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[/] [zipcpu/] [trunk/] [rtl/] [cpudefs.v] - Rev 181

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Rev	Log message	Author	Age	Path
138	This updates the CPU multiply instruction into a set of three instructions. MPY is a 32x32-bit multiply instruction, returning the low 32-bit result, MPYUHI returns the upper 32-bits assuming the result was unsigned and MPYSHI returns the upper 32-bits assuming the result was signed.	dgisselq	3131d 05h	/zipcpu/trunk/rtl/cpudefs.v
84	Minor updates.	dgisselq	3255d 20h	/zipcpu/trunk/rtl/cpudefs.v
71	This contains a bunch of bug fixes. (A lot ...) For example, the pipeline stall code has also seriously changed, to fixed the pipeline memory load/op stage conflict, while maintaining no-stall operation for operands that don't need an offset. This had a cascading effect, however, so that the multiply could no longer complete in a single cycle. Therefore, the timing on the multiplies was slowed down to two cycles from a single cycle. (It's the only two-cycle ALU operation ...) The illegal instruction code has also been fixed, so that illegal instructions no longer stalls the prefetch bus.	dgisselq	3260d 23h	/zipcpu/trunk/rtl/cpudefs.v
69	This implements the "new Instruction Set" architecture for the Zip CPU. It's a massive change set, that touches just about everything but probably not enough of everything. Please see the spec.pdf for a description of this new architecture.	dgisselq	3267d 04h	/zipcpu/trunk/rtl/cpudefs.v
64	Shuffled some comments into here from elsewhere.	dgisselq	3328d 04h	/zipcpu/trunk/rtl/cpudefs.v
56	Here's a bit of work in progress for getting the Zip CPU working on a XuLA2 board. Many changes include: the existence of a cpudefs.v file to control what "options" are included in the ZipCPU build. This allows build control to be separated from the project directory (one build for a XuLA2 board, another for a Basys-3 development board). Other changes have made things perhaps harder to read, but they get rid of warnings from XST. A big change was the addition of the (* ram_style="distributed" *) comment for the register set. This was necessary to keep XST from inferring a block RAM and breaking the logic that was supposed to take place between a register read and when it was used.	dgisselq	3338d 07h	/zipcpu/trunk/rtl/cpudefs.v

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