Digi NS9750 - Manual (Page 381)

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E t h e r n e t C o m m u n i c a t i o n M o d u l e
Maximum Frame register
Address: A060 0414
Register bit assignment
Bits Access Mnemonic Reset Description
D31:16 N/A Reserved N/A N/A
D15:00 R/W MAXF 0x0600 Maximum frame length
Default value of 0x600 represents a maximum receive
frame of 1536 octets.
An untagged maximum-size Ethernet frame is 1518
octets. A tagged frame adds four octets for a total of
1522 octets. To use a shorter maximum length
restriction, program this field accordingly.
Note: If a proprietary header is allowed, this field
should be adjusted accordingly. For
example, if 4-byte proprietary headers are
prepended to the frames, the MAXF value
should be set to 1526 octets. This allows
the maximum VLAN tagged frame plus the
4-byte header.
Table 216: Maximum Frame register
Reserved
13 12 11 10 9 8 7 6 5 4 3 2 1 0 15 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 16 30
MAXF