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| 型號(hào)： | IBM21P100BGC |
| 元件分類(lèi)： | 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(yè)數(shù)： | 132/144頁(yè) |
| 文件大?。?/td> | 5197K |
| 代理商： | IBM21P100BGC |
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IBM21P100BGC
IBM 133 PCI-X Bridge R2.0
Configuration Registers
Page 88 of 144
ppb20_pcix_regs.fm.01
October 15, 2001
5.2.5.21 Secondary Bus Upstream Split Transaction Register
This register controls the behavior of the bridge buffers for forwarding split transactions from a secondary bus
requester to a primary bus completer. When the completer bus is in the PCI-X mode, the split transaction
commitment limit field only affects the byte count used when issuing read requests.
Address Offset
x‘88’
Access
See bit descriptions
Reset Value
x‘0020 0020’
Split Transaction Commitment Limit
Split Transaction Capacity
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
Bit(s)
Access
Field Name and Description
31:16
RW
Split Transaction Commitment Limit
This field indicates the cumulative sequence size for all memory read transactions forwarded by the bridge
from requesters on the secondary bus addressing completers on the primary bus.
This field indicates the size of the commitment limit in units of ADQs.
Software is permitted to program this field to any value greater than or equal to the contents of the split transac-
tion capacity field. A value less than the contents of the split transaction capacity field causes unspecified
results. If this field is set to x‘FFFF’, the bridge is permitted to forward all split requests of any size regardless of
the amount of buffer space available.
A value of x‘0100’ or greater will cause the bridge to forward accepted split requests of any size regardless of
the amount of buffer space available.
Software is permitted to change this field at any time. The most recent value of the field is used each time the
bridge forwards a split transaction.
Stateafter RST#isthe same as thesplit transactioncapacityfield.
15:0
RO
Split Transaction Capacity
This read-only field indicates the size of the buffer (in number of ADQs) for storing split completions for memory
reads. This applies to requesters on the secondary bus addressing completers on the primary bus.
The bridge returns x‘0020’ to indicate that there are 32 ADQs (4K bytes) available buffer space.
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