HD6412373R RENESAS [Renesas Technology Corp], HD6412373R Datasheet - Page 270

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

Section 6 Bus Controller (BSC)
6.6.10
When DRAM with a ×16-bit configuration is connected, the 2-CAS access method is used for the
control signals needed for byte access. Figure 6.28 shows the control timing for 2-CAS access,
and figure 6.29 shows an example of 2-CAS DRAM connection.
Rev.7.00 Mar. 18, 2009 page 202 of 1136
REJ09B0109-0700
φ
Address bus
RASn (CSn)
UCAS
LCAS
WE (HWR)
OE (RD)
Upper data bus
Lower data bus
Note: n = 2 to 5
Byte Access Control
(Upper Byte Write Access: RAST = 0, CAST = 0)
Figure 6.28 2-CAS Control Timing
T
p
Row address
High
High
T
r
T
c1
Column address
High impedance
Write data
T
c2