Motorola MVME761-001, Installation And Use Manual

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3-1
3
3 Functional Description
Introduction
This chapter provides information on MVME761 transition module and
SIM circuitry, P2 signal multiplexing, and the configuration of the serial
ports.
Circuitry
The MVME761 transition module and the Serial Interface Modules
(SIMs) convert the TTL level signals to and from the MVME260x,
MVME270x, MVME360x, and MVME460x modules to the reception and
transmission levels specified by the appropriate port interface standard.
The MVME761 transition module contains a small amount of “house
keeping” circuitry. Bulk capacitors are on the power sources (+5Vdc,
+12Vdc, and -12Vdc). Pullup resistors put the inputs to the MVME260x,
MVME270x, MVME360x, and MVME460x in a known high even when
no SIM is installed.
The block diagram for the MVME761 transition module is shown in
Figure 3-1 . The block diagram for the 3-row DIN backplane P2 adapter is
shown in Figure 3-2 . The block diagram for the 5-row DIN backplane P2
adapter is shown in Figure 3-3 .