B.1. CoreSight components and clock domains

Table B.1 shows the components and clock domains.

Table B.1. CoreSight components and clock domains

CoreSight componentClock domainsComments
Debug Access Port (DAP)
SWJ-DPDAPCLKDebug Access Port clock. Always equivalent to PCLKDBG.
SWCLKTCKJTAG-DP and SW-DP external interface.
JTAG-APDAPCLKDebug Access Port clock. Always equivalent to PCLKDBG.
AHB-APDAPCLKDebug Access Port clock. Always equivalent to PCLKDBG.
HCLKSystem AHB clock.
APB-APDAPCLK

Debug Access Port clock. Always equivalent to PCLKDBG.

APB-AP requires DAPCLK = PCLKDBG.

PCLKDBGCoreSight Debug APB clock.
APB-MuxPCLKSYSSystem bus clock, HCLK for example.
 PCLKDBGCoreSight Debug APB clock.
ROM table--
Embedded Cross Trigger
CTICTICLKCross Trigger Interface clock.
PCLKDBGCoreSight Debug APB clock.
CTMCTMCLKCross Trigger Matrix clock.
CoreSight Sources
AHB Trace Macrocell (HTM)

Separate documentation, see Further reading.

HTMCLK

PCLKDBGCoreSight Debug APB clock.
ATCLKAMBA trace bus clock.

ETMs for processor trace:

CoreSight ETM9

CoreSight ETM11

Separate documentation, see Further reading.

ETMCLK

PCLKDBGCoreSight Debug APB clock.
ATCLKAMBA trace bus clock.
One-to-one ATB bridgeATCLKAMBA trace bus clock.
ReplicatorATCLKAMBA trace bus clock.
Trace Funnel ATCLKAlways synchronous, and greater than or equal to PCLKDBG.
PCLKDBGCoreSight Debug APB clock.
Trace Port Interface UnitPCLKDBGCoreSight Debug APB clock.
ATCLKAlways synchronous, and greater than or equal to PCLKDBG.
TRACECLKINCoreSight Trace Port Interface Unit off-chip trace data clock.
Embedded Trace BufferPCLKDBGCoreSight Debug APB clock.
ATCLK

CoreSight AMBA Trace Bus clock.

Always synchronous, and greater than or equal to PCLKDBG.

Instrumentation Trace MacrocellPCLKDBGCoreSight debug APB clock
ATCLKCoreSight AMBA Trace Bus clock. Always synchronous and greater than or equal to PCLKDBG.
Serial Wire OutputPCLKDBGCoreSight debug APB clock
ATCLKCoreSight AMBA Trace Bus clock. Always synchronous and greater than or equal to PCLKDBG.
TRACECLKINSerial Wire trace port data clock.

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