Mii management configuration register, Register bit assignment – Digi NS9215 User Manual
Page 295
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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
MII Management Configuration register
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295
Register bit
assignment
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M I I M a n a g e m e n t C o n f i g u r a t i o n r e g i s t e r
Address: A060 0420
Register
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 exam-
ple, 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.
Reserved
Not
used
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
Reserved
CLKS
SPRE
RMIIM
Bits
Access
Mnemonic
Reset
Description
D31:16
N/A
Reserved
N/A
N/A
D15
R/W
RMIIM
0
Reset MII management block
Set this bit to 1 to reset the MII Management module.
D14:05
N/A
Reserved
N/A
N/A