Pchip Agp Error Register (Agperror; Pchip Agp Error Register - Compaq AlphaServer ES45 Service Manual

D.16 Pchip AGP Error Register (AGPERROR )
The register is used for logging AGP errors.
If any of bits <6:4, 0> are set, then this entire register is frozen and the Pchip output signal
h_err is asserted. Only bit <0> can be set after that. All other values will be held until bits
<6:4> are clear. When an error is detected and one of bits <6:4> is set, the associated cache
block address and AGP bus command are captured in bits <63:16> of this register.
Table D–15 Pchip AGP Error Register
Field Bits
RES <63:60>
FENCE <59>
LENGTH <58:53>
CMD <52:50>
Type Init Description
MBZ 0 Reserved
RO 0 Fence bit, used only if command code
indicates LP transaction.
RO 0
AGJP transaction length in
quadwords
RO 0 AGP Command
Value
000
001
010
011
100,101 Reserved
110
111
Command
Read (low priority)
Read (high priority)
Write (low priority)
Write (high priority)
Flush
Fence
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Registers D-35