參數(shù)資料
型號(hào)： ID82C237
廠商： INTERSIL CORP
元件分類(lèi)： DMA控制器
英文描述： CMOS High Performance Programmable DMA Controller
中文描述： 4 CHANNEL(S), 8 MHz, DMA CONTROLLER, CDIP40
封裝： SIDE BRAZED, DIP-40
文件頁(yè)數(shù)： 16/25頁(yè)
文件大?。?/td> 158K
代理商： ID82C237
4-163
82C237
Figure 8 shows an application for a DMA system using the
82C237 DMA controller and the 80C286 Microprocessor.
In this application, the system clock comes from the 82C284
clock generator PCLK signal which is inverted to provide
proper READY setup and hold times to the DMA controller in
an 80C286 system. The Read and Write signals from the
DMA controller may be wired directly to the Read/Write con-
trol signals from the 82C288 Bus Controller. The octal latch
for A8-A15 from the DMA controller’s data bus is on the local
80C286 address bus so that memory chip selects may still
be generated during DMA transfers. The transceiver on A0-
A7 is controlled by AEN and is not necessary, but may be
used to drive a heavily loaded system address bus during
transfers. The data bus transceivers simply isolate the DMA
controller from the local microprocessor bus and allow pro-
gramming on the upper or lower half of the data bus.
FIGURE 8. 80C286 DMA APPLICATION
MEMW
MEMR
MEMCS
MEMORY
A0 - A23
IOW
DACK
I/O
IOR
SYSTEM
BUS
A
TRANSCEIVER
OE
T/R
DEVICE
DREQ
CS
D0 - D15
TRANS-
CEIVER
TRANS-
CEIVER
LATCH
STB
OE
AEN
D0-D7
V
CC
A0-A7
IOR
IOW
MEMR
MEMW
DACK 0-3
D0-D7
DREQ 0-3
EOP
AEN
ADSTB
HRQ
HLDA
CLK
READY
82C237
IOR
IOW
MEMR
MEMW
TO CORRESPONDING
82C288 SIGNALS AND
MEMORY/PERIPHERALS
D
TRANSCEIVER
LATCH
D
A
DECODE
CHIP SELECT
TO MEMORY/
PERIPHERALS
80C286
A0-A23
D0-D15
READY
HLD
HLDA
CLK
IORC
IOWC
MRDC
MWTC
IOR
IOW
MEMR
MEMW
CLK
82C288
82C284
CLK
PCLK
READY
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ID82C237-12 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:CMOS High Performance Programmable DMA Controller
ID82C284 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:Clock Generator and Ready Interface for 80C286 Processors
ID82C284-10 制造商:Harris Corporation 功能描述: 制造商:Intersil Corporation 功能描述:
ID82C284-12 制造商:Rochester Electronics LLC 功能描述:PERIPH CLK GENERATOR 5V 12.5MHZ 18CDIP IND - Bulk
ID82C37A 制造商:HARRIS 制造商全稱(chēng):HARRIS 功能描述:CMOS High Performance Programmable DMA Controller
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