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Notes on w11 systems: w11a for Arty A7-35

Basics

The sys_w11a_arty system is a w11a implementation for the Digilent Arty A7-35 board with DDR3 SDRAM support via a Vivado MIG core. For complete configuration, see sys_conf.vhd. The most important features are:

Property Value
CPU options FPP: no; Cache: 32 kB
Memory 3840 kB from DDR3 SDRAM via miglib_arty
Devices DL11:2; DZ11, PC11, LP11, DEUNA, RK11, RL11, RHRP, TM11, IIST, KW11P, M9312: yes
Diagnostics rbmon: yes; ibmon: yes; dmpcnt: yes; dmhbpt: 2; dmcmon: yes
Rlink 12 Mbps via FT2232HQ based serial link

An alternative design that uses only BRAM is available as sys_w11a_br_arty.

Usage

The board has only 4 LEDs plus 4 RGB-LEDS and offers only a compactified console light emulation. The memory size of 3840 kB allows starting all oskits.

For complete instructions on how to run operating system images, see w11a_os_guide. The default setup is:

  SWI = 0110                (gives console light emulation...)
  ti_w11 -tuD,12M,break,xon  @<oskit-name>_boot.tcl

Status & History

The Arty A7-35 board is one of the main w11 development platforms. The sys_w11a_arty design is often FPGA tested with ostest against all oskits.

  • 2019-06-05: reduce clock to 72 MHz, Vivado 2919.1 fails with 75 MHz
  • 2019-01-27: reduce clock to 75 MHz, Vivado 2918.3 fails with 80 MHz
  • 2018-11-18: initial version, runs with 80 MHz using Vivado 2017.4
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