Texas Instruments TMS320C6745 DSP - Timing Waveform of an ASRAM Write with PCB Delays

1
Setup
2
Strobe
3
Hold
4
EMA_CS[n]
EMA_CS[n] (ASRAM)
EMA_A[x:0]/
EMA_BA[1:0]
EMA_A[x:0]/
EMA_BA[1:0] (ASRAM)
EMA_WE
EMA_WE (ASRAM)
EMA_D[x:0]
EMA_D[x:0] (ASRAM)
t
EMA_CS
t
EMA_CS
t
EMA_A
t
WC
(m)
t
WR
(m)
t
EMA_A
t
WP
(m)
t
EMA_WE
t
AW
(m)
t
EMA_WE
t
EMA_D
t
DS
(m)
t
EMA_D
t
DH
(m)
W_SETUP ) W_STROBE ) W_HOLD w
t
WC
(m)
t
cyc
* 3
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 ≥
max
t
EM_A
t
AW
(m) t
EM_WE
t
cyc
,
t
EM_D
t
DS
(m) t
EM_WE
t
cyc
- 2
( )
( ) ( )
+
-
+
-
W_STROBE w
t
WP
(m)
t
cyc
* 1
Example Configuration www.ti.com
746
SPRUH91D–March 2013–Revised September 2016
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External Memory Interface A (EMIFA)
Figure 18-26. Timing Waveform of an ASRAM Write with PCB Delays