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MVME5100 Single Board Computer Programmer's Reference Guide

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ROM/Flash Speeds<br />

ACCESS TYPE<br />

Functional Description<br />

The SMC provides the interface for two blocks of ROM/Flash. Access<br />

times to ROM/Flash are programmable for each block. Access times are<br />

also affected by block width. Refer to Table 3-5, Table 3-6, Table 3-7, and<br />

Table 3-8 for specific timing numbers.<br />

Table 3-5. PPC60x Bus to ROM/Flash Access Timing<br />

(120ns @ 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 70 22 64 16 64 16 64 16 262 70<br />

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

1-Beat Read (1 byte) 22 22 - - - - - - 22 22<br />

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

bytes)<br />

70 22 - - - - - - 70 22<br />

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

Note The information in Table 3-5 applies to access timing when<br />

configured for devices with an access time equal to 12 clock<br />

periods.<br />

64<br />

Bits<br />

http://www.motorola.com/computer/literature 3-19<br />

3

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