Altera JESD204B IP Core and ADI AD9680 Hardware Checkout Report

Transcription

1 Altera JESD204B IP Core and ADI AD9680 Hardware Checkout Report AN-710 Subscribe The Altera JESD204B IP core is a high-speed point-to-point serial interface intellectual property (IP). The JESD204B IP core has been hardware-tested with a number of selected JESD204B-compliant ADC (analog-to-digital converter) devices. This report highlights the interoperability of the JESD204B IP core with the AD9680 converter evaluation module (EVM) from Analog Devices Inc. (ADI). The following sections describe the hardware checkout methodology and test results. Related Information JESD204B IP Core User Guide ADI AD9680 Datasheet Hardware Requirements The hardware checkout test requires the following hardware and software tools: Stratix V Advanced Systems Development Kit with 15 V power adaptor Arria 10 FPGA Development Kit ADI AD9680 EVM with 4.5 V power adaptor (1) Mini-USB cable Clock source card capable of generating configurable device clock frequencies Related Information Parameter Configuration on page 12 (1) The power adaptor is not needed for the production version of AD EBZ EVM (as shown in Figure 3) 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 Hardware Setup for Stratix V Advanced Systems Development Kit AN Hardware Setup for Stratix V Advanced Systems Development Kit Figure 1: Hardware Setup A Stratix V Advanced Systems Development Kit is used with the ADI AD9680 daughter card module (3) attached to the FMC connector on the development board. The AD9680 EVM derives power from 4.5 V power adaptor. The FPGA and ADC device clock is supplied by external clock source card through the SMA connectors on the AD9680 EVM. Both the FPGA and ADC device clock must be sourced from the same clock source card with two different frequencies, one for the FPGA and one for ADC. For subclass 1, the FPGA generates SYSREF for the JESD204B IP core as well as the AD9680 device. Transceiver Lanes Stratix V Advanced Systems Development Kit Device Clock rx_dev_sync_n sysref SPI ADI AD9680 EVM (3) The AD9680 EVM used in this report differs from the production version of AD EBZ EVM. However, there is no difference in terms of functionality between these two EVM.

3 AN Hardware Setup for Stratix V Advanced Systems Development Kit 3 Figure 2: System Diagram The system-level diagram shows how the different modules connect in this design. In this setup, where LMF=421, the data rate of transceiver lanes is 12.5 Gbps. An external clock source card provides MHz clock to the FPGA and 1250 MHz sampling clock to AD9680 device. mgmt_clk jesd204b_ed_top.sv Stratix V FPGA #1 FMC AD9680 EVM jesd204b_ed.sv SignalTap II rx_serial_data[3:0] (12.5Gbps) L0 L3 ADC Qsys System ADC JTAG to Avalon Master Bridge Avalon MM Slave Translator PIO Avalon-MM Interface signals global_rst_n Design Example JESD204B IP Core (Duplex) L=4,M=2,F=1 sclk, ss_n[0], miso, mosi device_clk (312.5MHz) link_clk (312.5MHz) Sysref generator rx_dev_sync_n 4-wire Conversion circuit SMA sysref_out K=32) 3-wire SPI Slave CLK & SYNC AD9680 sync_n sysref SMA 1.25 GHz

4 4 Hardware Setup for Arria 10 FPGA Development Kit AN Hardware Setup for Arria 10 FPGA Development Kit Figure 3: Hardware Setup An Arria 10 FPGA Development Kit is used with the ADI AD9680 daughter card module attached to the FMC connector on the development board. (4) The FPGA and ADC device clock is supplied by external clock source card through the SMA connectors on the AD9680 EVM. Both the FPGA and ADC device clock must be sourced from the same clock source card with two different frequencies, one for the FPGA and one for ADC. For subclass 1, the FPGA generates SYSREF for the JESD204B IP core as well as the AD9680 device. Arria 10 FPGA Development Kit Clock Source ADI AD9680 EVM (4) The AD9680 EVM used in this report differs from the production version of AD EBZ EVM. However, there is no difference in terms of functionality between these two EVM.

