PC104P-SIO4BX User Manual, Revision: 0
General Standards Corporation
8302A Whitesburg Drive Huntsville, AL 35802, Phone: (256) 880-8787
2.1.1 Firmware Revision: Local Offset 0x0000
The Firmware ID register provides version information about the firmware on the board. This is useful for technical
support to identify the firmware version.
D31:16
HW Board Rev
C411 = PC104P-SIO4BX Rev A
D15:8
Firmware Type ID
01 = SIO4B Standard
D7:0
Firmware Revision
Firmware Version
2.1.2 Board Control: Local Offset 0x0004
The Board Control Register defines the general control functions for the board. The main function in this register
defines the Demand mode DMA channel requests. For Demand mode DMA, there are only two physical DMA
channels which must be shared between the eight serial channels (Rx and Tx for each of four channels). The
Demand Mode DMA Channel Request allows the software to multiplex the DMA channels. This is typically
handled by the driver – the end user should have no need to change this register.
D31
Board Reset
1 = Reset all Local registers, FIFOs, and USC to their default values
Notes:
This bit will
automatically clear to 0 following the board reset.
The USCs will need to be reinitialized following a Board Reset.
D30:D9
RESERVED
D8
Rx FIFO Stop on Full
1 = If Rx FIFO becomes full, stop receiving data (disable receiver).
D7
Demand Mode DMA Channel 1 Single Cycle Disable
D6:4
Demand Mode DMA Channel 1 Request
D6 D5 D4 Demand Mode DMA 1 Channel
0
0
0
Channel 1 Rx
1
0
0
Channel 1 Tx
0
1
0
Channel 2 Rx
1
1
0
Channel 2 Tx
0
0
1
Channel 3 Rx
1
0
1
Channel 3 Tx
0
1
1
Channel 4 Rx
1
1
1
Channel 4 Tx
D3
Demand Mode DMA Channel 0 Single Cycle Disable
D2:0
Demand Mode DMA Channel 0 Request
D2 D1 D0 Demand Mode DMA 0 Channel
0
0
0
Channel 1 Rx
1
0
0
Channel 1 Tx
0
1
0
Channel 2 Rx
1
1
0
Channel 2 Tx
0
0
1
Channel 3 Rx
1
0
1
Channel 3 Tx
0
1
1
Channel 4 Rx
1
1
1
Channel 4 Tx
