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W_STROBE w
t
WP
(m)
t
cyc
* 1
W_SETUP ) W_STROBE w max
ǒ
ǒ
t
EM_A
) t
AW
(m) * t
EM_WE
Ǔ
t
cyc
,
ǒ
t
EM_D
) t
DS
(m) * t
EM_WE
Ǔ
t
cyc
Ǔ
* 1
W_HOLD w max
ǒ
ǒ
t
EM_WE
) t
WR
(m) * t
EM_A
Ǔ
t
cyc
,
ǒ
t
EM_WE
) t
DH
(m) * t
EM_D
Ǔ
t
cyc
Ǔ
* 1
W_SETUP ) W_STROBE ) W_HOLD w
t
WC
(m)
t
cyc
* 3
1
Setup
2
Strobe
3
Hold
4
EM_CS
EM_CS (ASRAM)
EM_A[21:0]/
EM_BA[1:0]
EM_A[21:0]/
EM_BA[1:0] (ASRAM)
EM_WE
EM_WE (ASRAM)
EM_D[15:0]
EM_D[15:0]
(ASRAM)
t
EM_CS
t
EM_CS
t
EM_A
t
WC
(m)
t
WR
(m)
t
EM_A
t
WP
(m)
t
EM_WE
t
AW
(m)
t
EM_WE
t
EM_D
t
DS
(m)
t
EM_D
t
DH
(m)
Use Cases
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Figure 15. Timing Waveform of an ASRAM Write with PCB Delays
36
Asynchronous External Memory Interface (EMIF) SPRUEQ7C–February 2010
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