Rabbit 6000 User’s Manual
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302
Network Port B Gap 0 Register
(NBG0R)
(Address = 0x0244)
Bit(s)
Value
Description
7
This bit is ignored and will always return zero when read.
6:0
Back-to-back interpacket gap. Recommended values are 0x15 for full-
duplex operation, and 0x12 for half-duplex operation. These values result
in 9.6 µs for 10 Mbit/s and 0.96 µs for 100 Mbit/s, as specified by 802.3.
Network Port B Gap 2 Register
(NBG2R)
(Address = 0x0246)
Bit(s)
Value
Description
7
This bit is ignored and will always return zero when read.
6:0
Non-back-to-back interpacket gap for carrier deference. Recommended
value is 0x0C, as specified by 802.3.
Network Port B Gap 1 Register
(NBG1R)
(Address = 0x0247)
Bit(s)
Value
Description
7
This bit is ignored and will always return zero when read.
6:0
Non-back-to-back interpacket gap. Recommended value is 0x12. This
value results in 9.6 µs for 10 Mbits/s and 0.96 µs for 100 Mbits/s, as
specified by 802.3.
Network Port B Retransmit Max Register
(NBRMR)
(Address = 0x0248)
Bit(s)
Value
Description
7:4
These bits are ignored and will always return zero when read.
3:0
Number of retransmission attempts after a collision before aborting.
Default (and value specified by 802.3) is 0xF.
Network Port B Collision Window Register
(NBCWR)
(Address = 0x0249)
Bit(s)
Value
Description
7:6
These bits are ignored and will always return zero when read.
5:0
Collision window (slot time). Default (and value specified by 802.3) is
0x37.
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