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MVME5100 Single Board Computer Programmer's Reference Guide

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3<br />

System Memory Controller (SMC)<br />

ACCESS TYPE<br />

Table 3-6. PPC60x Bus to ROM/Flash Access Timing<br />

(80ns @ 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 54 18 48 12 48 12 48 12 198 54<br />

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

1-Beat Read (1 byte) 18 18 - - - - - - 18 18<br />

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

bytes)<br />

54 18 - - - - - - 54 18<br />

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

ACCESS TYPE<br />

Notes The information in Table 3-6 applies to access timing when<br />

configured for devices with an access time equal to 8 clock<br />

periods.<br />

Table 3-7. PPC60x Bus to ROM/Flash Access Timing<br />

(50ns @ 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 42 15 36 9 36 9 36 9 150 42<br />

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

1-Beat Read (1 byte) 15 15 - - - - - - 15 15<br />

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

bytes)<br />

42 15 - - - - - - 42 15<br />

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

64<br />

Bits<br />

64<br />

Bits<br />

3-20 <strong>Computer</strong> Group Literature Center Web Site

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