R0K572115S000BE Renesas Electronics America, R0K572115S000BE Datasheet - Page 365

• Manufacturer Part Number: R0K572115S000BE
• Description: KIT STARTER FOR SH7211
• Manufacturer: Renesas Electronics America
• Series: Renesas Starter Kits (RSK)r
• Type: Microcontrollerr

Specifications of R0K572115S000BE

• Contents: CPU Board, LCD Display Module, E8 Emulator, Cable, QuickStart Guide and CD-ROM
• For Use With/related Products: SH7211
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

(b)
In single address mode, both the transfer source and destination are external devices, either of
them is accessed (selected) by the DACK signal, and the other device is accessed by an address. In
this mode, the DMAC performs one DMA transfer in one bus cycle, accessing one of the external
devices by outputting the DACK transfer request acknowledge signal to it, and at the same time
outputting an address to the other device involved in the transfer. For example, in the case of
transfer between external memory and an external device with DACK shown in figure 9.7, when
the external device outputs data to the data bus, that data is written to the external memory in the
same bus cycle.
Two kinds of transfer are possible in single address mode: (1) transfer between an external device
with DACK and a memory-mapped external device, and (2) transfer between an external device
with DACK and external memory. In both cases, only the external request signal (DREQ) is used
for transfer requests.
Figure 9.8 shows an example of DMA transfer timing in single address mode.
Single Address Mode
This LSI
Figure 9.7 Data Flow in Single Address Mode
DMAC
External address bus
DACK
DREQ
External data bus
Data flow (from memory to device)
Data flow (from device to memory)
Rev. 3.00 Mar. 04, 2009 Page 339 of 1168
External device
with DACK
External
memory
REJ09B0344-0300