Signal Descriptions
ARM DDI 0301H Copyright © 2004-2009 ARM Limited. All rights reserved. A-14
ID012310 Non-Confidential, Unrestricted Access
A.7 Debug interface signals, including JTAG
Table A-12 lists the debug interface signals including JTAG.
Table A-12 Debug interface signals
Name Direction Description
TCK Input Debug clock.
RTCK Output Returned TCK.
JTAGSYNCBYPASS Input Bypass enable of JTAG synchronizers.
DBGTCKEN Output Debug clock enable.
DBGnTRST Input Debug nTRST.
TDI Input JTAG TDI.
TMS Input JTAG TMS.
DBGTDI Output Synchronized TDI.
DBGTMS Output Synchronized TMS.
EDBGRQ Input External debug request.
DBGEN Input Debug enable.
DBGVERSION[3:0] Input JTAG ID Version field. See Device ID code register
on page 14-8.
DBGMANID[10:0] Input JTAG manufacturer ID field. See Device ID code
register on page 14-8.
DBGTDO Output Debug TDO.
DBGnTDOEN Output Debug nTDOEN.
COMMTX Output Comms channel transmit.
COMMRX Output Comms channel receive.
DBGACK Output Debug acknowledge.
DBGNOPWRDWN Output Debugger has requested core is not powered down.
SPIDEN Input Secure Privileged Invasive Debug Enable.
SPNIDEN Input Secure Privileged Non-Invasive Debug Enable.
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