5 AN Hardware Checkout Methodology 5 Figure 4: System Diagram The system-level diagram shows how the different modules connect in this design. In this setup, where LMF=222, the data rate of transceiver lanes is 12.5 Gbps. An external clock source card provides MHz clock to the FPGA and 625 MHz sampling clock to AD9680 device. mgmt_clk jesd204b_ed_top.sv SignalTap II jesd204b_ed.sv Arria 10 FPGA FMC rx_serial_data[1:0] (12.5 Gbps) L0 L3 AD9680 EVM ADC Qsys System ADC JTAG to Avalon Master Bridge Avalon MM Slave Translator PIO Avalon-MM Interface signals global_rst_n Design Example JESD204B IP Core (Duplex) L=2,M=2,F=2 sclk, ss_n[0], miso, mosi device_clk (312.5 MHz) link_clk (312.5 MHz) Sysref generator rx_dev_sync_n 4-wire Conversion circuit sysref_out (19.53 K=32) 3-wire SPI Slave CLK & SYNC AD9680 sync_n sysref 625 MHz External Clock Source Hardware Checkout Methodology The following section describes the test objectives, procedure, and the passing criteria. The test covers the following areas: Receiver data link layer Receiver transport layer Descrambling Deterministic latency (Subclass 1) Receiver Data Link Layer This test area covers the test cases for code group synchronization (CGS) and initial frame and lane synchronization. On link start up, the receiver issues a synchronization request and the transmitter transmits /K/ (K28.5) characters. The SignalTap II Logic Analyzer tool monitors the receiver data link layer operation.

6 6 Code Group Synchronization (CGS) Code Group Synchronization (CGS) AN Table 1: CGS Test Cases Test Case Objective Description Passing Criteria CGS.1 CGS.2 Check whether sync request is deasserted after a correct reception of four successive / K/ characters. Check full CGS at the receiver after correct reception of another four 8B/10B characters. The following signals in <ip_variant_ name>_inst_phy.v are tapped: jesd204_rx_pcs_data[(l*32)- 1:0] jesd204_rx_pcs_data_valid[l- 1:0] jesd204_rx_pcs_kchar_ data[(l*4)-1:0] (5) The following signals in <ip_variant_ name>.v are tapped: rx_dev_sync_n jesd204_rx_int The rxlink_clk is used as the SignalTap II sampling clock. Each lane is represented by 32-bit data bus in the jesd204_rx_pcs_data signal. The 32-bit data bus is divided into 4 octets. The following signals in <ip_variant_ name>_inst_phy.v are tapped: jesd204_rx_pcs_ errdetect[(l*4)-1:0] jesd204_rx_pcs_disperr[(l*4)- 1:0] (5) The following signal in <ip_variant_ name>.v is tapped: jesd204_rx_int The rxlink_clk is used as the SignalTap II sampling clock. /K/ character or K28.5 (0xBC) is observed at each octet of the jesd204_rx_pcs_data bus. The jesd204_rx_pcs_data_ valid signal is asserted to indicate that data from the PCS is valid. The jesd204_rx_pcs_kchar_ data signal is asserted whenever control characters like /K/, /R/, / Q/ or /A/ characters are observed. The rx_dev_sync_n signal is deasserted after a correct reception of at least four successive /K/ characters. The jesd204_rx_int signal is deasserted if there is no error. The jesd204_rx_pcs_errdetect, jesd204_rx_pcs_disperr, and jesd204_rx_int signals should not be asserted during CGS phase. (5) L is the number of lanes.

