jtag_tap

Files
file	jtag_tap.cdl
	JTAG tap controller module.

Detailed Description

Modules

module jtag_tap::jtag_tap	(	clock	jtag_tck,
		input bit	reset_n,
		input t_jtag	jtag,
		output bit	tdo,
		output bit	ir[ir_length],
		output t_jtag_action	dr_action,
		output bit	dr_in[dr_length],
		input bit	dr_tdi_mask[dr_length],
		input bit	dr_out[dr_length]
	)

JTAG TAP controller module that basically implements the JTAG state machine, holds an IR, and interacts with a client to capture and update data.

Parameters

[in]	jtag_tck	JTAG TCK
[in]	reset_n	Reste for all the logic
[in]	jtag	JTAG inputs
[out]	tdo	JTAG TDO pin
[out]	ir	IR register to be used by client
[out]	dr_action	DR action (capture, update, shift, or none)
[out]	dr_in	DR to be fed to client
[in]	dr_tdi_mask	One-hot mask indicating where TDI should be inserted (based on DR length, based on IR)
[in]	dr_out	DR from client (from client data if capture, shifted if shift)