Sustained frame reception refers to the maximum size of frames which can be continuously received when each frame is separated by a minimum interframe gap.
The size of frames that can be reliably received is dependent on the two considerations previously introduced in this appendix:
- The size of the elastic buffer, see Receive Elastic Buffers: Depths and Maximum Frame Sizes.
-
The number of clock correction characters present in a minimum interframe gap,
(see Clock Correction).
Maximum Frame Sizes for Sustained Frame summarizes the maximum frame sizes for sustained frame reception when used with the different receive elastic buffers provided with the core. All frame sizes are provided in bytes.
| Ethernet Standard and Speed | Receive Elastic Buffer Type | ||
|---|---|---|---|
| TBI | Device Specific Transceiver | SGMII FPGA Logic Buffer(optional for use with device-specific transceivers) | |
| 1000BASE-X (1 Gbps) | 20000 (limited by clock correction) | 20000 (limited by clock correction) | 20000 (limited by clock correction) |
| SGMII 1 Gbps | 20000 (limited by clock correction) | 20000 (limited by clock correction) | 20000 (limited by clock correction) |
| SGMII 100 Mbps | 20000 (limited by clock correction) | 9000 (limited by buffer size) | 20000 (limited by clock correction) |
| SGMII 10 Mbps | 2800 (limited by buffer size) | 900 (limited by buffer size) | 2800 (limited by buffer size) |