Board Status : Local Offset X 0008; Hannel Lmost Lags Ocal Ffset 0040; Hannel Lmost Lags Ocal Ffset 0044; Hannel Fifo: Local Ffset 0048 - General Standards Corporation PC104P-SIO4BX Hardware User Manual

2.1.3 Board Status: Local Offset 0x0008
The Board Status Register gives general overall status for a board. The Board Jumpers are physical jumpers which
can be used to distinguish between boards if multiple SIO4 boards are present in a system.
D31
D30:D16
D15
D14
D13
D12
D11
D10
D9
D8
D7:D2
D1
D0
2.1.5 Channel Tx Almost Flags: Local Offset 0x0010 / 0x0020 / 0x0030 / 0x0040
The Tx Almost Flag Registers are used to set the Almost Full and Almost Empty Flags for the transmit FIFOs. The
FIFO almost flags may be used to determine a fill level for a specific transfer size.
D31:16
D15:0
2.1.6 Channel Rx Almost Flags: Local Offset 0x0014 / 0x0024 / 0x0034 / 0x0044
The Rx Almost Flag Registers are used to set the Almost Full and Almost Empty Flags for the receive FIFOs. The
FIFO almost flags may be used to determine a fill level for a specific transfer size.
D31:16
D15:0
2.1.7 Channel FIFO: Local Offset 0x0018 / 0x0028 / 0x0038 / 0x0048
The Channel FIFO Register passes serial data to/from the serial controller chips. The same register is used to access
both the Transmit FIFO (writes) and Receive FIFO (reads).
D31:8
D7:0
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Board Reset In Progress
RESERVED
External Ch4 Rx FIFO Not Present
External Ch4 Tx FIFO Not Present
External Ch3 Rx FIFO Not Present
External Ch3 Tx FIFO Not Present
External Ch2 Rx FIFO Not Present
External Ch2 Tx FIFO Not Present
External Ch1 Rx FIFO Not Present
External Ch1 Tx FIFO Not Present
RESERVED
Board Jumper 1
0 = Jumper J5:3-4 installed
Board Jumper 0
0 = Jumper J5:1-2 installed
Tx Almost Full Flag Value
Almost Full Flag will be asserted when the FIFO has space for "Almost Full Value"
words or fewer (i.e. FIFO contains (FIFO Size – Almost Full Value) words or more.)
Tx Almost Empty Flag Value
Almost Empty Flag will be asserted when the FIFO contains "Almost Empty Value"
words or fewer.
Rx Almost Full Flag Value
Almost Full Flag will be asserted when the FIFO has space for "Almost Full Value"
words or fewer (i.e. FIFO contains (FIFO Size – Almost Full Value) words or more.)
Rx Almost Empty Flag Value
Almost Empty Flag will be asserted when the FIFO contains "Almost Empty Value"
words or fewer.
RESERVED
Channel FIFO Data
PC104P-SIO4BX User Manual, Revision: 0
General Standards Corporation