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187
Ethernet Module
Maximum Frame register
Address: FF80 0414
Register bit assignment
Bits Access Mnemonic Reset Description
D31:16 N/A Reserved N/A N/A
D15:00 R/W MAXF
’h
0600
Maximum frame length
Represents a maximum receive frame of 1536
octets (resets to
’h0600). An untagged maximum
size Ethernet is 1518 octets. A tagged frame adds
four octets, for a total of 1522 octets.
Program this field if you want a shorter maximum
length restriction.
Note: If a proprietary header is allowed, adjust
this field accordingly. For example, if
4-byte headers are appended to frames,
the MAXF field should be set to 1526
octets. This setting allows the maximum
VLAN tagged frame plus the 4-byte
header.
Table 66: Maximum Frame register bit definition
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
Reserved
MAXF