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T
Rp1
ø
SDRAMø
CKE
PALL
NOP
REF
NOP
Address bus
T
Rp2
T
Rrw
T
Rr
T
Rc1
T
Rc2
Precharge-sel
High
Figure 6.55 Auto Refresh Timing
(TPC = 1, TPC0 = 1, RCW1 = 0, RCW0 = 1)
When the interval specification from the REF command to the ACTV cannot be satisfied, setting
the RLW1 and RLW0 bits of REFCR enables one to three wait states to be inserted in the refresh
cycle. Set the optimum number of waits according to the synchronous DRAM connected and the
operating frequency of this LSI. Figure 6.56 shows the timing when one wait state is inserted.
Содержание H8S/2376 F-ZTAT
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