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HI,
8085 is not a Soft Processor. It is a Hard Core CPU. Infact the Soft Core CPUs are FPGAs (Field Programmable Gate Arrays). The logic in here is controlled by software command hence changing the Gate Arrays according to the circuit requirement (ultimately performing a CPU withing the arrays). Where as the Hard core CPUs are burnt on the chip as permanent gate circuitry. (just a brief description)
HI,
8085 is not a Soft Processor. It is a Hard Core CPU. Infact the Soft Core CPUs are FPGAs (Field Programmable Gate Arrays). The logic in here is controlled by software command hence changing the Gate Arrays according to the circuit requirement (ultimately performing a CPU withing the arrays). Where as the Hard core CPUs are burnt on the chip as permanent gate circuitry. (just a brief description)
Thanks it helped!
I am wondering if I have Spartan-6 FPGA board then can I program it for any processor(like 8085 and 8086) or there are limitation that 'ONLY SOFT PROCESSORS' can be implemented on it!
A soft processor is not a type of processor, it a type of processor implementation.
A soft processor describes a processor when it is implemented in a reprogrammable logic chip (almost always an FPGA or CPLD).
If you put the same processor into an ASIC or bought it as a commercial chip, it is a hard processor. But this term 'hard processor' didn't exist and wasn't needed until programmable logic came along and made soft processors possible for the masses. We might as well start calling other circuits in the FPGA soft, like a 'soft DMA controller' or 'soft SDRAM controller', everything in an FPGA/CPLD is in the same bracket really.
So any CPU (8085, Z80, 68000) can have a soft implementation of itself for an FPGA/CPLD, if you've got a large enough etc such device to accomodate it. The soft/hard bit is nothing to do with the processor's architecture or programming model - an 8085 is still just an 8085.
Have a look on opencores.org, loads of them on there.
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