Intel cPCI-7200 Instrukcja Użytkownika Pobierz pdf (Strona 42)

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Operation Theory

3.

I_REQ & I_ACK Handshaking

valid data

D10~DI31

valid data

t1

t2

t5

t4t3

IN I_REQ

IN I_ACK

t

1

≥

0ns t

5

≥

60ns t

3

≥

2 PCI CLK Cycle

t

2

≥

0ns t

4

≥

1 PCI CLK Cycle

Note:

I_REQ must be asserted until I_ACK asserts, I_ACK will be asserted

until I_REQ de-asserts.

4.

O_REQ as output data strobe

Out O_REQ

t

cyc

t

h

t

s

D00~D031

valid data

valid data

t

s

≥

19ns t

h

≥

2 PCI CLK Cycles T

cyc

≥

500ns

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 70 71

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