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R
Appendix E: Rx Elastic Buffer Specifications
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RocketIO Transceiver |
| RocketIO Transceiver |
Rx Elastic Buffer |
| Rx Elastic Buffer |
|
|
|
52 - Overflow Mark
57 - Overflow Mark
CLK_COR_MAX_LAT + 2
64
34
30
64
CLK_COR_MIN_LAT - 2
16 - Underflow Mark
12 - Underflow Mark
Figure E-1: Elastic Buffer Sizes for all RocketIO Transceiver Families
Virtex-II Pro and Virtex-5 Devices
Consider the
•If the buffer is filling during frame reception, there are
•If the buffer is emptying during reception, then there are
This analysis assumes that the buffer is approximately at the
Because there is a
5000 x 18 = 90000 bytes
Table
Table
Standard / Speed | Maximum Frame Size |
90000 | |
SGMII (1 Gbps) | 90000 |
SGMII (100 Mbps) | 9000 |
SGMII (10 Mbps) | 900 |
220 | www.xilinx.com | Ethernet |
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| UG155 March 24, 2008 |