GE C2K Hardware Reference Manual page 74

Status Register
The Status Register provides C2K status information such as flash and system memory size, flash
write-protect, and emergency boot select settings.
NOTE: Bits 15–12 only revert to the default value during power-up and are not affected by resets.
Address offset: 0x8
Access: Read-only
Bits Field
15 RST_CAUSE_TEMP
14 RST_CAUSE_CPU
13 RST_CAUSE_WDOG
12 RST_CAUSE_CPCI
11 SYS_SLOT
10 PCI_PRESENT
9 EM_BOOT_SEL
8 ROM_WP_IN
7 ROM_PERM_WP_IN
6 FLASH_BUSY
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Access Default
RW 0* Reset Cause Register - Temp—indicates that a CPU
Over-Temperature alarm initiated the last board reset.
0 = other cause initiated last board reset
1 = Over-temp alarm initiated last board reset
RW 0* Reset Cause Register - CPU—indicates that the processor,
through the BRD_RST bits, initiated the last board reset
(see BRD_RST bits (bit 9–6) in Control Register).
0 = other cause initiated last board reset
1 = BRD_RST bits initiated last board reset
RW 0* Reset Cause Register - Watchdog timer—indicates that a
watchdog timer expiration initiated the last board reset.
0 = other cause initiated last board reset
1 = watchdog timer expiration initiated last board reset
RW 0* Reset Cause Register - cPCI—indicates that the PRST# or
PCI_RST# signal from the cPCI backplane initiated the last
board reset.
0 = other cause initiated last board reset
1 = PRST# or PCI_RST# signal initiated last board
R - CPCI System Slot status—indicates whether the C2K is
installed in a system or peripheral slot.
0 = C2K installed in peripheral slot
1 = C2K installed in system slot
R - cPCI Bus Present—indicates the presence of a cPCI bus.
0 = no cPCI bus present
1 = cPCI bus present
R - Emergency Boot Jumper Select—indicates whether the
EM_BOOTSEL# signal has been asserted either by install-
ing a jumper at EM_BOOTSEL# header/jumper (P7) or
through the EM_BOOTSEL# backplane pin to force the C2K
to boot from emergency boot code.
0 = boot from user boot area of flash
1 = boot from emergency boot area of flash
R - Boot ROM write protect input active.
0 = boot ROM write protection disabled
1 = boot ROM write protection enabled
R - Boot ROM permanent write protection active.
0 = boot ROM permanent write protection disabled
1 = boot ROM permanent write protection enabled
R - Flash Busy—indicates whether a program or erase cycle is
currently executing in flash.
0 = flash is ready for next command
1 = flash is busy
Description
reset
Resources
5-8