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MVME5100 Single Board Computer Programmer's Reference Guide

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Functional Description<br />

The PCI Master always removes its request when it receives a disconnect<br />

or a retry.<br />

There is a case where the PCI Master could assert a request but not actually<br />

perform a bus cycle. This may happen if the PCI Master is placed in the<br />

speculative request mode. Refer to the section titled PCI/PPC Contention<br />

Handling for more information. In no case will the PCI Master assert its<br />

request for more than 16 clocks without starting a transaction.<br />

Fast Back-to-Back Transactions<br />

The PCI Master does not generate fast back-to-back transactions.<br />

Arbitration Latency<br />

Because a bulk of the transactions are limited to single-beat transfers on<br />

PCI, the PCI Master does not implement a Master Latency Timer.<br />

Exclusive Access<br />

The PCI Master is not able to initiate exclusive access transactions.<br />

Address/Data Stepping<br />

The PCI Master does not participate in the Address/Data Stepping<br />

protocol.<br />

Parity<br />

The PCI Master supports address parity generation, data parity generation,<br />

and data parity error detection.<br />

Cache Support<br />

Generating PCI Cycles<br />

The PCI Master does not participate in the PCI caching protocol.<br />

There are four basic types of bus cycles that can be generated on the PCI<br />

bus:<br />

❏ Memory and I/O<br />

❏ Configuration<br />

❏ Special Cycle<br />

❏ Interrupt Acknowledge<br />

http://www.motorola.com/computer/literature 2-29<br />

2

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