7 AN Initial Frame and Lane Synchronization 7 Initial Frame and Lane Synchronization Table 2: Initial Frame and Lane Synchronization Test Cases Test Case Objective Description Passing Criteria ILA. 1 Check whether the initial frame synchronization state machine enters FS_DATA state upon receiving non /K/ characters. The following signals in <ip_variant_ name>_inst_phy.v are tapped: jesd204_rx_pcs_data[(l*32)- 1:0] jesd204_rx_pcs_data_valid[l- 1:0] jesd204_rx_pcs_kchar_ data[(l*4)-1:0] (5) The following signals in <ip_variant_ name>.v are tapped: rx_dev_sync_n jesd204_rx_int The rxlink_clk is used as the SignalTap II sampling clock. Each lane is represented by 32-bit data bus in jesd204_rx_pcs_data. signal. The 32-bit data bus for is divided into 4 octets. /R/ character or K28.0 (0x1C) is observed after /K/ character at the jesd204_rx_pcs_data bus. The jesd204_rx_pcs_data_ valid signal must be asserted to indicate that data from the PCS is valid. The rx_dev_sync_n and jesd204_rx_int signals are deasserted. Each multiframe in ILAS phase ends with /A/ character or K28.3 (0x7C). The jesd204_rx_pcs_kchar_ data signal is asserted whenever control characters like /K/, /R/, / Q/ or /A/ characters are observed.

8 8 Receiver Transport Layer AN Test Case Objective Description Passing Criteria ILA. 2 Check the JESD204B configuration parameters from ADC in second multiframe. The following signals in <ip_variant_ name>_inst_phy.v are tapped: jesd204_rx_pcs_data[(l*32)- 1:0] jesd204_rx_pcs_data_valid[l- 1:0] (5) The following signal in <ip_variant_ name>.v is tapped: /R/ character is followed by /Q/ character or K28.4 (0x9C) at the beginning of second multiframe. The jesd204_rx_int signal is deasserted if there is no error. Octets 0-13 read from these registers match with the JESD204B parameters in each test setup. jesd204_rx_int The rxlink_clk is used as the SignalTap II sampling clock. The system console accesses the following registers: ilas_octet0 ilas_octet1 ilas_octet2 ilas_octet3 The content of 14 configuration octets in the second multiframe is stored in these 32-bit registers ilas_octet0, ilas_ octet1, ilas_octet2, and ilas_octet3. ILA. 3 Check the lane alignment The following signals in <ip_variant_ name>_inst_phy.v are tapped: jesd204_rx_pcs_data[(l*32)- 1:0] jesd204_rx_pcs_data_valid[l- 1:0] (5) The following signals in <ip_variant_ name>.v are tapped: rx_somf[3:0] dev_lane_aligned jesd204_rx_int The dev_lane_aligned signal is asserted upon the last /A/ character received by the ILAS, which is followed by the first data octet. The rx_somf signal marks the start of multiframe in user data phase. The jesd204_rx_int signal is deasserted if there is no error. The rxlink_clk is used as the SignalTap II sampling clock. Receiver Transport Layer To check the data integrity of the payload data stream through the RX JESD204B IP core and transport layer, the ADC is configured to output PRBS-9 test data pattern. The ADC is also set to operate with the same configuration as set in the JESD204B IP core. The PRBS checker in the FPGA fabric checks data integrity for one minute.

9 AN Descrambling 9 Figure 5: Data Integrity Check Using PRBS Checker This figure shows the conceptual test setup for data integrity checking. ADC PRBS Generator TX Transport Layer TX PHY and Link Layer FPGA PRBS Checker RX Transport Layer RX JESD204B IP Core PHY and Link Layer The SignalTap II Logic Analyzer tool monitors the operation of the RX transport layer. Table 3: Transport Layer Test Cases Test Case Objective Description Passing Criteria TL.1 Check the transport layer mapping using PRBS-9 test pattern. The following signal in altera_ jesd204_transport_rx_top.sv are tapped: jesd204_rx_data_valid The following signals in jesd204b_ed.v are tapped: The jesd204_rx_data_valid signal is asserted. The data_error and jesd204_ rx_int signals are deasserted. data_error jesd204_rx_int The rxframe_clk is used as the SignalTap II sampling clock. The data_error signal indicates a pass or fail for the PRBS checker. Descrambling The PRBS checker at the RX transport layer checks the data integrity of descrambler. The SignalTap II Logic Analyzer tool monitors the operation of the RX transport layer.

