r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 272

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 6 Bus Controller (BSC)
6.7.13
DMAC and EXDMAC Single Address Transfer Mode and DRAM Interface
When burst mode is selected on the DRAM interface, the DACK and EDACK output timing can
be selected with the DDS and EDDS bits in DRAMCR. When DRAM space is accessed in DMAC
or EXDMAC single address mode at the same time, these bits select whether or not burst access is
to be performed.
(1)
When DDS = 1 or EDDS = 1
Burst access is performed by determining the address only, irrespective of the bus master. With
the DRAM interface, the DACK or EDACK output goes low from the T
state.
c1
Figure 6.53 shows the DACK or EDACK output timing for the DRAM interface when DDS = 1 or
EDDS = 1.
Rev. 1.00 Sep. 19, 2008 Page 242 of 1342
REJ09B0467-0100