[原创]FPGA JTAG工具设计(一)

先来看不同JTAG方案，下载配置QSPI Flash所耗时间

基于FTDI方案，JTAG下载时间为494sec

 JTAG chain configuration
 --------------------------------------------------
 Device   ID Code         IR Length     Part Name
          4ba00477                    arm_dap
                              xc7z020
 --------------------------------------------------
 Enabling extended memory access checks for Zynq.
 Writes to reserved memory are not permitted and reads return .
 To disable this feature, run "debugconfig -memory_access_check disable".
 --------------------------------------------------
 CortexA9 Processor Configuration
 -------------------------------------
 Version.............................0x00000003
 User ID.............................0x00000000
 No of PC Breakpoints................
 No of Addr/Data Watchpoints.........
 Processor Reset .... DONE
 SF: Detected S25FL256S_64K with page size  Bytes, erase size  KiB, total  MiB
 Performing Erase Operation...
 Erase Operation successful.
 INFO: [Xicom -] Elapsed time =  sec.
 Performing Program Operation...
 %.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%
 .........Program Operation successful.
 INFO: [Xicom -] Elapsed time =  sec.
 Flash Operation Successful

基于Cypress方案，JTAG下载时间为674sec

 JTAG chain configuration
 --------------------------------------------------
 Device   ID Code         IR Length     Part Name
          4ba00477                    arm_dap
                              xc7z020
 --------------------------------------------------
 Enabling extended memory access checks for Zynq.
 Writes to reserved memory are not permitted and reads return .
 To disable this feature, run "debugconfig -memory_access_check disable".
 --------------------------------------------------
 CortexA9 Processor Configuration
 -------------------------------------
 Version.............................0x00000003
 User ID.............................0x00000000
 No of PC Breakpoints................
 No of Addr/Data Watchpoints.........
 Processor Reset .... DONE
 SF: Detected S25FL256S_64K with page size  Bytes, erase size  KiB, total  MiB
 Performing Erase Operation...
 Erase Operation successful.
 INFO: [Xicom -] Elapsed time =  sec.
 Performing Program Operation...
 %.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%............................................................................................................................................................................%
 ...Program Operation successful.
 INFO: [Xicom -] Elapsed time =  sec.
 Flash Operation Successful

详细的烧写过程：FTDI方案，TotalTime=1455sec，24.25分钟；采用Cypress方案需要42分钟

 cmd /C program_flash -f \
 F:\*\bootimage\BOOT.bin \
 -offset  -flash_type qspi_single -blank_check -verify -cable type xilinx_tcf url \
 TCP:127.0.0.1:
 ****** Xilinx Program Flash
 ****** Program Flash v2015. (-bit)
   **** SW Build  on Wed Nov  :: MST
     ** Copyright - Xilinx, Inc. All Rights Reserved.
 Connecting to hw_server @ TCP:127.0.0.1:
 Connected to hw_server @ TCP:127.0.0.1:
 Available targets and devices:
 Target  : jsn-JTAG-SMT1-210203367162A
      Device : jsn-JTAG-SMT1-210203367162A-4ba00477-
 JTAG chain configuration
 --------------------------------------------------
 Device   ID Code         IR Length     Part Name
          4ba00477                    arm_dap
                              xc7z020
 --------------------------------------------------
 Enabling extended memory access checks for Zynq.
 Writes to reserved memory are not permitted and reads return .
 To disable this feature, run "debugconfig -memory_access_check disable".
 --------------------------------------------------
 CortexA9 Processor Configuration
 -------------------------------------
 Version.............................0x00000003
 User ID.............................0x00000000
 No of PC Breakpoints................
 No of Addr/Data Watchpoints.........
 Processor Reset .... DONE
 SF: Detected S25FL256S_64K with page size  Bytes, erase size  KiB, total  MiB
 Performing Erase Operation...
 Erase Operation successful.
 INFO: [Xicom -] Elapsed time =  sec.
 Performing Blank Check Operation...
 %.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%
 ..........INFO: [Xicom -] Elapsed time =  sec.
 Blank Check Operation successful. The part is blank.
 Performing Program Operation...
 %.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%.........................................................................................................................................................................................%
 .........Program Operation successful.
 INFO: [Xicom -] Elapsed time =  sec.
 Performing Verify Operation...
 %.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%.......................................................................................................................................................................................................%
 ..........INFO: [Xicom -] Elapsed time =  sec.
 Verify Operation successful.
 Flash Operation Successful

在实际调试过程中，下载速度快也能为开发人员节约时间

基于此，根据相关资料DIY一个JTAG+UART方案，在调试zynq时，很多时候板级并没有UART 外置PHY，JTAG工具链自带UART，也方便FPGA和嵌入式工程师调试单板和系统。