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參數(shù)資料
| 型號： | PCSYSCON |
| 英文描述： | PC(ISA)BUS I/O CARD |
| 中文描述： | 電腦（ISA）總線的I / O卡 |
| 文件頁數(shù)： | 23/36頁 |
| 文件大?。?/td> | 383K |
| 代理商： | PCSYSCON |
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Section 5. Circuit Description
The board address is selected by IC21, an 8-bit comparator, and part
of IC8. This IC, a PAL, also takes in various control signals buffered
by IC14. It generates the enable signal for IC5, the data bus buffer,
and strobe signals for IC19 and 13, which then decode pointer
addresses for the counters and registers. It also generates strobe
signals for IC6 and IC9, which holds the board identification, and IC7
which controls the green LED.
The DAC IC31 outputs are compared with the three supply rails by
IC33 and with the temperature sensor IC28. IC10,11 and 12 hold the
mask bits for the three mask registers, and IC16,17 and 18 allow
these to be read back and compared with the input signals. Alarm
signals from these ICs go to IC20 which drives the relay, buzzer and
interrupts, to IC24 which is the STATUS buffer and to IC4 which
buffers them onto the 50-way connector PL2. IC26 compares input
analogue signals and also the ramp from the watchdog timing
capacitor. The two watchdog times are selected by choosing which
voltage to switch at. Digital input is via IC3 and output is from IC2.
2192-09065-000-000
Section 5. Circuit Description
Page 23
J278 PCSYSCON
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