67437bf140
- Makefile: drop ISE targets except for w11a - rtl/sys_gen/**/*.*mfset: accomodate recent changes - rtl/w11a - pdp11_dpath.vhd: remove PCOUT port - pdp11_sequencer.vhd: remove PC port
Notes on w11 systems: w11a for and Nexys 2
Basics
The sys_w11a_n2 system is a w11a implementation for the Digilent Nexys 2 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 |
Usage
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 2 board was, along with the Nexys 3 board, the main w11 development platforms until the Nexys 4 board arrived and development moved from ISE to Vivado. Together with the Nexys 3 board, it still has the best I/O performance thanks to the USB 2 speed and low-latency rlink connection. The sys_w11a_n2 design is occasionally FPGA tested with ostest against all oskits.
- 2010-05-28: initial version