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參數(shù)資料
| 型號(hào)： | PCPIC |
| 英文描述： | PC(ISA)BUS I/O CARD |
| 中文描述： | 電腦（ISA）總線的I / O卡 |
| 文件頁(yè)數(shù)： | 29/40頁(yè) |
| 文件大?。?/td> | 468K |
| 代理商： | PCPIC |
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2192-09155-000-000
J230 PCPIC
Page 29
Section 5. Circuit Description
The board address is selected by IC11, an 8-bit comparator, and part
of IC21. This IC, a PAL, also takes in various control signals buffered
by IC16. It generates the enable signal for IC4, the data bus buffer,
and strobe signals for IC25, which then decode pointer addresses for
the counters and registers. It also generates strobe signals for IC26
and IC27, which holds the board identification, and IC24 which
controls the green LED.
The configuration of the I/O section is controlled by IC14, the board
control register. Two bits from this go to IC20, the interrupt control
PAL, and three bits go to IC15 and IC14 which are the gate control
flip-flop PALs. Outputs from these PALs control IC17, which can let
the timebase signal through into the counter gates. Two of the bits
from IC12 also control IC19 and 18, which feed either the timebase
or signals from group 0 into the counter clock inputs. IC8 are the
group 1 and 2 input buffers and IC10 is the group 3 output latch.
The 5MHz crystal oscillator output is fed to dividers IC28 and 29.
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| PCPKITIW | 功能描述:電線導(dǎo)管 Pan Pole Replacement Parts Kit (includes RoHS:否 制造商:Panduit 類型:Slotted SideWall Open finger design wiring cut 材料:Polypropylene 顏色:Light Gray 大小: 最大光束直徑: 抗拉強(qiáng)度: 外部導(dǎo)管寬度:25 mm 外部導(dǎo)管高度:25 mm |
| PCPL-17B | 制造商:PMA 功能描述:20MM POLY. BLK CONT. PACK |
| PCPLHK | 功能描述:ANT SUB YAGI 10-13 ELEMENT KIT RoHS:是 類別:RF/IF 和 RFID >> RF 天線 系列:* 標(biāo)準(zhǔn)包裝:1 系列:* |
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