Registers; Register 218H - Abort/Clear Cmos Port; Register 219H - Led/Bios Port - Xycom XVME-653 Manual

Registers

The XVME-653/658 contains four I/O port registers: 218h, 219h, 233h, and 234h.
Register 218h – Abort/Clear CMOS Port
This register controls the abort toggle switch and allows you to read the CMOS clear
jumper (J17).
Bit Signal
0 RESERVED
1 RESERVED
2 RESERVED
3 RESERVED
4 ABORT_STS
5 ABORT_CLR
6 RESERVED
7 CLRCMOS
Register 219h – LED/BIOS Port
This register controls the following LEDs and signals.
Bit LED/Signal
0 FAULT
1 PASS
2 FLB_A18_EN
3* FLB_A18/reserve2
4 RESERVED
5 BIOS_D0
6 RESERVED
7 RESERVED
A18, along with control ROM/RAM 15-17 are to be used to page the
Flash when FLB_A18_EN is asserted.
Table 2-8 Abort/Clear CMOS Port Register Settings
Reserved
Reserved
Reserved
Reserved
1 = Abort toggle switch caused interrupt
0 = Clear and disable abort
1 = Enable abort
Reads jumper J13
0 = Clear CMOS
1 = CMOS okay
Table 2-9 LED/BIOS Port Register Settings
0 = Fault LED on
1 = Fault LED off
0 = PASS LED off
1 = PASS LED on
1 = Flash write enabled and A18 is controllable
Reads jumper J19 when FLB_A18_EN = 0
Flash BIOS address A18 when FLB_A18_EN = 1
Reserved
1 = Enable UPPER on board BIOS area @D0000
Reserved
Reserved
*Note
Result
Result
Chapter 2 – Installation
R/W
R
R/W
R
R
R/W
R/W
R/W
R/W
R/W
R/W
2-5