HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 275

• Manufacturer Part Number: HD6412373R
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

• RAS Up Mode
φ
Address bus
RASn (CSn)
UCAS, LCAS
RD
OE
Data bus
Note: n = 2 to 5
To select RAS up mode, clear the RCDM bit to 0 in DRAMCR. Each time access to DRAM
space is interrupted and another space is accessed, the RAS signal goes high again. Burst
operation is only performed if DRAM space is continuous. Figure 6.33 shows an example of
the timing in RAS up mode.
Figure 6.33 Example of Operation Timing in RAS Up Mode
T
Row address
p
DRAM space read
T
r
(RAST = 0, CAST = 0)
Column address 1 Column address 2
T
c1
T
c2
Rev.7.00 Mar. 18, 2009 page 207 of 1136
T
DRAM space
c1
read
Section 6 Bus Controller (BSC)
T
c2
External address
Normal space
T
1
REJ09B0109-0700
read
T
2