DMV11 Synchronous Controller

The DMV11 Synchronous Controller (more fully, the DMV11 Intelligent Communications Synchronous Line Controller) is a multi-line synchronous serial line interface for the QBUS. It used DMA to transfer data. It could operate in either half-duplex or full-duplex, at baud rates up to 56K bits/second (depending on software and system configuration), and supported both point-point and multi-point operation.

The byte-oriented DDCMP line protocol was supported; a microprocessor is used to implement the protocol.

It was a quad card; Berg headers on the card connected to flat cables which led off to the modem connectors. There were 4 models, the -AP, -BP, and -FP used the M8053 card, and the -CP used the M8064. (Earlier, there were 3 models; the -AA, -AB, and -AC.) They supported the following interface standards:

Model	Interface
-AP	EIA RS-232C/CCITT V.28
-BP	CCITT V.35
-CP	Integral modem
-FP	EIA RS-423A/CCITT V.24

Registers

Register	Abbreviation	Address
Control and Status Register	SEL0	16xxx0
Control/Response Code Register	BSEL2	16xxx2
Tributary Address	BSEL3	16xxx3
Command/Response Register	SEL4	16xxx4
Command/Response Register	SEL6	16xxx6

Addresses are assigned from the floating device address space.

See also

• DUV11 Line Interface
• DPV11 synchronous serial line interface

External links

• EK-DMVQM-UG-001 QMA DMV11 Synchronous Controller User's Guide
• EK-DMV11-TM-001 DMV11 Synchronous Controller Technical Manual