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[/] [amber/] [trunk/] [hw/] [vlog/] [amber23/] [a23_decode.v] - Rev 89


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Rev Log message Author Age Path
89 CHange registered outputs with non-zero initial values to wires with an internal register.
This works around an issue with Altera (Quartus) synthesis where any port registers are given an initial vale of zero.
csantifort 3336d 02h /amber/trunk/hw/vlog/amber23/a23_decode.v
88 Added the carry in fix added recently to the a23 core to a25 core. csantifort 3336d 03h /amber/trunk/hw/vlog/amber23/a23_decode.v
87 Added support for "When an Operand2 constant is used with the instructions MOVS, MVNS, ANDS, ORRS, ORNS, EORS, BICS, TEQ or TST, the carry flag is updated to bit[31] of the constant, if the constant is greater than 255 and can be produced by shifting an 8-bit value" to amber23 csantifort 3336d 07h /amber/trunk/hw/vlog/amber23/a23_decode.v
83 Fixed bug with carry bit - now only use the carry bit as an input to specific instruments that use it - add with carry and subtract with carry csantifort 3349d 10h /amber/trunk/hw/vlog/amber23/a23_decode.v
82 Fixed overflag bug, ldmia user regs bug and status_bits_mode set on non-ececuting command bug csantifort 3362d 22h /amber/trunk/hw/vlog/amber23/a23_decode.v
71 Original Amber 23 core uses asyncronous implementation of register bank.
It leads to some problems with ram-based implementation of the register bank,
because at least Altera FPGAs uses syncronous ram blocks, so the whole address
needs to be latched.

The patch exposes non-registered versions of register select signals to the
register bank, so the bank can build address and latch it in the syncronous
ram input register.

The patch is a pre-requisite for ram-based register bank implementation on Altera FPGA.

Contributed by Dmitry Tarnyagin <>
csantifort 4049d 05h /amber/trunk/hw/vlog/amber23/a23_decode.v
63 Add support for Xilinx ISim Verilog simulator.
Remove Virtex-6 files.
csantifort 4049d 11h /amber/trunk/hw/vlog/amber23/a23_decode.v
15 Copied amber to amber23, Many system changes to support new amber25 core. csantifort 4848d 18h /amber/trunk/hw/vlog/amber23/a23_decode.v
2 Baseline release of the Amber 2 core csantifort 4879d 05h /amber/trunk/hw/vlog/amber/a23_decode.v

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