Texas Instruments TMS320DM646X DMSOC User Manual
Page 38
R_SETUP
)
R_STROBE
w
ǒ
t
EM_A
)
t
ACC
(m)
)
t
SU
)
t
EM_D
Ǔ
t
cyc
*
1
w
(0.27
)
12
)
5
)
0.45)
10
*
1
w
0.78
R_SETUP
)
R_STROBE
)
R_HOLD
w
t
RC
(m)
t
cyc
*
3
w
ǒ
12
10
Ǔ
*
3
w *
1.8
R_HOLD
w
ǒ
t
H
*
t
EM_D
*
t
OH
(m)
*
t
EM_A
Ǔ
t
cyc
*
1
w
(0
*
0.45
*
3
*
0.27)
10
*
1
w *
1.37
TA
w
ǒ
t
EM_CS
)
T
COD
(m)
)
t
EM_D
Ǔ
t
cyc
*
1
w
(0.36
)
7
)
0.45)
10
*
1
w *
0.22
W_STROBE
w
t
WP
(m)
t
cyc
*
1
w
ǒ
8
10
Ǔ
*
1
w *
0.2
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
max
ǒ
(0.36
)
0
*
0.27)
10
,
(0.36
)
0
*
0.45)
10
Ǔ
*
1
w *
0.92
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
max
ǒ
(0.27
)
9
*
0.36)
10
,
(0.45
)
7
*
0.36)
10
Ǔ
*
1
w *
0.1
W_SETUP
)
W_STROBE
)
W_HOLD
w
t
WC
(m)
t
cyc
*
3
w
ǒ
12
10
Ǔ
*
3
w *
1.8
Use Cases
www.ti.com
Inserting these values into the equations defined above allows you to determine the values for SETUP,
STROBE, HOLD, and TA. For a read:
Therefore if R_SETUP = 0, then R_STROBE = 0, R_HOLD = 0, and TA = 0.
For a write:
Therefore, W_SETUP = 0, W_STROBE = 0, and W_HOLD = 0.
38
Asynchronous External Memory Interface (EMIF)
SPRUEQ7C – February 2010
Copyright © 2010, Texas Instruments Incorporated