PCI-SIO4 User Manual
General Standards Corporation
8302A Whitesburg Drive Huntsville, AL 35802, Phone: (256) 880-8787
13
D0
Reset Channel 1 Tx FIFO (Pulsed)
Writing a ‘1’ to this bit will cause the channel 1 Tx FIFOs to be reset. If the
channel 1 Tx Almost register is not a value of 0x00000000 then this will also
cause the channel 1 Tx FIFOs almost flags to be programmed. After setting this
bit to a ‘1’, it is the software’s responsibility to delay approximately 10ms before
accessing the local side of the board again. This bit is a self-timed pulse;
therefore, it is not necessary for software to return to clear this bit, it will clear
itself.
D1
Reset Channel 1 Rx FIFO (Pulsed)
Writing a ‘1’ to this bit will cause the channel 1 Rx FIFOs to be reset. If the
channel 1 Rx Almost register is not a value of 0x00000000 then this will also
cause the channel 1 Rx FIFOs almost flags to be programmed. After setting this
bit to a ‘1’, it is the software’s responsibility to delay approximately 10ms before
accessing the local side of the board again. This bit is a self-timed pulse;
therefore, it is not necessary for software to return to clear this bit, it will clear
itself..
D2
Enable the Channel 1 Transmitters for the Upper portion of the cable (will drive the
cable)
Writing a ‘1’ to this bit will turn on the transmitters for the Channel 1 upper
portion of the cable. The signals that are turned on are the Channel 1 TxD and
Channel 1 CTS on the upper portion of the cable. This will cause these signals
on the cable to go from a tri-state condition to a driven state.
D3
Enable the Channel 1 Transmitters for the Lower portion of the cable (will drive the
Cable)
Writing a ‘1’ to this bit will turn on the transmitters for the Channel 1 lower
portion of the cable. The signals that are turned on are the Channel 1 TxD and
Channel 1 CTS on the lower portion of the cable. This will cause these signals
on the cable to go from a tri-state condition to a driven s tate.
D4
Enable the Channel 1 Receivers for the Upper portion of the cable (will load the cable)
Writing a ‘1’ to this bit will turn on the receivers for the Channel 1 upper portion
of the cable. The signals that are turned on are the Channel 1 RxD and Channel
1 DCD on the upper portion of the cable. This will cause these signals on the
cable to go from a tri-state condition to a loaded condition.
D5
Enable the Channel 1 Receivers for the Lower portion of the cable (will load the cable)
Writing a ‘1’ to this bit will turn on the receivers for the Channel 1 lower portion
of the cable. The signals that are turned on are the Channel 1 RxD and Channel
1 DCD on the lower portion of the cable. This will cause these signals on the
cable to go from a tri-state condition to a loaded condition.
D6
Reserved
D7
Reset Zilog for Channel 1-2 (Pulsed)
Writing a ‘1’ to this bit will cause the channel 1-2 Zilog Z16C30 USC to be
reset. This bit is a self-timed pulse; therefore, it is not necessary for software to
return to clear this bit, it will clear itself.
Note:
After power up and after any reset to this component, the next access
to channel 1 or channel 2 USC must be a write of 0x00 to offset 0x00 of
channel 1 USC.
D8
Channel 1 Tx FIFO Empty
(TRUE == 0)
D9
Channel 1 Tx FIFO Almost Empty
(TRUE == 0)
D10
Channel 1 Tx FIFO Almost Full
(TRUE == 0)
D11
Channel 1 Tx FIFO Full
(TRUE == 0)
D12
Channel 1 Rx FIFO Empty
(TRUE == 0)
D13
Channel 1 Rx FIFO Almost Empty
(TRUE == 0)
D14
Channel 1 Rx FIFO Almost Full
(TRUE == 0)