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[/] [zipcpu/] [trunk/] [rtl/] - Rev 13

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12 Bunch of changes while trying to get a hello world program:
1. Right shifts by 32 or more now result in zero, or all of the top bit in the
case of ASRs.
2. zdump now properly includes addresses with dumped lines.
3. zparser now properly handles immediate values via the .DAT instruction.		 dgisselq 3391d 11h /zipcpu/trunk/rtl/
11 This version works on an FPGA!!!

(Or at least the wdt.S program passes ...)		 dgisselq 3391d 19h /zipcpu/trunk/rtl/
9 This checkin is the result of a watchdog timer test, and everything it took
to get the watchdog timer working. The timer function was simplified,
although it now uses a touch more resources--being able to count down 31
bits instead of 30. The parser was modified, since it couldn't handle
storing to register plus offsets like it was supposed to be able to. The
testbench, zippy_tb, was modified to accept an assembled machine code file
such as I might place on a board to test it.

Lots of work to get it working.

Looking at the files below, it looks like I'll need a second check in to check
in the watchdog timer test itself.		 dgisselq 3392d 09h /zipcpu/trunk/rtl/
3 Rebuilt the pipefetch (instruction fetch/cache module) so that it will
let go of the bus if the memory unit wants it to execute an instruction.
Pipefetch will then grab the bus back whtn the memory unit is done, so things
otherwise continue as they were before.

Other tweaks were made to try to reduce code complexity.		 dgisselq 3392d 16h /zipcpu/trunk/rtl/
2 An initial load. No promises of what works or not, but this is where the
project is at.		 dgisselq 3393d 09h /zipcpu/trunk/rtl/

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