Maximum frame register, Register bit assignment – Digi NS9215 User Manual
Page 294
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
294
Hardware Reference NS9215
Register bit
assignment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
M a x i m u m F r a m e r e g i s t e r
Address: A060 0414
Register
Bits
Access
Mnemonic
Reset
Description
D31:14
N/A
Reserved
N/A
N/A
D13:08
R/W
CWIN
0x37
Collision window
Programmable field indicating the slot time or collision
window during which collisions occur in properly
configured networks. Because the collision window
starts at the beginning of transmissions, the preamble
and SFD (start-of-frame delimiter) are included.
The default value (0x37 (55d)) corresponds to the frame
byte count at the end of the window.
D07:04
N/A
Reserved
N/A
N/A
D03:00
R/W
RETX
0xF
Retransmission maximum
Programmable field specifying the number of
retransmission attempts following a collision before
aborting the frame due to excessive collisions. The
802.3u standard specifies the
attemptLimit
to be
0xF (15d)
.
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