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IA8237 Datasheet(PDF) 2 Page - InnovASIC, Inc

Part No. IA8237
Description  Programmable DMA Controller
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Maker  INNOVASIC [InnovASIC, Inc]
Homepage  http://www.innovasic.com
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IA8237
Advanced Information Sheet
Programmable DMA Controller
Copyright
© 1999, InnovASIC Inc.
Customer Specific IC Solutions
The IA8237 is a programmable direct memory access (DMA) mega-function designed to be
functionally equivalent to the Intel 8237A and Harris 82C37A devices. The A8237 controls data
transfers between memory and peripherals, memory-to-memory transfers, and block memory
initialization. Four independently programmable channels are available, and requests may be
generated via hardware or software.
A block diagram is shown in Figure 1.
Functional Block Diagram
Figure 1
TIMING
AND
CONTROL
ADSTB
MEMR_n
MEMW_n
IOR_n
IOW_n
CS_n
READY
CLK
AEN
EOP_n
RESET
PRIORITY
ENCODER
AND
ROTATING
PRIORITY
LOGIC
HDLA
HRQ_n
DREQ0_n :
DREQ3_n
DACK0 :
DACK3
COMMAND
MASK
REQUEST
DECREMENTOR
TEMP WORD
COUNT REG
INC/DECREMENTOR
TEMP ADDRESS
REG
BASE
ADDRESS
BASE
WORD
COUNT
READ BUFFER
CURRENT
ADDRESS
CURRENT
WORD
COUNT
READ WRITE BUFFER
WRITE
BUFFER
READ
BUFFER
IO
BUFFER
TEMPORARY
STATUS
MODE
READ
WRITE
COMMAND
CONTROL
OUTPUT
BUFFER
IO
BUFFER
A0 : A3
A4 : A7
DB0 : DB7
16
16
INTERNAL DATA
BUS




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