參數(shù)資料
型號： IBM21P100BGC
元件分類： 總線控制器
英文描述： PCI BUS CONTROLLER, PBGA304
封裝： 31 X 31 MM, PLASTIC, BGA-304
文件頁數(shù)： 108/144頁
文件大?。?/td> 5197K
代理商： IBM21P100BGC
IBM21P100BGC
IBM 133 PCI-X Bridge R2.0
Configuration Registers
Page 66 of 144
ppb20_pcix_regs.fm.01
October 15, 2001
11
RW
Enable Relaxed Ordering
For a read operation, this bit enables read completions that occur after the first read completion to bypass
posted writes and complete with a higher priority. Only read completions being presented on the primary inter-
face are affected by this bit.
0
Conventional mode, read command relaxed ordering disabled: each target bus read completion trans-
action will be ordered with posted writes in the opposite direction (traveling the same direction as the
completion data). see the PCI Bridge Specification 2.0, Table 5-2.
1
Conventional mode, read command relaxed ordering enabled: only the first read completion of a read
transaction will be required to meet the PCI ordering requirement for delayed read completion vs.
posted writes (PCI Bridge Specification 2.0, Table 5-2) all subsequent read completions for the same
master transaction will be allowed to pass posted writes in the opposite direction.
This bit is used only for requests issued in the PCI mode. For requests issued in the PCI-X mode the relaxed
ordering bit in the attribute field takes precedence.
10
RW
Primary Special Delayed Read Mode Enable bit
Allows a primary master to change memory read command code (MR, MRL, or MRM) after it has received retry
to another memory read command code (MR, MRL, or MRM).
0
Retry any primary master which repeats its transaction with command code changes.
1
Completed MR, MRL, or MRM transaction on the secondary bus and the initiator (or another) master
on the primary bus initiates a MR, MRL, or MRM transaction with the same address and byte enables,
then the bridge will complete it normally.
This bit is ignored when the primary interface is in the PCI-X mode.
9:8
RW
Primary Read prefetch mode bits (prefetchable range only)
Controls prefetching for memory read transactions in prefetchable range that are initiated on the primary bus.
00
One cache line prefetch.
01
Reserved.
10
Full prefetch.
11
No prefetching, full handshake between initiator and target. Disconnect on first DWord.
These bits are ignored when the primary interface is in the PCI-X mode.
7:6
RW
PrimaryReadLine prefetchmodebits
Controls prefetching for Memory Read Line that are initiated on the primary bus.
00
One cache line prefetch.
01
Reserved.
10
Full prefetch.
11
Reserved.
These bits are ignored when the primary interface is in the PCI-X mode.
5:4
RW
PrimaryReadMultipleprefetchmode bits
Controls prefetching for Memory Read Multiple transactions that are initiated on the primary bus.
00
One cache line prefetch.
01
Reserved.
10
Full prefetch.
11
Reserved.
These bits are ignored when the primary interface is in the PCI-X mode.
3:0
RO
Reserved.
Bit(s)
Access
Field Name and Description
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