Datasheet

Section 6 Bus Controller (BSC)
Rev.6.00 Mar. 18, 2009 Page 200 of 980
REJ09B0050-0600
• Normal space access after DRAM space write access
While the ICIS2 bit is set to 1 in BCR and a normal space read access occurs after DRAM
space write access, idle cycle is inserted in the first read cycle. The number of states of the idle
cycle to be inserted is in accordance with the setting of the IDLC bit. It does not depend on the
DRMI bit in DRACCR. Figure 6.53 shows an example of idle cycle operation when the ICIS2
bit is set to 1.
T
p
Address bus
φ
RD
RAS
HWR, LWR
UCAS, LCAS
External space read
Idle cycle
Data bus
T
r
T
c1
T
c2
T
1
DRAM space readDRAM space read
T
2
T
c2
T
3
T
i
T
c1
Figure 6.53 Example of Idle Cycle Operation after DRAM Write Access
(IDLC = 0, ICIS1 = 0, RAST = 0, CAST = 0)