Motorola MVME2400 Series Instrukcja Obsługi Pobierz pdf (Strona 68)

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Functional Description

Note: The information in Table 3-10 is appropriate when configured with

devices with an access time equal to 12 CLK periods.

Note: The information in Table 3-11 is appropriate when configured with

devices with an access time equal to 8 CLK periods.

Table 3-10. PPC Bus to ROM/Flash Access Timing (120ns @ 100MHz)

ACCESS TYPE

CLOCK PERIODS REQUIRED FOR:

Total

Clocks

1st Beat 2nd Beat 3rd Beat 4th Beat

Bits

4-Beat Read 70 22 64 16 64 16 64 16 262 70

4-Beat Write N/A N/A

1-Beat Read (1 byte) 2222------2222

1-Beat Read (2 to 8 bytes)7022------7022

1-Beat Write 2121------2121

Table 3-11. PPC Bus to ROM/Flash Access Timing (80ns @ 100MHz)

ACCESS TYPE

CLOCK PERIODS REQUIRED FOR:

Total

Clocks

1st Beat 2nd Beat 3rd Beat 4th Beat

Bits

4-Beat Read 54 18 48 12 48 12 48 12 198 54

4-Beat Write N/A N/A

1-Beat Read (1 byte) 1818------1818

1-Beat Read (2 to 8 bytes)5418------5418

1-Beat Write 2121------2121

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 177 178

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Motorola MVME2400 Series Instrukcja Obsługi Strona 68