AMD Geode LX 800@0.9W - Manual (Page 595)

AMD Geode™ LX Processors Data Book 595
GeodeLink™ PCI Bridge Register Descriptions 33234H
6.16.2.16 GLPCI Spare
MSR Address
5000201Fh
Type R/W
Reset Value 00000000_00000003h
GLPCI Spare
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
Spare
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Spare RSVD
AIL
T
O
PPD PPC MPC MME NS
E
SUPO
GLPCI Spare Bit Descriptions
Bit Name Description
63:10 Spare Spare Bits. Extra bits available for future use. These bits may be set and cleared, but do
not control anything.
9:7 RSVD Reserved. Write as read.
6 AILTO Alternate Initial Latency Timeout. Enables alternate initial latency timeout values to be
configured via ILTO (MSR 50002010h[41:40]).
5 PPD Post PIO Data. Enables posting of I/O writes to addresses: 170h and 1F0h.
4 PPC Post PIO Control. Enables posting of I/O writes to addresses: 171h, 172h, 173h, 174h,
175h, 176h, 177h, 1F1h, 1F2h, 1F3h, 1F4h, 1F5h, 1F6h and 1F7h.
3 MPC Maximum Posted Count. Controls the maximum number of PIO I/O writes that may be
posted in the GLPCI. When cleared, one I/O write may be posted. When set, two I/O
writes may be posted.
2 MME Mask External MSR Exceptions. Set to 1 to force the GLIU synchronous exception flag
to be cleared for all external MSR transactions.
1 NSE No Synchronous Exceptions. Controls when out-bound read data is written into the
OBRD FIFO. When this bit is cleared. the GLPCI pipelines the writing of all out-bound
read data into the FIFO. This allows PCI transaction status to be sampled and included
synchronously with the read data. When this bit is cleared, the GLPCI only pipelines read
data for external MSR accesses and I/O read of the configuration data port (0CFCh).
0 SUPO Strict Up-Stream Ordering. Controls how out-bound reads get sorted with in-bound
writes. When this bit is set the ordering rules are strictly applied; meaning that all GLIU
write responses associated with a in-bound PCI write transaction must complete before
data from a subsequent out-bound PCI read may be placed onto the GLIU. When this bit
is cleared the out-bound read data may be placed onto the GLIU after the in-bound write
data has been placed onto the GLIU.