Description

MVIP302 Technical Specifications

1. EIA-232-D Communication Interface

1.1 Signal Level & Components

Level Conversion: EIA-232-D communication levels are implemented by CMOS MC14C88 transmitters and MC14C89 receivers.
Supported Signals: Each EIA-232-D channel supports 5 signals:
- Transmit Data (TxD)
- Receive Data (RxD)
- Ready-To-Send (RTS)
- Clear-To-Send (CTS)
- Ground
Receiver Biasing: MC14C89 receivers are nominally biased at 1.5 volts, enabling reception of various input signal levels without additional interface circuitry (see Figure 1-2).
Power Protection: Protection diodes are integrated in the ±12V supply lines, allowing connection to powered equipment even when the IndustryPack is unpowered.

2. Interrupt & DMA Support

2.1 Interrupt Function

Vectored Interrupts: Fully supported with a shared 8-bit vector register.
Interrupt Mapping:
- Channels a, b, c, d: Interrupt on IRQ0
- Channels e, f, g, h: Interrupt on IRQ1

2.2 DMA Function

Supported Channels: DMA is only available for channels c and d.
Limitation: If DMA is enabled, the Request-To-Send (RTS) lines on channels c and d become unavailable.

3. Control & Access

3.1 Control Component

The IndustryPack is controlled by a single CMOS 22V10-type PAL.

3.2 Physical Connection

Connected via a standard 50-conductor ribbon cable.

3.3 Address Access

Data Width & Alignment: MVIP302 and MVIP303 are accessed via 8-bit bytes at odd addresses only.
Address Space: Typically accessed in the I/O space.
Register Maps: See Table 2-1 (MVIP302) and Table 2-2 (MVIP303) for register mappings. All addresses are offsets relative to the IndustryPack (IP) I/O base address, which is configured on the IP carrier board.

4. Channel Wiring & Functional Options

4.1 Channel Wiring

Signal Configuration: Each channel has 5 EIA-232-D lines, with identical wiring at the 50-pin connector:
1. Ground
2. Transmit Data (output)
3. Receive Data (input)
4. Ready-To-Send (output)
5. Clear-To-Send (input)
Ground Connection: A common ground line for all channels is connected to the local logic ground.

4.2 Functional Flexibility

The two modem control lines (RTS and CTS) can be reconfigured for alternative modem/terminal control functions or used as general-purpose I/O.

5. Additional I/O Features

5.1 Pullup Resistor

A 1KΩ pullup resistor to +12V is available on pin 42. It can be externally connected to assert a “Mark” (true) signal to an EIA-232-D line.

5.2 General-Purpose Inputs

Quantity & Pinout: 8 general-purpose input lines (non-EIA-232 levels) are provided on pins 43–50.
Interface Type: Unbuffered CMOS logic inputs directly connected to the SCC2698B.
Functional Options: Programmable as general-purpose inputs or external inputs for counter/timer.
Switching Threshold: TTL levels (nominal 1.5 volts).

MVIP302 PDF
MVIP302

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