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Ethernet Control and Status registers
356
NS9750 Hardware Reference
Register bit assignment
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).
Table 215: Collision Window/Retry register
Reserved
RETX
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
CWINReserved Reserved