h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 172

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

6.6.13
When burst mode is selected on the DRAM interface, the DACK output timing can be selected
with the DDS bit in DRAMCR. When DRAM space is accessed in DMAC single address mode at
the same time, this bit selects whether or not burst access is to be performed.
When DDS = 1: Burst access is performed by determining the address only, irrespective of the
bus master. With the DRAM interface, the DACK output goes low from the T
Figure 6.42 shows the DACK output timing for the DRAM interface when DDS = 1.
Rev. 2.00, 03/04, page 140 of 534
φ
Address bus
Data bus
Figure 6.41 Example of Timing when Precharge Time after Self-Refreshing is Extended
(
(
(
,
)
DMAC Single Address Transfer Mode and DRAM Interface
)
)
Software
standby
T
rc3
by 2 States
T
rp1
T
rp2
T
p
DRAM space write
T
r
c1
T
state.
c1
T
c2