HD6417034B RENESAS [Renesas Technology Corp], HD6417034B Datasheet - Page 236

• Manufacturer Part Number: HD6417034B
• Description: 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Section 9 Direct Memory Access Controller (DMAC)
Rev. 7.00 Jan 31, 2006 page 210 of 658
REJ09B0272-0700
Note: Illustrates the case when DACK is output during the DMAC read cycle.
Figure 9.14 DREQ
Figure 9.15 DREQ
Bus cycle
Bus cycle
Detection and DACK Active-Low) (Single Address Mode, Bus Cycle = 2 States)
DREQ
DACK
Detection and DACK Active-Low) (Dual Address Mode, Bus Cycle = 1 State)
DREQ
DACK
CK
CK
DREQ Sampling Timing in Cycle-Steal Mode (Output with DREQ
DREQ
DREQ
DREQ Sampling Timing in Cycle-Steal Mode (Output with DREQ
DREQ
DREQ
CPU
CPU
CPU
CPU
CPU
CPU
DMAC (R) DMAC (W)
DMAC
CPU
DMAC (W): DMAC write cycle
DMAC (R): DMAC read cycle
CPU
CPU
CPU
CPU
DREQ Level
DREQ
DREQ
DREQ
DREQ
DREQ Level
CPU
CPU