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R_SETUP w
t
CLR
(m)
t
cyc
* 1 w
ǒ
10
10
Ǔ
* 1 w 0
R_STROBE w max
ǒ
ǒ
t
REA
(m) ) t
SU
Ǔ
t
cyc
,
t
RP
t
cyc
Ǔ
* 1 w
ǒ
65
10
Ǔ
* 1 w 5.5
R_SETUP ) R_STROBE w
ǒ
t
CEA
) t
SU
Ǔ
t
cyc
* 1 w
(75 ) 5)
10
* 1 w 7
R_HOLD w
ǒ
t
H
* t
CHZ
(m)
Ǔ
t
cyc
* 1 w
(0 * 20)
10
* 1 w * 3
R_SETUP ) R_STROBE ) R_HOLD w
t
RC
(m)
t
cyc
* 3 w
ǒ
80
10
Ǔ
* 3 w 5
TA w max
ǒ
t
CHZ
(m)
t
cyc
,
t
RHZ
(m) * (R_HOLD ) 1)t
cyc
t
cyc
Ǔ
* 1 w
ǒ
20
10
Ǔ
* 1 w 1
W_STROBE w
t
WP
(m)
t
cyc
* 1 w
ǒ
60
10
Ǔ
* 1 w 5
W_SETUP w max
ǒ
t
CLS
(m)
t
cyc
,
t
ALS
(m)
t
cyc
,
t
CS
(m)
t
cyc
Ǔ
* 1 w
ǒ
0
10
Ǔ
* 1 w * 1
W_SETUP ) W_STROBE w
t
DS
(m)
t
cyc
* 1 w
ǒ
20
10
Ǔ
* 1 w 1
W_HOLD w max
ǒ
t
CLH
(m)
t
cyc
,
t
ALH
(m)
t
cyc
,
t
CH
(m)
t
cyc
,
t
DH
(m)
t
cyc
Ǔ
* 1 w
ǒ
10
10
Ǔ
* 1 w 0
W_SETUP ) W_STROBE ) W_HOLD w
t
WC
(m)
t
cyc
* 3 w
ǒ
80
10
Ǔ
* 3 w 5
Use Cases
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Inserting these values into the equations defined above allows you to determine the values for SETUP,
STROBE, HOLD, and TA. For a read:
Therefore with a 10 nS margin added in, R_SETUP ≥ 1.0, R_STROBE ≥ 6.5, and R_HOLD ≥ 0.
After solving for R_HOLD, TA may be calculated:
Adding a 10 ns margin, TA ≥ 2.
For a write:
Therefore with a 10 nS margin added in, W_SETUP ≥ 0, W_STROBE ≥ 6, and W_HOLD ≥ 1.
46
Asynchronous External Memory Interface (EMIF) SPRUEQ7C–February 2010
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