Delay through the GTYE4 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 the following table plus the additional line rate delay shown below.
| Block | Latency (UI) | |
|---|---|---|
| TX | 16-bit datapath cores (8b/10b) | 159 |
| 32-bit datapath cores (8b/10b) | 169 | |
| 32-bit datapath cores (64b/66b) | 190 | |
| 64-bit datapath cores (64b/66b) | 352 | |
| RX | 16-bit datapath cores (8b/10b) | 132.5 |
| 32-bit datapath cores (8b/10b) | 242.5 | |
| 32-bit datapath cores (64b/66b) | 117.5 | |
| 64-bit datapath cores (64b/66b) | 213.5 | |