Rev. 1.0, 09/01, page 155 of 904
T
h
Address bus
ø
T
1
T
2
T
3
T
t
Bus cycle
Data bus
,
Write
Data bus
Read
(when
RDNn = 0)
Read data
Write data
Figure 6.20 Example of Timing when Chip Select Assertion Period is Extended
Both extension state T
h
inserted before the basic bus cycle and extension state T
t
inserted after the
basic bus cycle, or only one of these, can be specified for individual areas. Insertion or non-
insertion can be specified for the T
h
state with the upper 8 bits (CSXH7 to CSXH0) in the CSACR
register, and for the T
t
state with the lower 8 bits (CSXT7 to CSXT0).
6.6
DRAM Interface
In this LSI, external space areas 2 to 5 can be designated as DRAM space, and DRAM interfacing
performed. The DRAM interface allows DRAM to be directly connected to this LSI. A DRAM
space of 2, 4, or 8 Mbytes can be set by means of bits RMTS2 to RMTS0 in DRAMCR. Burst
operation is also possible, using fast page mode.
6.6.1
Setting DRAM Space
Areas 2 to 5 are designated as DRAM space by setting bits RMTS2 to RMTS0 in DRAMCR. The
relation between the settings of bits RMTS2 to RMTS0 and DRAM space is shown in table 6.4.
Содержание H8S/2376 F-ZTAT
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