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Lattice Semiconductor
10Gb Ethernet XGXS IP Core User’s Guide
Packet Generator and Checker
The XGXS IP includes packet generator and checker capabilities supporting the CRPAT and CJPAT test patterns
speci ? ed in IEEE 803.2ae. These capabilities may be utilized in place of the external XGMII interface and are pro-
vided to support system debugging and/or interoperability testing.
The generator/checker blocks have the following programmable features controllable via the MDIO interface:
? Enable test pattern transmission (versus XGMII data transmission).
? Select CRPAT or CJPAT.
? Transmit continuous packets or a speci ? c number of packets.
? Program the number of packets to be sent in non-continuous mode.
? Program the number of additional idle bytes to be sent during the IPG.
16-bit registers are also implemented which provide counts of:
? Packets transmitted by the generator.
? Packets received by the checker.
? Errored packets received.
The numbers of packets transmitted and received are determined by counting packet Start control bytes. Errored
packets are detected by checking the packet CRC. These registers are accessible via the MDIO.
Continuous Random Test Pattern (CRPAT)
The purpose of the CRPAT capability is to provide a data pattern that has broad spectral content and minimal peak-
ing that can be used for the measurement of jitter. This pattern consists of a continuous stream of identical packets
separated by a minimum IPG. Each packet within this pattern consists of eight bytes of PREAMBLE/SFD followed
by 1488 data bytes followed by four octets of CRC and 12 octets of IPG. The speci ? c pattern is as follows:
Start/Preamble/SFD:
FB 55 55 55 55 55 55 D5
Data bytes:
BE (repeat for 4 bytes)
D7 (repeat for 4 bytes)
23 (repeat for 4 bytes)
47 (repeat for 4 bytes)
6B (repeat for 4 bytes)
8F (repeat for 4 bytes)
B3 (repeat for 4 bytes)
14 (repeat for 4 bytes)
5E (repeat for 4 bytes)
FB (repeat for 4 bytes)
35 (repeat for 4 bytes)
59 (repeat for 4 bytes)
(repeat data byte pattern 31 times)
CRC :
F8 79 05 59
IPG :
FD 07 07 07 07 07 07 07 07 07 07 07
11
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