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A.1.7. Timestamp port signals

This is the interface where the STM receives timestamp information from the system. Table A.7 shows the timestamp port signals.

Table A.7. Timestamp port signals
Signal nameTypeDescription

Timestamp value.

This port is always 64 bits wide. If TSMAXWIDTH is b0, bits [63:48] of the timestamp are ignored.


Timestamp encoding. Tie this to a value appropriate to the system timestamp encoding.


b0 = Reflected binary gray-code timestamp encoding

b1 = Natural binary timestamp encoding.


Maximum timestamp width in STM timestamp packets. This should be tied by the system designer to a value appropriate to the system timestamp counter width.


b0 = 48-bit maximum timestamp width

b1 = 64-bit maximum timestamp width.

If the actual width of the timestamp input to the STM is less than the selected maximum, the remaining upper bits must be tied to zero and not left undriven.

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