HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 320
HD6417706
Manufacturer Part Number
HD6417706
Description
Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417706.pdf
(709 pages)
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Even if the priority is set in the fixed mode or in the round-robin mode, it will not give the bus to
the CPU since channel 1 is in the burst mode. This example is illustrated in figure 9.16.
9.4.5
Number of Bus Cycle States: When the DMAC is the bus master, the number of bus cycles is
controlled by the bus state controller (BSC) in the same way as when the CPU is the bus master.
For details, see section 8, Bus State Controller (BSC).
DREQ
DREQ
DREQ
DREQ Pin Sampling Timing: In the external request mode, the DREQ pin is sampled by clock
pulse (CKIO) falling edge or low level detection. When DREQ input is detected, a DMAC bus
cycle is generated and DMA transfer is performed, at the earliest, three states later.
The second and subsequent DREQ sampling operations are started two cycles after the first
sample.
Rev. 4.00, 03/04, page 274 of 660
Figure 9.16 Bus State when Multiple Channels are Operating (Priority Level is Round-
Notes:
CPU
Number of Bus Cycle States and DREQ
CPU
1. Cycle-steal mode
2. Burst mode
DMAC
CH1
DMAC CH1
Burst mode
DMAC
CH1
DMAC
CH0
*
1
DMAC CH0 and CH1
Round-robin mode in
robin Mode)
DREQ Pin Sampling Timing
DREQ
DREQ
DMAC
CH1
*
2
DMAC
CH0
*
1
DMAC
CH1
DMAC CH1
Burst mode
DMAC
CH1
CPU
CPU
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