Register 219H - Led/Bios Port; Register 218H - Temp/Abort Port - Xycom XVME-655 Manual

Register 219h – LED/BIOS Port
Table Chapter 2 -3 describes the LEDs and signals that register 219 controls.
Bit LED/Signal
0 FAULT
1 PASS
2 FLASHWR
3 FLB-A18
4 Reserved
5 BIOS_C8
6 BIOS_D0
7 BIOS_D8
Register 218h – TEMP/Abort Port
This register controls the temperature sensor and the abort toggle switch. It also allows
you to read the CMOS clear switch and VGA enable.
Bit Signal
0 TS_RESET
1 TS_WRITE
2 TS_DQ
3 TS_CLK
4 ABORT_STS
5 ABORT_CLR
6 VGA_EN
7 CLRCMOS
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Table Chapter 2 -3. LED/BIOS Port
Result
1 = Fault LED off
0 = Fault LED on
1 = PASS LED on
0 = PASS LED off
1 = Flash write enabled/A18 enable
Flash BIOS Address A18; when FLASHWR = 0
reads switch position 6
0
1 = Enable C8000h-CFFFFh on-board BIOS
1 = Enable D0000h - D7FFFh on-board BIOS
1 = Enable D8000h - DFFFFh on-board BIOS
Table Chapter 2 -4. Temp/Abort Port
Result
0 = Reset temperature sensor interface
Write data bit must be high when reading
temperature sensor
Temperature sensor read data bit
A low to high will clock in or clock out bit
1 = Abort toggle switch caused interrupt
1 = Enable abort
0 = Clear and disable abort
1 = On-board VGA controller enabled
1 = CMOS okay
0 = Clear CMOS
Chapter 2 – Installation
R/W
R/W
R/W
R/W
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R/W
R
R/W
R
R
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