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MVME5100 Single Board Computer Programmer's Reference Guide

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Functional Description<br />

PPC1-Bug>md feff0000<br />

FEFF0000 10574801 00030000 00A0FFF6 00000000 .W................<br />

FEFF0010 000000BE 00000000 00000000 00000000 ....................<br />

PPC1-Bug>md feff0060<br />

FEFF0060 000FFFFF 0000FFFF 000FFFFF 0000FFFF ....................<br />

FEFF0070 03FE0000 00000000 00000000 FFFFFFFF ....................<br />

PPC1-Bug>mw feff0068 55;b<br />

Effective address: FEFF0068<br />

Effective data : 55<br />

PPC1-Bug>md feff0060<br />

FEFF0060 000FFFFF 0000FFFF 004FFFFF 0000FFFF ........O...........<br />

FEFF0070 03FE0000 00000000 00000000 FFFFFFFE ....................<br />

PPC1-Bug>mw feff0068 aa0f5555<br />

Effective address: FEFF0068<br />

Effective data: : AA0F5555<br />

PPC1-Bug>md feff0060<br />

FEFF0060 000FFFFF 0000FFFF 000F5555 00005555 ...........UU..UU...<br />

FEFF0070 03FE0000 00000000 00000000 FFFFFFFE ....................<br />

PPC1-Bug><br />

PCI/PPC Contention Handling<br />

The PHB has a mechanism that detects when there is a possible resource<br />

contention problem (i.e., deadlock) as a result of overlapping PPC and PCI<br />

initiated transactions. The PPC Slave, PCI Slave, and PCI Master<br />

functions contain the logic needed to implement this feature.<br />

The PCI Slave and the PPC Slave contribute to this mechanism in the<br />

following manner. Each slave function will issue a stall signal to the PCI<br />

Master anytime it is currently processing a transaction that must have<br />

control of the opposing bus before the transaction can be completed. The<br />

events that activate this signal are:<br />

❏ Read cycle with no read data in the FIFO<br />

❏ Non-posted write cycle<br />

❏ Posted write cycle and FIFO full<br />

http://www.motorola.com/computer/literature 2-45<br />

2

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