
122
PRELIMINARY
82453KX/GX, 82452KX/GX, 82451KX/GX (MC)
A
2.3.28 SERRSTS—SYSTEM ERROR STATUS REGISTER
Address Offset:
C6–C7h
Default:
0000h
Attribute:
Read /Write Clear
This register logs system errors. Software sets these bits to 0 by writing a 1 to them.
2.4
Memory Configuration Determination Algorithm
The number of rows of memory and the size of the memory in each row must be determined by power-on self
test (POST) code prior to programming the configuration registers for the true system configuration.
After reset, each MC is configured for a non-interleaved memory configuration operating with the default values
given in the Memory Timing Register. Base addresses are set assuming maximum memory. However, row
limits are set at 4 Mbytes.
To complete the configuration of the MCs in a system the BIOS must perform a complete setup as described in
the
Pentium Pro Processor BIOS Writer’s Guide (Order #649733).
Bits
Function
15:5
Reserved.
4
Host Address Parity Error Detected. (via AP[1:0]#). 1=Logs parity errors on A[35:3], regardless of
whether the event is reported. If AERR# Input Enable (bit 4) of the SERRCMD Register is set, the
event is reported during the error phase.
3
Host Bus Request Parity Error Detected (via RP#). 1=Logs parity errors on the ADS# and
REQ[4:0]# signals, regardless of whether the event is reported. If enabled in the SERRCMD Register
(bit 4), this error is reported by generating an AERR#.
2
450KX: Reserved.
1
450KX: Reserved.
0
Host Bus Protocol Violation Detected (via RSP#). 1=Logs protocol violations, regardless of
whether event is reported. If BINIT# is enabled in the SERRCMD Register, these errors are reported
by generating a BINIT#.
450GX: Host Bus Correctable Error Detected. 1=Logs a single-bit ECC error detected on the host
data bus. No error is reported when a host bus correctable error is detected.
450GX: Host Bus Uncorrectable Error Detected. 1=Logs a multiple-bit ECC error detected on the
host data bus. Note that this bit is set independent of whether error reporting is enabled via bit 7 of
the SERRCMD Register. If BERR# is enabled in the SERRCMD Register, this error is reported by
generating a BERR#.