Intel® Stratix® 10 Hard Processor System Technical Reference Manual

ID 683222
Date 11/28/2022
Public

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17.6.3.2.5. Receive Descriptor Fields (RDES6) and (RDES7)

Receive Descriptor Fields 6 and 7 (RDES6 and RDES7) contain the snapshot of the timestamp. The availability of the snapshot of the timestamp in RDES6 and RDES7 is indicated by Bit 7 in the RDES0 descriptor.

Receive Descriptor Field 6 (RDES6)

Table 181.  Receive Descriptor Field 6 (RDES6)

Bit

Description

31:0

RTSL: Receive Frame Timestamp Low

This field is updated by the DMA with the least significant 32 bits of the timestamp captured for the corresponding receive frame. This field is updated by the DMA only for the last descriptor of the receive frame, which is indicated by Last Descriptor status bit (RDES0[8]) in RDES0. 

Receive Descriptor Field 7 (RDES7)

Table 182.  Receive Descriptor Field 7 (RDES7)

Bit

Description

31:0

RTSH: Receive Frame Timestamp High

This field is updated by the DMA with the most significant 32 bits of the timestamp captured for the corresponding receive frame. This field is updated by the DMA only for the last descriptor of the receive frame, which is indicated by Last Descriptor status bit (RDES0[8]) in RDES0.