Delay through the GTHE4 transceiver consists of a variable component (barrel shift or TX and RX gearbox latency) and a fixed component. The fixed component is made up of the delay shown in
Table: Fixed Contribution to Delay - GTHE4 Transceiver
plus the additional line rate delay shown below.
Table 4-12:
Fixed Contribution to Delay - GTHE4 Transceiver
|
Block
|
Latency (UI)
|
|
TX
|
16-bit datapath cores (8b/10b)
|
85
|
|
32-bit datapath cores (8b/10b)
|
155
|
|
64-bit datapath cores (64b/66b)
|
176
|
|
RX
|
16-bit datapath cores (8b/10b)
|
134.5
|
|
32-bit datapath cores (8b/10b)
|
248.5
|
|
64-bit datapath cores (64b/66b)
|
125.5
|