r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 175

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

EXDMAC address bus
Internal bus master bus acknowledge signal
Internal address bus
Internal bus master bus request signal
EXDMAC bus acknowledge signal
DMAC bus acknowledge signal
CPU bus acknowledge signal
DTC bus acknowledge signal
EXDMAC bus request signal
Legend:
ABWCR
ASTCR
WTCRAH, WTCRAL,
WTCRBH, and WTCRBL
RDNCR
CSACRH and CSACRL
BROMCRH
BROMCRL
BCR
MPXCR
DRAMCR
DRACCRH and DRACCRL : DRAM access control registers H and L
REFCR
RTCNT
RTCOR
Internal bus control signals
DMAC bus request signal
Figure 6.1 Block Diagram of Bus Controller
CPU bus request signal
DTC bus request signal
Internal data bus
Address
selector
: Bus width control register
: Access state control register
: Wait control registers AH, AL, BH, and BL
: Read strobe timing control register
: CS assertion period control registers H and L
: Area 0 burst ROM interface control register
: Area 1 burst ROM interface control register
: Bus control register
: Address/data multiplexed I/O control register
: DRAM control register
: Refresh control register
: Refresh timer counter
: Refresh time constant register
External bus
Internal bus
Control registers
BROMCRH BROMCRL
WTCRAH WTCRAL
WTCRBH WTCRBL
CSACRH
External bus controller
Internal bus controller
arbiter
ABWCR
arbiter
RDNCR
MPXCR
Area decoder
BCR
CSACRL
Rev. 1.00 Sep. 19, 2008 Page 147 of 1270
ASTCR
DRACCRH DRACCRL
Section 6 Bus Controller (BSC)
RTCNT
DRAMCR
REFCR
External bus
control signals
CS7 to CS0
WAIT
BREQ
BACK
BREQO
RTCOR
REJ09B0466-0100