HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 317
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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Bus Modes: There are two bus modes: cycle-steal and burst. Select the mode in the TM bits of
CHCR_0 to CHCR_3 (one byte, word, or longword, or 16-byte data).
(16- Byte Transfer, External Memory Space (Ordinary Memory) -> External Device with DACK)
Bus cycle
Cycle-Steal Mode
In the cycle-steal mode, the bus right is given to another bus master after a one-transfer-unit
(8-, 16-, or 32-bit unit) DMA transfer. When another transfer request occurs, the bus rights are
obtained from the other bus master and a transfer is performed for one transfer unit. When that
transfer ends, the bus right is passed to the other bus master. This is repeated until the transfer
end conditions are satisfied.
In the cycle-steal mode, transfer areas are not affected regardless of settings of the transfer
request source, transfer source, and transfer destination. Figure 9.14 shows an example of
DMA transfer timing in the cycle steal mode. Transfer conditions shown in the figure are:
Dual address mode
DREQ level detection
Figure 9.13 Example of DMA Transfer Timing in the Single Address Mode
D31 to D0
A25 to A0
DACKn
CPU
Figure 9.14 DMA Transfer Example in the Cycle-Steal Mode
CKIO
CPU
source address
Transfer
CPU
DMAC
Read
+4
DMAC
Write
Bus right returned to CPU
CPU
+8
DMAC
Read
Rev. 4.00, 03/04, page 271 of 660
+12
DMAC
Write
CPU
CPU
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