Service manual

3-14 AlphaServer DS20 Service Manual
Table 3-7 Pchip Error Register
Name Bits Type
Initial
State Description
SYN <63:56> RO 0 ECC syndrome of error if CRE or
UECC.
PCI command when error occurred if not
CRE or UECC.
If CRE or UECC, then:
Value Command
0000 DMA read
0001 DMA read-modify-write
0011 SGTE read
CMD <55:52> RO 0
Others Reserved
INV <51>
RO Rev1
RAZ Rv0
0
Info Not Valid – meaningful when one
of bits <11:0> is set. Indicates the
validity of SYN, CMD, and ADDR bits.
Valid = 0, Invalid = 1.
ADDR <50:16> RO 0
If CRE or UECC, then ADDR<50:19> =
system address <34:3> of erroneous
quadword and ADDR<18:16> = 0.
If not CRE and not UECC, then
ADDR<50:48> = 0;
ADDR<47:18> = starting PCI address
<31:2> of transaction when error was
detected;
ADDR<17:16> = 00 → not a DAC
operation;
ADDR<17:16> = 01 → via DAC SG
Window 3;
ADDR<17> = 1 → via Monster Window
RES <15:12> MBZ, RAZ 0 Reserved
CRE <11> R, W1C 0 Correctable ECC error.
UECC <10> R, W1C 0 Uncorrectable ECC error.
RES <9> MBZ, RAZ 0 Reserved.
NDS <8> R, W1C 0 No b_devsel_l as PCI master.