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Register Descriptions
2-18 Intel® 460GX Chipset Software Developer’s Manual
while masked will return an invalid ECC code. To disable testing, the mask value is left at 0h (the
default). The mask is a bit-wise XOR with the computed ECC.
Bits
Description
7:0 ECC Generation Mask - For 64 bits of data.
2.4.2.20 ECCMSK1: ECC Mask Register - Card A
Bus CBN, Device Number: 04h
Address Offset: C9h Size: 8 bits
Default Value: 00h Attribute: Read/Write
This register is used to test the ECC error detection logic in the memory subsystem for memory
card 1. To test, this register is written with a masking function. All subsequent writes into memory
will store a masked version of the computed ECC. Subsequent reads of memory locations written
while masked will return an invalid ECC code. To disable testing, the mask value is left at 0h (the
default). The mask is a bit-wise XOR with the computed ECC.
Bits
Description
7:0 ECC Generation Mask - For 64 bits of data.
2.4.2.21 ECCMSKF: ECC Mask Register
Bus CBN, Device Number: 04h
Address Offset: CAh Size: 8 bits
Default Value: 00h Attribute: Read/Write
This register is used to test the ECC error detection logic of the host processor bus. To test, this
register is written with a masking function. All subsequent processor reads will received a masked
version of ECC code. To disable testing, the mask value is left at 0h (the default). The mask is a
bit-wise XOR with the computed ECC.
Bits
Description
7:0 ECC Generation Mask - For 64 bits of data.
2.4.2.22 ParMskP: PB Parity Mask and IB Correction Enable Register
Bus CBN, Device Number: 04h
Address Offset: CBh Size: 8 bits
Default Value: 00h Attribute: Read/Write
The first 4 bits of this register are used to test the data parity error detection logic of the private bus.
To test, bits 3:0 are written with a masking function. All subsequent private bus reads will receive a
masked version of double byte parity. To disable testing, the mask value is left at 0h (the default).
The mask is a bit-wise XOR with the computed parity.
Bits 7:4 are used to enable ECC or parity checking for the different busses. Note that the SDC
defaults to no parity or ECC checking at power-on.
Bits
Description
7 Private Bus parity detection enable.
6 Front Side Bus ECC correction/detection enable.