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Hitachi H8S/2633 Hardware Manual page 208

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(1) Operation Timing for Burst Access (High-Speed Page Mode)
Figure 7-22 shows the operation timing for burst access. When the DRAM space is successively
accessed, the CAS signal and column address output cycle (2 state) are continued as long as the
row address is the same in the preceding and succeeding access cycles. The MXC1 and MXC0
bits of the MCR specify which row address is compared.
CS n (RAS)
CAS, LCAS
HWR (WE)
Read
CAS, LCAS
HWR (WE)
Write
Note: n=2 to 5
OE* is enabled when OES=1.
Figure 7-22 Operating Timing in High-Speed Page Mode
The bus cycle can also be extended in burst access by inserting wait states. The method and timing
of inserting the wait states is the same as in full access. For details, see Section 7.5.8, "Wait
Control."
182
T
p
ø
A23 to A0
AS
OE *
D15 to D0
OE
D15 to D0
T
T
T
r
c1
row
column1
RCTS= 0
RCTS= 1
T
T
c2
c1
c2
column2

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