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參數(shù)資料
| 型號： | IS82C237-12 |
| 廠商： | INTERSIL CORP |
| 元件分類： | DMA控制器 |
| 英文描述： | CMOS High Performance Programmable DMA Controller |
| 中文描述： | 4 CHANNEL(S), 12.5 MHz, DMA CONTROLLER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數(shù)： | 17/25頁 |
| 文件大?。?/td> | 158K |
| 代理商： | IS82C237-12 |
4-164
Figure 9 shows the data bus for a 16-bit DMA application
with the 82C237. High memory and low memory are
selected accordingly with A0 and the 8/16 signal during DMA
transfers. The 8/16 signal is formed from DWLE with a D flip-
flop and ADSTB. ADSTB must be inverted to the D flip-flop
since DWLE is set up to the falling edge of ADSTB and the
74F74 latches data on the rising edge of CLK.
The ADSTB inverted could be eliminated by using a 74F75
falling edge D latch. The latch on D8-D15 is needed for 16-
bit memory-to-memory transfers. The upper eight bits of
data are latched by MEMR during the read half of the trans-
fer. The data is then enabled onto the data bus during the
write half of the transfer.
FIGURE 9. DATA BUS FOR 16-BIT DMA APPLICATION
NOTE: Only needed for memory-to-memory transfers.
HLDA
MEMCS
FROM DECODER
8/16
STB
OE
LATCH
(SEE NOTE)
HIGH
MEMORY
D8-D15
I/O
TRANSCEIVER
DEVICE
D0 - D7
CS
I/O
DEVICE
LOW
MEMORY
CS
TRANSCEIVER
IOR
IOW
MEMR
MEMW
A0
82C237
DWLE
ADSTB
D0-D7
V
CC
CLK
74F74
D
Q
80C286
D8-D15
D0-D7
82C237
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IS82C37A | 功能描述:外圍驅(qū)動器與原件 - PCI 44 PLCC -40+85C 5 0V 8 0MHZ DMA CNTRLR RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| IS82C37A-12 | 制造商:HARRIS 制造商全稱:HARRIS 功能描述:CMOS High Performance Programmable DMA Controller |
| IS82C37A-5 | 功能描述:外圍驅(qū)動器與原件 - PCI DMA CONTROLLER IC -4 0+85C 5.0V 5.0MHZ DM RoHS:否 制造商:PLX Technology 工作電源電壓: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:FCBGA-1156 封裝:Tray |
| IS82C50A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:UART |
| IS82C50A-5 | 功能描述:UART 接口集成電路 PERIPH UART/BRG 5V 10MHZ 44PLCC IND RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
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