10 10 Deterministic Latency (Subclass 1) AN Table 4: Descrambler Test Cases Test Case Objective Description Passing Criteria SCR.1 Check the functionality of the descrambler using PRBS-9 test pattern. Enable scrambler at the ADC and descrambler at the RX JESD204B IP core. The signals that are tapped in this test case are similar to test case TL.1 The jesd204_rx_data_valid signal is asserted. The data_error and jesd204_ rx_int signals are deasserted. Deterministic Latency (Subclass 1) Figure below shows the block diagram of deterministic latency test setup. A SYSREF generator provides a periodic SYSREF pulse for both the AD9680 and JESD204B IP core. The SYSREF generator is running in link clock domain and the period of SYSREF pulse is configured to the desired multiframe size. The SYSREF pulse restarts the LMF counter and realigns it to the LMFC boundary. Figure 6: Deterministic Latency Test Setup Block Diagram for Stratix V FPGA mgmt_clk jesd204b_ed_top.sv SignalTap II Deterministic Latency Measurement jesd204b_ed.sv Stratix V FPGA #1 FMC rx_serial_data[3:0] (12.5Gbps) L0 L3 AD9680 EVM ADC ADC Qsys System JTAG to Avalon Master Bridge Avalon MM Slave Translator PIO Avalon-MM Interface signals global_rst_n Design Example JESD204B IP Core (Duplex) L=4,M=2,F=1 sclk, ss_n[0], miso, mosi device_clk (312.5MHz) link_clk (312.5MHz) Sysref generator rx_dev_sync_n 4-wire Conversion circuit SMA sysref_out K=32) 3-wire sync_n SPI Slave CLK & SYNC AD9680 SMA sysref 1.25GHz

11 AN Deterministic Latency (Subclass 1) 11 Figure 7: Deterministic Latency Test Setup Block Diagram for Arria 10 FPGA mgmt_clk jesd204b_ed_top.sv SignalTap II Deterministic Latency Measurement jesd204b_ed.sv Arria 10 FPGA FMC rx_serial_data[1:0] (12.5 Gbps) L0 L3 AD9680 EVM ADC ADC Qsys System JTAG to Avalon Master Bridge Avalon MM Slave Translator PIO Avalon-MM Interface signals global_rst_n Design Example JESD204B IP Core (Duplex) L=2,M=2,F=2 sclk, ss_n[0], miso, mosi device_clk (312.5 MHz) link_clk (312.5 MHz) Sysref generator rx_dev_sync_n 4-wire Conversion circuit sysref_out (19.53 K=32) 3-wire sync_n SPI Slave CLK & SYNC AD9680 sysref 625 MHz External Clock Source Figure 8: Deterministic Latency Measurement Timing Diagram Link Clock State ILAS USER_DATA SYNC~ RX Valid sync_to_rxvalid_cnt n - 1 n With the setup above, three test cases are defined to prove deterministic latency. The continuous SYSREF detection mode is enabled on the JESD204B IP core and AD9680 for this deterministic measurement. Table 5: Deterministic Latency Test Cases Test Case Objective Description Passing Criteria DL.1 Check the FPGA SYSREF single detection. Check that the FPGA detects the first rising edge of SYSREF pulse. Read the status of sysref_singledet (bit[2]) identifier in the syncn_sysref_ ctrl register at address 0x54. The value of sysref_singledet identifier should be zero.

