifies the ID for the of the descriptor being deleted. The status of this request is reported on the appropriate Control Status interface. Note: When removal of a descriptor is requested, internal logic searches the pipeline and buffers for the descriptor ID. It may not find the ID requested. The requesting controller must manage appropriately, based on the status reported on the Control Status interface. MCWaitRequest_o Input When asserted, this interface is not ready to accept commands. TX Interface Table 6: TX Interface to Data Mover This is an Avalon-ST source interface. It is synchronous to clk_i. DmaRxData_o[167 or 159:0] Output The DMA Multi-Channel Controller drives descriptor data to the Data Mover on this Avalon-ST source interface. (It uses priority bit[160] internally and does not drive it to the Data Mover. DmaRxValid_o Output When asserted, the data on DmaRxData_o is valid. DmaRxReady_i Input When asserted, the Data Mover is ready to accept new descriptors. The ready latency on this interface is 3 cycles. Consequently, the DMA Multi-Channel Controller must stop driving valid data within 3 cycles of the deassertion of DmaRxReady_i.
7 UG Example Design 7 Table 7: Status Interface This is an Avalon-ST sink interface. the DmaTxData_i[31:0] Input The Data Mover drives status to the DMA Multi- Channel Controller on this Avalon-ST interface. Specifies the status for the descriptor ID specified. The following fields are defined: [31:14]: Reserved. All 0s. [13:12]: Status cod.e 2'b00: completed successfully. 2'b01: removal completed successfully. 2'b10: partially removed. Part of the descriptor has already been processed. The controller must include logic to process partial completion data. 2'b11: removal failed. [11:8]: Reserved. All 0s. [7:0]: ID whose status is being reported. DmaTxValid_i_i Input When asserted, indicates that DmaTxData_i[31:0] is valid. Example Design You can download a Qsys example design that illustrates the use of this component from the install directory, <install_dir>ip/altera/altera_pcie/altera_pcie_hip_256_avmm/channelizer/example_design/. This example design includes the following Qsys files: mc_top_g3x8_4ch.qsys This is the top-level Qsys file that connects the DUT and APPS components. sriov_mcdma_app_g3x8_256b.qsys This Qsys system connects an example Avalon-MM DMA for PCI Express with Single Root I/O Virtualization (SR-IOV) to read and write descriptor controllers and SRAM. rddc_mc_256b.qsys This Qsys system connects four read descriptor controllers the the PCI Express DMA Multi-Channnel Controller IP Core. wrdc_mc_256b.qsys This Qsys system connects four write descriptor controllers the the PCI Express DMA Multi-Channnel Controller IP Core.
8 8 Revision History Figure 3: Qsys Sub-System with Four Write Controllers and the DMA Multi-Channnel Controller UG Revision History Date Version Changes Initial Release.
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