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Notes on w11 systems: w11a for and Nexys 3


The sys_w11a_n3 system is a w11a implementation for the Digilent Nexys 3 board. For complete configuration, see sys_conf.vhd. The most important features are:

Property Value
CPU options FPP: no; Cache: 8 kB
Memory 3840 kB from PSRAM via nx_cram_memctl_as
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 USB 2 speed over Cypress FX2


The board has 8 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 = 00101100
  ti_w11 -u @<oskit-name>_boot.tcl

Status & History

The Nexys 3 board was the main w11 development platforms until the Nexys 4 board arrived and development moved from ISE to Vivado. Together with the Nexys 2 board, it still has the best I/O performance thanks to the USB 2 speed and low-latency rlink connection. The sys_w11a_n3 design is occasionally FPGA tested with ostest against all oskits.

  • 2011-11-20: initial version