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[/] [zipcpu/] [trunk/] [rtl/] [core/] [cpuops.v] - Rev 15

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15 Updated the core CPUOPS module to make certain that the carry was properly
set on right shifts. (Carry is then the last bit shifted out to the right,
and has no relation to the high order bits of the word.) Also fixed a bug
in the busdelay.v file that prevented our Quad SPI flash controller from
working. (This bug fix has not yet been tested ...) Our test.S program, the
closest thing we have to a regression test and found in the sw/zasm directory,
still successfully passes in Verilator.
dgisselq 2601d 11h /zipcpu/trunk/rtl/core/cpuops.v
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 2616d 03h /zipcpu/trunk/rtl/core/cpuops.v
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 2617d 08h /zipcpu/trunk/rtl/core/cpuops.v
2 An initial load. No promises of what works or not, but this is where the
project is at.
dgisselq 2618d 02h /zipcpu/trunk/rtl/core/cpuops.v

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