
Rev. 1.0, 09/01, page 129 of 904
6.3.9 DRAM Access Control Register (DRACCR)
DRACCR is used to set the DRAM/synchronous DRAM interface bus specifications.
Note: *The synchronous DRAM interface is not supported in the H8S/2378 series.
Bit Bit Name Initial Value R/W Description
15 DRMI 0 R/W Idle Cycle Insertion
An idle cycle can be inserted after a
DRAM/synchronous DRAM access cycle when
a continuous normal space access cycle follows
a DRAM/synchronous DRAM access cycle. Idle
cycle insertion conditions, setting of number of
states, etc., comply with settings of bits ICIS2,
ICIS1, ICIS0, and IDLC in BCR register
0: Idle cycle not inserted
1: Idle cycle inserted
14
−
0
R/W
Reserved
This bit is always read as 0. The initial value
should not be changed.
13
12
TPC1
TPC0
0
0
R/W
R/W
Precharge State Control
These bits select the number of states in the
RAS precharge cycle in normal access and
refreshing.
00: 1 state
01: 2 states
10: 3 states
11: 4 states
11 SDWCD 0 R/W CAS Latency Control Cycle Disabled during
Continuous Synchronous DRAM Space Write
Access
Disables CAS latency control cycle (Tcl)
inserted by WTCRB (H) settings during
synchronous DRAM write access (see figure
6.5).
0: Enbles CAS latency control cycle
1: Disables CAS latency control cycle
10 — 0 R/W Reserved
This bit is always read as 0. The initial value
should not be changed.
Содержание H8S/2376 F-ZTAT
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