12 12 JESD204B IP Core and ADC Configurations AN Test Case Objective Description Passing Criteria DL.2 Check the SYSREF capture. Check that the FPGA and ADC capture SYSREF correctly and restart the LMF counter. Both the FPGA and ADC are also reset repetitively. Read the value of rbd_count (bit[10:3]) identifier in rx_status0 register at address 0x80. If the SYSREF is captured correctly and the LMF counter restarts, for every reset, the rbd_count value should only vary by two integers due to word alignment. DL.3 Check the latency from start of SYNC~ deassertion to first user data output. Check that the latency is fixed for every FPGA reset and power cycle. Record the number of link clocks from the start of SYNC~ deassertion to the first user data output, which is the assertion of jesd204_rx_link_valid signal. Consistent latency from the start of SYNC~ deassertion to the assertion of jesd204_rx_link_valid. signal. JESD204B IP Core and ADC Configurations The JESD204B IP core parameters (L, M and F) in this hardware checkout are natively supported by the AD9680 device's quick configuration register at address 0x570. The transceiver data rate, sampling clock frequency, and other JESD204B IP core parameters comply with the AD9680 operating conditions. The hardware checkout testing implements the JESD204B IP core with the following parameter configuration. Table 6: Parameter Configuration Configuration Setting LMF HD S N N CS CF ADC Device Clock

13 AN Test Results for Stratix V and Arria 10 FPGA 13 Configuration ADC Sampling Clock Setting FPGA Device Clock (6) FPGA Management Clock FPGA Frame Clock (7) or (For Arria 10) FPGA Link Clock (7) Lane Rate (Gbps) Character Replacement Data Pattern Enabled Enabled Enabled Enabled Enabled Enabled Enabled Enabled Enabled PRBS-9 Ramp (8) PRBS-9 Ramp (8) PRBS-9 Ramp (8) PRBS-9 Ramp (8) PRBS-9 Ramp (8) PRBS-9 Ramp (8) PRBS-9 Ramp (8) PRBS-9 Ramp (8) PRBS-9 Ramp (8) Test Results for Stratix V and Arria 10 FPGA Table 7: Results Definition Result PASS PASS with comments FAIL Warning Definition The Device Under Test (DUT) was observed to exhibit conformant behavior. The DUT was observed to exhibit conformant behavior. However, an additional explanation of the situation is included, such as due to time limitations only a portion of the testing was performed. The DUT was observed to exhibit non-conformant behavior. The DUT was observed to exhibit behavior that is not recommended. (6) The device clock is used to clock the transceiver. (7) The frame clock and link clock is derived from the device clock using an internal PLL. (8) The ramp pattern is used in deterministic latency measurement test cases DL.1, DL.2, and DL.3only.

14 14 Test Results for Stratix V and Arria 10 FPGA AN Result Refer to comments Definition From the observations, a valid pass or fail could not be determined. An additional explanation of the situation is included. The following table lists the results for test cases CGS.1, CGS.2, ILA.1, ILA.2, ILA.3, TL.1, and SCR.1 with different values of L, M, F, K, subclass, data rate, sampling clock, link clock, and SYSREF frequencies. Table 8: Test Results Test L M F Subclass SCR K Data rate (Mbps) Sampling Clock Link Clock Result Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass

15 AN Test Results for Stratix V and Arria 10 FPGA 15 Test L M F Subclass SCR K Data rate (Mbps) Sampling Clock Link Clock Result Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass The following table shows the Stratix V FPGA results for test cases DL.1, DL.2, and DL.3 with different values of L, M, F, K, subclass, data rate, sampling clock, link clock, and SYSREF frequencies. Table 9: Test Results For Deterministic Latency Measurement (Stratix V) Test L M F Subclass K Data rate (Mbps) Sampling Clock Link Clock Result DL Pass

16 16 Test Results for Stratix V and Arria 10 FPGA AN Test L M F Subclass K Data rate (Mbps) Sampling Clock Link Clock Result DL Pass DL Pass with comments. DL Pass DL Pass Link clock observed = with ADC LMFC offset register set to 0x00 DL Pass with comments. DL Pass DL Pass Link clock observed = 75 with ADC LMFC offset register set to 0x00 DL Pass with comments. DL Pass DL Pass Link clock observed = 115 with ADC LMFC offset register set to 0x0C DL Pass with comments. DL Pass DL Pass Link clock observed = 67 with ADC LMFC offset register set to 0x00

