290
Chapter 7
Bus and Memory Control (BCU, MEMC)
Preliminary User’s Manual U17566EE1V2UM00
7.6.4
Write-read operation on external devices
Figure 7-16
Write-read operation
Register settings:
• BCTm.BTk0 = 0 (connected external device is SRAM or external I/O)
• ASC.ACk[1:0] = 00
B
(no address setup wait states inserted)
• DWCm.DWk[2:0] = 000
B
(no programmable data wait states inserted)
• BCC.BCk[1:0] = 00
B
(no idle states inserted)
Note
1.
The circles indicate the sampling timing.
2.
The broken line indicates the high-impedance state (bus is not driven).
The data has to be stable at the rising edge of the WR signal. For details refer
to the Electrical Target Specification.
T1
Addre
ss
D
a
t
a
WAIT (inp
u
t)
D[
3
1:0] (I/O)
WR (o
u
tp
u
t)
RD (o
u
tp
u
t)
A[2
3
:0] (o
u
tp
u
t)
BCLK
T2
T1
C
S
k (o
u
tp
u
t)
D
a
t
a
T2
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