HD6417144 RENESAS [Renesas Technology Corp], HD6417144 Datasheet - Page 244

• Manufacturer Part Number: HD6417144
• Description: 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

10. Direct Memory Access Controller (DMAC)
DREQ
DREQ
Note: With cycle-steal and dual address operation, sampling timing is the same regardless of
DREQ
Rev.4.00 Mar. 27, 2008 Page 200 of 882
REJ09B0108-0400
DREQ
DRAK
DACK
DRAK
DACK
DRAK
DACK
DRAK
DACK
cycle
cycle
cycle
cycle
Bus
Bus
Bus
Bus
CK
CK
CK
CK
Figure 10.17 Cycle Steal, Single Address and Level Detection (Normal Operation)
Figure 10.16 Cycle Steal, Single Address and Level Detection (Fastest Operation)
Figure 10.15 Cycle Steal, Dual Address and Level Detection (Normal Operation)
Figure 10.14 Cycle Steal, Dual Address and Level Detection (Fastest Operation)
CPU(1)
whether DREQ detection is by level or by edge.
CPU
CPU
CPU
1st sampling
1st sampling
CPU(2)
CPU
CPU
CPU
CPU(3)
CPU
2nd sampling
CPU
DMAC(R)
2nd sampling
DMAC
DMAC(W)
CPU
DMAC
CPU(4)
CPU
DMAC(R)
DMAC(R)
DMAC
CPU
DMAC(W)
DMAC(W)
CPU(5)
CPU
DMAC
DMAC(R)
CPU
DMAC
DMAC(W)
CPU
DMAC
(R)