Files
file	bbc_micro.cdl
	BBC microcomputer implementation module.

Detailed Description

Modules

module bbc_micro::bbc_micro	(	clock	clk,
		input t_bbc_clock_control	clock_control,
		output t_bbc_clock_status	clock_status,
		input bit	reset_n,
		input t_bbc_keyboard	keyboard,
		output t_bbc_display	display,
		output bit	keyboard_reset_n,
		output t_bbc_floppy_op	floppy_op,
		input t_bbc_floppy_response	floppy_response,
		input t_bbc_micro_sram_request	host_sram_request,
		output t_bbc_micro_sram_response	host_sram_response
	)

Clock that mirrors 2MHz falling - video data from RAM is valid at this edge, so used by CRTC, SAA5050 latches, SAA5050, vidproc

Clock that mirrors 1MHzE rising - 1MHz system clock - used by keyboard and SAA5050

Clock that mirrors 1MHzE falling, end of 1MHz CPU bus cycle, used by 6522, 6850, 6845, some latches

6502 clock, >=2MHz but extended when accessing 1MHz peripherals

Parameters

[in] clk Clock at least at '4MHz' - CPU runs at least half of this