The MA3690/1 chip set has three modes of operation: remote terminal, bus controller, and passive monitor It has a dual bus capability, requires minimum support hardware / software and is implemented on a radiation hard, CMOS/SOS process. For applications requiring access to Terminal Flag, a 48-Pin DIL MA3693 is available as an alternative to the MA3690.
As a remote terminal, the MA3690/1 is fully compatible with Mil-Std-1553B. The chip set obtained SEAFAC approval in December 1987. All options and mode commands specified by the Mil Std are implemented Full and meaningful use is made of status word bits and a comprehensive bit word is provided.
A unique mechanism has been incorporated that allows the subsystem to declare illegal commands legal, and vice versa, before the chip set services the command. It should be noted that use of this mechanism is optional and that the system defaults to normal operation if the option is not required. The chip set is easily interfaced to subsystem memory and is sufficiently flexible to ensure compatibility with a wide range of microprocessors.
As a bus controller the MA3690/1 has the ability to initiate all types of 1553B transfer on either of the two buses An instruction word is set up by the subsystem, prior to transmission, which contains details of transfer type and bus selection. Four bits of the instruction word have been used to specify the conditions under which the chip set will generate a subsystem interrupt. The most significant bits of the instruction word have been used to specify the conditions under which the chip set will perform an automatic retry and the number of retries to be carried out (max. 3). At the end of each instruction execution cycle, the chip set writes a report word into the subsystem memory; the contents of which give the subsystem an indication of the degree of success of the transfer.
The bus controller may be used in either of two configurations, i.e. single shot or table driven.
In the single shot configuration, the controller is under direct control from the subsystem (processor). In table driven configuration, the controller is given greater autonomy to execute a table of instructions held in either ROM or RAM.
As a passive monitor, the chip set will monitor all bus activity and pass any associated information to the subsystem. As the name implies, in this mode of operation, the chip set is truly passive and will not reply to command instructions.

*Radiation Hard to 1MRads (Si)
*High SEU Immunity, Latch-Up Free
*CMOS-SOS Technology
*All Inputs and Outputs Fully TTL or CMOS Compatible
*Military Temperature Range -55 to +125°C
*Dual Bus Capability
*Minimal Subsystem Interface
*Powerful Bus Control Facility
*Complete Remote Terminal Protocol
*SEAFAC Approved

MA3691, MA3693, MAS3690CL, MAR3690CL, MAS3691CLMAR3691CL

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