Register Descriptions - Rabbit 6000 User Manual

25.4 Register Descriptions

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