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Motorola MVME2400 User Manual

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Block Diagram

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3-21

3

Note: The information in Table 3-12 is appropriate when configured with
devices with an access time equal to 5 CLK periods.

Note: The information in Table 3-13 is appropriate when configured with
devices with an access time equal to 3 CLK periods.

Table 3-12. PPC Bus to ROM/Flash Access Timing (50ns @ 100MHz)

ACCESS TYPE

CLOCK PERIODS REQUIRED FOR:

Total

Clocks

1st Beat

2nd Beat

3rd Beat

4th Beat

16

Bits

64

Bits

16

Bits

64

Bits

16

Bits

64

Bits

16

Bits

64

Bits

16

Bits

64

Bits

4-Beat Read

42

15

36

9

36

9

36

9

150

42

4-Beat Write

N/A

N/A

1-Beat Read (1 byte)

15

15

-

-

-

-

-

-

15

15

1-Beat Read (2 to 8 bytes)

42

15

-

-

-

-

-

-

42

15

1-Beat Write

21

21

-

-

-

-

-

-

21

21

Table 3-13. PPC Bus to ROM/Flash Access Timing (30ns @ 100MHz)

ACCESS TYPE

CLOCK PERIODS REQUIRED FOR:

Total

Clocks

1st Beat

2nd Beat

3rd Beat

4th Beat

16

Bits

64

Bits

16

Bits

64

Bits

16

Bits

64

Bits

16

Bits

64

Bits

16

Bits

64

Bits

4-Beat Read

34

13

28

7

28

7

28

7

118

34

4-Beat Write

N/A

N/A

1-Beat Read (1 byte)

13

13

-

-

-

-

-

-

13

13

1-Beat Read (2 to 8 bytes)

34

13

-

-

-

-

-

-

34

13

1-Beat Write

21

21

-

-

-

-

-

-

21

21