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ADDR = 0x1EF: Receive Minimum Frame Size
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Bit name RX_MIN RX_MIN_SIZE[6:0]
ENFORCE
R/W R/W R/W
Value 0 0x40
after
reset
Bit 7: RX_MIN_ENFORCE enables the enforcing of a minimum frame size. When high, frames with
fewer bytes are discarded. When low, no minimum frame size is enforced.
Bits 6-0: RX_MIN_SIZE [6:0] specifies the minimum Ethernet frame size allowed in bytes. Frames with a
payload (preamble and SFD excluded) smaller than this value are discarded.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Bit name RX_MAX_SIZE [7:0]
R/W R/W
Value 0xF2
after
reset
ADDR = 0x1F0: Receive Maximum Frame Size LSB
Bits 7-0: RX_MAX_SIZE specifies the maximum Ethernet frame size allowed in bytes. Frames with a
payload (preamble and SFD excluded) larger than this value are discarded.
ADDR = 0x1F1: Receive Maximum Frame Size MSB
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Bit name RX_MAX_ RX_MAX_SIZE [14:8]
ENFORCE
R/W R/W R/W
Value 0 0x05
after
reset
Bit 7: RX_MAX_ENFORCE enables the enforcing of a maximum frame size. When high, frames with
more bytes are discarded. When low, no maximum frame size is enforced.
Bits 6-0: RX_MAX_SIZE [14:8] is the MSB of the register above.