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MVME5100 Single Board Computer Programmer's Reference Guide

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ACCESS TYPE<br />

Functional Description<br />

Note The information in Table 3-7 applies to access timing when<br />

configured for devices with an access time equal to 5 clock<br />

periods.<br />

Table 3-8. PPC60x Bus to ROM/Flash Access Timing<br />

(30ns @ 100 MHz)<br />

CLOCK PERIODS REQUIRED FOR: Total<br />

Clocks<br />

1st Beat 2nd Beat 3rd Beat 4th Beat<br />

16<br />

Bits<br />

64<br />

Bits<br />

16<br />

Bits<br />

64<br />

Bits<br />

16<br />

Bits<br />

64<br />

Bits<br />

16<br />

Bits<br />

64<br />

Bits<br />

16<br />

Bits<br />

4-Beat Read 34 13 28 7 28 7 28 7 118 34<br />

4-Beat Write N/A N/A<br />

1-Beat Read (1 byte) 13 13 - - - - - - 13 13<br />

1-Beat Read (2 to 8<br />

bytes)<br />

34 13 - - - - - - 34 13<br />

1-Beat Write 21 21 - - - - - - 21 21<br />

Note The information in Table 3-8 applies to access timing when<br />

configured for devices with an access time equal to 3 clock<br />

periods.<br />

64<br />

Bits<br />

http://www.motorola.com/computer/literature 3-21<br />

3

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