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Ppc bus latency, Ppc bus latency -10, Table 3-5. ppc60x originated latency matrix – Motorola MVME2400 User Manual

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3-10

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Functional Description

3

PPC Bus Latency

The following tables list the latency of PPC originated transactions and the
bandwidth of originated transactions for five different clock ratios: 5:2,
3:2, 3:1, 2:1, and 1:1. The MVME2400 uses a 3:1 clock ratio:

Table 3-5. PPC60x Originated Latency Matrix

Transaction

32-bit PCI

64-bit PCI

Clock

Ratio

Beat

1

Beat

2

Beat

3

Beat

4

Total

Beat

1

Beat

2

Beat

3

Beat

4

Total

Burst Read

40

1

1

1

43

29

1

1

1

32

5:2

Burst Write

5

1

1

1

8

5

1

1

1

8

Single Read

22

-

-

-

22

-

-

-

-

-

Single Write

5

-

-

-

5

-

-

-

-

-

Burst Read

26

1

1

1

29

20

1

1

1

23

3:2

Burst Write

5

1

1

1

8

5

1

1

1

8

Single Read

16

-

-

-

16

-

-

-

-

-

Single Write

5

-

-

-

5

-

-

-

-

-

Burst Read

45

1

1

1

48

33

1

1

1

36

3:1

Burst Write

5

1

1

1

8

5

1

1

1

8

Single Read

24

-

-

-

24

-

-

-

-

-

Single Write

5

-

-

-

5

-

-

-

-

-

Burst Read

33

1

1

1

36

25

1

1

1

28

2:1

Burst Write

5

1

1

1

8

5

1

1

1

8

Single Read

19

-

-

-

19

-

-

-

-

-

Single Write

5

-

-

-

5

-

-

-

-

-

Burst Read

20

1

1

1

23

16

1

1

1

19

1:1

Burst Write

5

1

1

1

8

5

1

1

1

8

Single Read

13

-

-

-

13

-

-

-

-

-

Single Write

5

-

-

-

5

-

-

-

-

-