21150-AB

Manufacturer Part Number21150-AB
DescriptionCommunications, Transparent PCI-to-PCI Bridge
ManufacturerIntel Corporation
21150-AB datasheet
 

Specifications of 21150-AB

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Page 76/164:

Data Synchronization

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21150
6.4

Data Synchronization

Data synchronization refers to the relationship between interrupt signaling and data delivery. The
PCI Local Bus Specification, Revision 2.1, provides the following alternative methods for
synchronizing data and interrupts:
The device signaling the interrupt performs a read of the data just written (software).
The device driver performs a read operation to any register in the interrupting device before
accessing data written by the device (software).
System hardware guarantees that write buffers are flushed before interrupts are forwarded.
The 21150 does not have a hardware mechanism to guarantee data synchronization for posted write
transactions. Therefore, all posted write transactions must be followed by a read operation, either
from the device to the location just written (or some other location along the same path), or from
the device driver to one of the device registers.
68
Preliminary
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