Motorola MVME2400 Series Service Manual download pdf (Page 58)

3-10 Computer Group Literature Center Web Site

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 Write5111851118

Single Read 22 - - - 22 - - - - -

Single Write 5 - - - 5 - - - - -

Burst Read 26 1 1 1 29 20 1 1 1 23 3:2

Burst Write5111851118

Single Read 16 - - - 16 - - - - -

Single Write 5 - - - 5 - - - - -

Burst Read 45 1 1 1 48 33 1 1 1 36 3:1

Burst Write5111851118

Single Read 24 - - - 24 - - - - -

Single Write 5 - - - 5 - - - - -

Burst Read 33 1 1 1 36 25 1 1 1 28 2:1

Burst Write5111851118

Single Read 19 - - - 19 - - - - -

Single Write 5 - - - 5 - - - - -

Burst Read 20 1 1 1 23 16 1 1 1 19 1:1

Burst Write5111851118

Single Read 13 - - - 13 - - - - -

Single Write 5 - - - 5 - - - - -

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 177 178

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