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PDF UM8237A-5 Data sheet ( Hoja de datos )

Número de pieza UM8237A-5
Descripción Programmable DMA Controller
Fabricantes UMC 
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eUMC
UM8237A/ 8237A-4/ 8237A-5
Programmable DMA
Controller (DMAC)
Features
• Enable/Disable control of individual DMA requests
• Four independent DMA channels
• Independent autoinitialization of all channels
• Memory-to-memory transfers
• Memory block initialization
• Single 5V power supply
• High performance: transfers up to 1.6M bytes/second
with 5MHz 8237A-5
• Directly expandable to any number of channels
• End of process input for terminating transfers
• Software DMA requests
• Independent Polarity control for DREQ and DACK
signals
• Available in EXPRESS
- Standard Temperature Range
General Description
The UM8237A Direct Memory Access Controller (DMAC)
is a peripheral interface circuit for microprocessor systems.
It is designed to improve system performance by allowing
external devices to directly transfer information from the
system memory. Memory-tb-memory' transfer capability
is also provided. The LJ M8237A offers a wide variety of
programmable control features to enhance data throughput
and system optimization and to allow dynamic reconfi-
guration under program control.
UM8237 A is fabriqlted in Si-Gate NMCS process with each
channel has a fuil 64K address and word count capability.
The 8237A-4 and 8237A-5 are 4 MHz and 5 MHz selected
versions of the standard 3 MHz 8237A respectively.
Pin Configuration
Block Diagram
TOR
lOW
MEMR
MEMW
MARK
READY
HlDA
ADSTB
AEN
HRO
cs
ClK
RESET
DACK2
DACK3
DRE03
DRE02
DREOl
DREOO
(GND) VSS
A7
A6
A5
A4
EOP
A3
A2
Al
AO
VDP
DBO
DBl
DB2
DB3
DB4
DACKO
DACKl
DB5
DB6
DB7
EOP
RESET
cs
READY
CLOCK
ADSTB
MEMR
MEMW
TOR
lOW
MLDA
7-142

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