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[/] [amber/] [trunk/] [hw/] [vlog/] [amber25/] [a25_execute.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 3514d 16h /amber/trunk/hw/vlog/amber25/a25_execute.v
88 Added the carry in fix added recently to the a23 core to a25 core. csantifort 3514d 16h /amber/trunk/hw/vlog/amber25/a25_execute.v
86 Fixed bug in amber 25 where a read was taken from user mode register in subervisor mode immediately following a ldm to user mode registers csantifort 3527d 16h /amber/trunk/hw/vlog/amber25/a25_execute.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 3528d 00h /amber/trunk/hw/vlog/amber25/a25_execute.v
82 Fixed overflag bug, ldmia user regs bug and status_bits_mode set on non-ececuting command bug csantifort 3541d 12h /amber/trunk/hw/vlog/amber25/a25_execute.v
54 Bug fix for bug reported by Botao Lee. The mode bits in the decode stage did not change immediately
after a mode switch from a teqp instruction, but 1 cycle later. This meant the wrong set of registers
was selected for writing to for 1 clock cycle.		 csantifort 4819d 15h /amber/trunk/hw/vlog/amber25/a25_execute.v
53 Cleaned up Amber Verilog, removing unused signals. csantifort 4834d 13h /amber/trunk/hw/vlog/amber25/a25_execute.v
35 Amber25 improvements:
Use 128-bit wishbone bus, instead of 32-bit to reduce cache miss fetch times
Use a fast barrel shifter for shifts between 0 and 4 to improve timing
Use a 2 cycle full barrel shifter for complex shifts		 csantifort 4935d 20h /amber/trunk/hw/vlog/amber25/a25_execute.v
20 Added feature to A25 core to directly use a read value from the write back stage
to reduce the stall to 1 cycle when there is a register conflict with the
following instruction. This increases performance by about 3%.		 csantifort 5020d 19h /amber/trunk/hw/vlog/amber25/a25_execute.v
16 Deleted the old version of the 3-state amber core. Its replaced with amber23.
Added the 5-state Amber core.		 csantifort 5027d 08h /amber/trunk/hw/vlog/amber25/a25_execute.v

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