Add README for diot_urv_top

c5d13d4d · Tristan Gingold · a3d6e281 · c5d13d4d
Commit c5d13d4d authored Feb 20, 2020 by Tristan Gingold
Hide whitespace changes
Inline Side-by-side

Showing with 29 additions and 0 deletions

README hdl/top/diot_urv_demo/README +29 -0

No files found.
--- a/hdl/top/diot_urv_demo/README
+++ b/hdl/top/diot_urv_demo/README
+diot_urv_demo
+-------------
+
+Architecture
+------------
+
+This is a design with 2 risc-v (urv) cores.
+
+The first one is connected to the nanofip mezzanine, has a little ROM (defined
+by sw/fip_urv), a little RAM (not initialized) and several registers.
+The purpose of it is to get commands from world-fip, handle them and send a
+reply.  It also blinks the leds.
+
+The commands are very simple: read/write a word, write a block of words, or set
+the leds.
+
+The second urv is connected to the backplane.  It has a little instruction RAM
+(not initialized) and a little data RAM (also not initialized).  The
+instruction RAM can be written by the first urv core (so a program can be
+downloaded).  The reset of this core is driven by a register of the first core.
+
+The cores support neither division nor multiplication.  They aren't expected
+to support interrupts, exceptions, timers, csr.
+
+Use
+---
+
+Tool fip_urv (in sw/diot-sw/fip_urv) can be used to send commands to the
+design.
\ No newline at end of file