Cortex™-A8 Technical Reference ManualRevision: r2p2
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A.2. ATB interface

Table A.2 shows the signals of the ATB interface.

Table A.2. ATB interface

SignalI/OResetDescription
AFREADYMOb0

Buffer ready for new data:

0 = buffer flush not complete

1 = buffer flush complete.

AFVALIDMI-

Flush request:

0 = no ETM data flush request

1 = ETM data flush request.

ATBYTESM[1:0]Ob00

Size of data:

b00 = 1 byte

b01 = 2 bytes

b10 = 3 bytes

b11 = 4 bytes.

ATCLKI-ATB clock.
ATCLKENI-

ATB clock enable:

0 = clock not enabled

1 = clock enabled.

ATDATAM[31:0]O0x00000000ATB data bus.
ATIDM[6:0]Ob0000000Identification tag of current trace source.
ATREADYMI-

ATB device ready. Previous data accepted:

0 = not ready

1 = ready.

ATRESETnI-ATB reset input.
ATVALIDMOb0

ATB valid data:

0 = no valid data

1 = valid data.

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