For any request that includes an associated payload, the user application can abort the request at any time during the transfer of the payload by asserting the discontinue signal in the s_axis_rq_tuser bus. The integrated block nullifies the corresponding TLP on the link to avoid data corruption.
The user application can assert this signal in any cycle during the transfer, when the request being transferred has an associated payload. The user application can either choose to terminate the packet prematurely in the cycle where the error was signaled (by asserting s_axis_rq_tlast ), or can continue until all bytes of the payload are delivered to the integrated block. In the latter case, the integrated block treats the error as sticky for the following beats of the packet, even if the user application deasserts the discontinue signal before reaching the end of the packet.
The discontinue signal can be asserted only when s_axis_rq_tvalid is active-High. The integrated block samples this signal when s_axis_rq_tvalid and s_axis_rq_tready are both active-High. Thus, after assertion, the discontinue signal should not be deasserted until s_axis_rq_tready is active-High.
When the integrated block is configured as an Endpoint, this error is reported by the integrated block to the Root Complex it is attached to, as an Uncorrectable Internal Error using the Advanced Error Reporting (AER) mechanisms.