HD6417615 Hitachi Semiconductor, HD6417615 Datasheet - Page 518

• Manufacturer Part Number: HD6417615
• Description: Hardware Manual
• Manufacturer: Hitachi Semiconductor

Figure 11.38 DREQn Pin Input Detection Timing in Cycle-Steal Mode with Level Detection
Figure 11.39 When a 16-Bit External Device is Connected (Level Detection)
(Active high)
(Active high)
Bus cycle
DREQn
(Active high)
(Active high)
DACKn
Clock
Bus cycle
DREQn
DACKn
Clock
1st
acceptance
(Byte/Word/Longword Setting)
CPU
1st
acceptance
CPU
Blind zone
CPU
Blind zone
CPU
DACK
H
DMAC
H
Requests acceptable
2nd
acceptance
DACK
DMAC
DMAC
L
L
2nd
acceptance
Blind zone
Blind zone
CPU
503