The sys_w11a_b3 system is a w11a implementation for the Digilent Basys 3 board. The w11 memory is based on BRAMs only because the board doesn't feature any memory outside the FPGA.
For complete configuration, see sys_conf.vhd. The most important features are:
| Property | Value |
|---|---|
| CPU options | FPP: no; Cache: 8 kB |
| Memory | 176 kB from BRAMs via pdp11_bram_memctl |
| Devices | DL11:2; DZ11, PC11, LP11, DEUNA, RK11, RL11, RHRP, TM11, IIST, KW11P, M9312: yes |
| Diagnostics | rbmon: no; ibmon: no; dmpcnt: yes; dmhbpt: 2; dmcmon: no |
| Rlink | 12 Mbps via FT2232HQ based serial link |
The board has 16 LEDs and allows a nice console light emulation. The memory size of 176 kB allows starting a few oskits. u5ed works fine. XXDP, RT11 and RSX-11M should work. 211bsd will not boot, neither most RSX-11M+ systems.
For complete instructions on how to run operating system images, see w11a_os_guide. The default setup is:
SWI = 00000000 00101000 (gives console light display on LEDS)
ti_w11 -tuD,12M,break,xon @<oskit-name>_boot.tcl
The Basys 3 board is one of the w11 development platforms. The sys_w11a_b3 design is regularly FPGA tested with ostest against the oskits running with 176 kB memory.
- 2015-02-08: initial version.