HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 51
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HD64570
Manufacturer Part Number
HD64570
Description
Serial Communications Adaptor
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD64570.pdf
(469 pages)
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1.7.12
The SCA has a built-in bus arbiter for arbitrating the bus between the on-chip DMAC and an
external bus master device. This bus arbiter provides an easy way to design a multi-channel
system using two or more SCA chip (figure 1.23). The circuit shown here merely represents the
concept of the multi-channel system. In practice, the user system should be designed while
referring to the bus arbitration sequence (figure 3.6).
MPU
BUSACK BUSREQ
BUSACK
BUSREQ BUSY
Bus Arbiter
SCA
HD64180,
etc.
Figure 1.23 Daisy-Chained Multi-Channel System (example)
BEO
Glue logic
BUSACK
BUSREQ BUSY
SCA
BEO
BUSACK
BUSREQ BUSY
SCA
BEO
Rev. 0, 07/98, page 35 of 453
BUSACK
BUSREQ BUSY
SCA
BEO
+ 5 V
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