jtag_apb

Files
file	jtag_apb.cdl
	JTAG tap client to APB master module.

Detailed Description

Modules

module jtag_apb::jtag_apb	(	clock	jtag_tck,
		input bit	reset_n,
		input bit	ir[5],
		input t_jtag_action	dr_action,
		input	bitdr_in[50],
		output	bitdr_tdi_mask[50],
		output	bitdr_out[50],
		clock	apb_clock,
		output t_apb_request	apb_request,
		input t_apb_response	apb_response
	)

JTAG client module that presents an APB master interface

Parameters

[in]	jtag_tck	JTAG TCK signal, used as a clock
[in]	reset_n	Reset that drives all the logic
[in]	ir	JTAG IR which is to be matched against t_jtag_addr
[in]	dr_action	Action to perform with DR (capture or update, else ignore)
[in]	bitdr_in	Data register in; used in update, replaced by dr_out in capture, shift
[out]	bitdr_tdi_mask	One-hot mask indicating which DR bit TDI should replace (depends on IR)
[out]	bitdr_out	Data register out; same as data register in, except during capture when it is replaced by correct data dependent on IR, or shift when it goes right by one
[in]	apb_clock	APB clock signal, asynchronous to JTAG TCK
[out]	apb_request	APB request out
[in]	apb_response	APB response