February 2003
Intermediate to advanced
592 pages
11h 47m
English
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ISA/LPC Buses
The ISA and LPC buses reside typically on the PCI bus. These buses support bus mastering and legacy DMA transfers. These devices differ from HT and PCI devices in that they do not support either split transactions or retries.
Deadlocks
The specification defines two possible deadlock conditions that can occur because the ISA and LPC (Low Pin-Count) buses do not support transaction retry. For example, if an ISA (LPC) Master initiates a transaction that requires a response, the bus cannot handle a new request prior to the current transaction having completed. This type of protocol is extremely simple from an ordering perspective because all transactions must complete before the next one begins; thus, no ordering rules are required. ...
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