HD64570F16 Renesas Electronics America, HD64570F16 Datasheet - Page 51

• Manufacturer Part Number: HD64570F16
• Description: IC SCA SRL COMM ADAPTER 88QFP
• Manufacturer: Renesas Electronics America

Specifications of HD64570F16

• Applications: ISDN
• Interface: Serial
• Voltage - Supply: 4.75 V ~ 5.25 V
• Package / Case: 88-QFP
• Mounting Type: Surface Mount
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Operating Temp Range: -20C to 75C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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