Maximum Frame Length and Jumbo Frames - 7.2 English

AXI 1G/2.5G Ethernet Subsystem Product Guide (PG138)

Document ID
PG138
Release Date
2023-11-15
Version
7.2 English

The maximum length of a frame specified in the IEEE Std 802.3-2008 specification is 1,518 bytes for non-VLAN tagged frames. VLAN tagged frames can be extended to 1,522 bytes. When jumbo frame handling is disabled (RCW1 register bit 30 Table 1) and a received frame exceeds the maximum legal length, the frame is dropped and a Receive Reject interrupt is activated (see bit 3 in Interrupt Status Register). When jumbo frame handling is enabled, frames longer then the legal maximum are received in the same way as shorter frames. Jumbo frames are restricted by the AXI Ethernet design to less than 16 KB.