Rabbit 6000 User’s Manual
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295
25.4 Register Descriptions
Network Port B Data Register
(NBDR)
(Address = 0x0200)
Bit(s)
Value
Description
7:0
Read
Returns the contents of the receive buffer. This register is not normally
accessed by the processor, but is accessed by the DMA channels.
Write
Loads the transmit buffer with a data byte for transmission.
Network Port B Last Data Register
(NBLDR)
(Address = 0x0201)
Bit(s)
Value
Description
7:0
Read
Returns the contents of the receive buffer. This register is not normally
accessed by the processor, but is accessed by the DMA channels.
Write
Loads the transmit buffer with the last data byte of a frame to enable the
subsequent transmission of the CRC. The DMA automatically writes the
last byte of the frame to this address.
Network Port B Transmit Status Register
(NBTSR)
(Address = 0x0202)
Bit(s)
Value
Description
7
0
Frame transmission not complete.
1
Frame transmission complete.
6
0
Frame transmission is not deferring.
1
Frame transmission is deferring.
5
0
No excessive collisions.
1
Frame transmission aborted due to excessive collisions.
4
0
No transmit underrun.
1
Frame transmission aborted because of a FIFO underrun.
3
0
Frame transmission not too long.
1
Frame transmission too long.
2
0
No excessive defers.
1
Frame transmission deferred excessively.
1
0
No collisions.
1
Frame transmission encountered at least one collision.
0
0
No late collisions.
1
Frame transmission encountered a late collision (later than one slot time).
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