HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 368

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

Figure 10.17 shows the TEND output timing.
To execute a long word access to an 8-bit or 16-bit external device or to execute a word access to
an 8-bit external device, the DACK and TEND outputs are divided for data alignment as shown in
figure 10.18.
Rev. 1.00, 02/04, page 330 of 804
Figure 10.17 Example of DMA Transfer End Signal Timing in Cycle Steel Mode Level
Figure 10.16 Example of DREQ Input Detection in Burst Mode Level Detection
CKIO
Bus cycle
DREQ
DACK
TEND
CKIO
CKIO
Bus cycle
DREQ
(Overrun 0 at
high level)
DACK
(Active-high)
Bus cycle
DREQ
(Overrun 1 at
high level)
DACK
(Active-high)
DMAC
1st acceptance
1st acceptance
CPU
CPU
Non sensitive period
Non sensitive period
CPU
Detection
CPU
CPU
End of DMA transfer
DMAC
2nd acceptance
DMAC
DMAC
Acceptance
start
CPU
2nd acceptance
Acceptance
start
3rd
acceptance
DMAC
Acceptance
start
CPU