17 AN Test Results for Stratix V and Arria 10 FPGA 17 Test L M F Subclass K Data rate (Mbps) Sampling Clock Link Clock Result DL Pass with comments. DL Pass DL Pass Link clock observed = with ADC LMFC offset register set to 0x08 DL Pass with comments. DL Pass DL Pass Link clock observed = 195 with ADC LMFC offset register set to 0x00 DL Pass with comments. DL Pass DL Pass Link clock observed = with ADC LMFC offset register set to 0x00 DL Pass with comments. DL Pass DL Pass Link clock observed = 75 with ADC LMFC offset register set to 0x14 DL Pass with comments. Link clock observed = 115 with ADC LMFC offset register set to 0x10

18 18 Test Results for Stratix V and Arria 10 FPGA The following table shows the Arria 10 FPGA results for test cases DL.1, DL.2, and DL.3 with different values of L, M, F, K, subclass, data rate, sampling clock, link clock, and SYSREF frequencies. Table 10: Test Results For Deterministic Latency Measurement (Arria 10) AN Test L M F Subclass K Data rate (Gbps) Sampling Clock Link Clock DL PASS DL PASS Result DL PASS with comments. DL PASS DL PASS Link clock observed = 115 with ADC LMFC offset register set to 0x00. DL PASS with comments. DL PASS DL PASS Link clock observed = 195 with ADC LMFC offset register set to 0x00. DL PASS with comments. DL PASS DL PASS Link clock observed = 67 with ADC LMFC offset register set to 0x00.

19 AN Test Results for Stratix V and Arria 10 FPGA 19 Test L M F Subclass K Data rate (Gbps) Sampling Clock Link Clock Result DL PASS with comments. DL PASS DL PASS Link clock observed = 99 with ADC LMFC offset register set to 0x00. DL PASS with comments. DL PASS DL PASS Link clock observed = 115 with ADC LMFC offset register set to 0x00. DL PASS with comments. DL PASS DL PASS DL PASS Link clock observed = 67 with ADC LMFC offset register set to 0x00. DL PASS with comments. DL PASS DL PASS Link clock observed = 99 with ADC LMFC offset register set to 0x00.

20 20 Test Result Comments AN Test L M F Subclass K Data rate (Gbps) Sampling Clock Link Clock Result DL PASS with comments. DL PASS DL PASS Link clock observed = 67 with ADC LMFC offset register set to 0x00. DL PASS with comments. Link clock observed = 99 with ADC LMFC offset register set to 0x00. The following figure shows the SignalTap II waveform of the clock count from the deassertion of SYNC~ to the assertion of jesd204_rx_link_valid signal, the first output of the ramp test pattern (DL.3 test case). The clock count measures the first user data output latency. Figure 9: Deterministic Latency Measurement Ramp Test Pattern Diagram Test Result Comments In each test case, the RX JESD204B IP core successfully initialize from CGS phase, ILA phase, and until user data phase. No data integrity issue is observed by the PRBS checker. For test case with LMF=411 and

21 AN AN 710 Document Revision History , the data rate is reduced to 6250 Mbps to limit the ADC sampling rate to 1250 Msps. The following table describes the scenarios where there is a difference in the data rate. Table 11: Sample Rate Implication for Test Case with LMF=411 and 412 Item Scenario 1 Scenario 2 Remark Data rate Mbps 6250Mbps Data rate is within the operating condition of AD9680 device. Link clock = data rate/ MHz MHz Link clock frequency is determined by the data rate. ADC sample clock must be ADC maximum sampling rate 2500 Msps 1250 Msps Sample clock frequency in scenario 1 is beyond the operating condition of AD9680 device. In deterministic measurement test case DL.3, the link clock count in the FPGA depends on the board layout and the LMFC offset value set in the ADC register. The link clock count varies by only one link clock when the FPGA and ADC are reset or power cycled. The link clock variation in the deterministic latency measurement is caused by word alignment, where the control characters fall into the next cycle of data some time after realignment. This makes the duration of ILAS phase longer by one link clock some time after reset or power cycle. AN 710 Document Revision History Date Version Changes May Added Arria 10 FPGA Development Kit hardware setup, parameter configurations, and test results. July Initial release.