HD6417021 Hitachi Semiconductor, HD6417021 Datasheet - Page 215

• Manufacturer Part Number: HD6417021
• Description: SuperH RISC engine
• Manufacturer: Hitachi Semiconductor

200 HITACHI
Note: Illustrates the case when DACK is output during the DMAC write cycle.
Figure 9.15 DREQ Sampling Timing in Cycle Steal Mode (Output with DREQ level
Figure 9.16 DREQ Sampling Timing in Cycle Steal Mode (Output with DREQ level
Bus cycle
Bus cycle
DREQ
DREQ
DACK
DACK
detection and DACK active low) (Single address mode, bus cycle = 2 states)
detection and DACK active low) (Dual address mode, bus cycle = 2 states)
CK
CK
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
CPU
CPU