HD64570F16 Renesas Electronics America, HD64570F16 Datasheet - Page 83
HD64570F16
Manufacturer Part Number
HD64570F16
Description
IC SCA SRL COMM ADAPTER 88QFP
Manufacturer
Renesas Electronics America
Datasheet
1.HD64570F16.pdf
(469 pages)
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
Available stocks
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In this sequence, after driving BUSREQ active, the SCA samples the BUSACK input from the
master MPU and the BUSY input from the other bus master at each rising edge of CLK. When the
SCA detects BUSACK low and BUSY high, it acquires control of the bus. Having acquired
control of the bus, the SCA drives BUSY (output) low at the next rising edge of CLK and begins a
DMA cycle at the next rising edge of CLK.
If the master MPU drives BUSACK high while the SCA is still requesting control of the bus, the
SCA temporarily releases control of the bus after executing the DMA cycle that began before the
rising edge of CLK at which the SCA sampled BUSACK high. Here, the SCA drives BUSY
(input) high, which indicates the end of the DMA cycles. The specific end timing of DMA cycles
varies depending on the BUSACK input timing and the number of inserted wait states.
Rev. 0, 07/98, page 67 of 453
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