URL https://opencores.org/ocsvn/mcs-4/mcs-4/trunk

Subversion Repositories mcs-4

[/] [mcs-4/] [trunk/] [rtl/] [verilog/] [i4004/] [timing_io_tb.v] - Rev 6

Rev	Log message	Author	Age	Path
6	Massive update of all MCS-4 components This commit updates all the previous i4004 CPU modules to address various bugs that were found during testing. At this point, all CPU functions appear to operate correctly. No FPGA-specific features are required by the i4004 CPU implementation. This commit also provides implementations of the 4001 ROM, 4002 RAM, and 4003 Shift Register chips, thus allowing a functional MCS-4 system to be implemented. Some of these modules are dependent on features found in the Xilinx Spartan FPGA, such as Block RAM and dual-port Distributed RAM, though alternate implementations are possible for other FPGAs. These modules have been used (along with keyboard and printer emulation modules not provided here) to implement a complete Busicom 141-PF calculator clone using a Xilinx Spartan 6 FPGA and a custom PCB. All functions of the Busicom 141-PF calculator appear to function normally.	rrpollack	1072d 09h	/mcs-4/trunk/rtl/verilog/i4004/timing_io_tb.v