Rev. 1.0, 09/01, page 228 of 904
Previous Access
Next Access
ICIS2
*
2
ICIS1
ICIS0
DRMI
IDLC
Idle cycle
0
—
—
—
—
Disabled
1
—
—
—
0
1 state inserted
Normal space read
1
2 states inserted
0
—
—
—
—
Disabled
1
—
—
—
0
1 state inserted
DRAM/continuous
synchronous
DRAM
*
1
space write
DRAM/continuous
synchronous DRAM
*
1
space read
1
2 states inserted
Notes: 1. In the H8S/2378 Series, the synchronous DRAM interface is not supported.
2. In the H8S/2378 Series, this bit is reserved and cannot be set.
Setting the DRMI bit in DRACCR to 1 enables an idle cycle to be inserted in the case of
consecutive read and write operations in DRAM/continuous synchronous DRAM space burst
access. Figures 6.81 and 6.82 show an example of the timing for idle cycle insertion in the case of
consecutive read and write accesses to DRAM/continuous synchronous DRAM space.
T
p
Address bus
Idle cycle
Data bus
T
r
T
c1
T
c2
DRAM space write
DRAM space read
T
c2
T
i
T
c1
(
)
,
(
)
(
)
Note: n = 2 to 5
Figure 6.81 Example of Timing for Idle Cycle Insertion in Case of Consecutive Read and
Write Accesses to DRAM Space in RAS Down Mode
Содержание H8S/2376 F-ZTAT
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