TM 11-6625-3081-231-24. TEST CONSOLE TEST BENCH 2A2 (cont)1-24(2) ControlSignals.Control signals from the switch controller assembly arerouted through the rear panel board and the motherboards to the quadrant controlCCAs.The relay control signals generated by each of the quadrant control CCAs arerouted through the motherboards to 16 matrix relay CCAs in each quadrant.Controlsignals are used to select the CCA and the relay and to control the relay. There are30 signal relays on each of the quadrants’ 16 matrix relay CCAs. The signal relaysare controlled from the switch controller assembly in groups of 30, each relay corre-sponds to one UUT pin; UUT pins 1 thru 30 are in quadrant 1, 31 thru 60 in quadrant 2,61 thru 90 in quadrant 3, and 91 thru 120 in quadrant 4.(3) MatrixInputs.The 16 matrix input connectors located on the matrix switchassembly rear panel are used as input/output ports to the external stimulus/measurement instruments.The connectors are numbered from 1 thru 16 corresponding tothe matrix relay CCAs in each quadrant.Any one of 16 stimulus input signals can besent to any of the 120 UUT pins.Any signal from the UUT can be sent to any of theinstruments connected to the matrix switch assembly.k.SWITCH CONTROLLER ASSEMBLY 2A2A12(1) General.The switch controller assembly 2A2A12 (FO-29) controls the matrixswitch asssembly 2A2A10 by translating computer command messages, present on the IEEE488 bus, into command and timing signals.(2) MicroprocessorandAssociatedCircuits.The switch controller assembly is amicroprocessor- driven instrument.The microprocessor control circuits are comprisedof the microprocessor, the control decoder, and the clock circuit. These circuits, in conjunction with the IEEE 488 bus handshake circuit and the interrupt gating circuits,process all commands received from the IEEE 488 bus. They perform all of the func-tions necessary to control the matrix switch assembly.(3) Bus Architecture.The switch controller assembly circuitry is implementedusing bus architecture.The major buses contained in the switch controller are:Main Data Bus (8 bits) is used to transmit data bidirectionally betweenthe microprocessor circuits and the interface circuits.Control Bus (8 bits) is used to transmit data bidirectionally between themicroprocessor circuits and the interface circuits for the control lines.Processor Bus (8 bits) connects the main data bus to the microprocessorvia the main data bus switch driver circuits.Because this bus alsoconnects to each of the ROMs that comprise the memory of the unit, thedata output from any enabled ROM is fed by this bus to themicroprocessor.ROM Address Bus (9 bits) transmits address information from themicroprocessor to the ROMs.Control-Decoder Bus consists of the four, device-select control bits fromthe microprocessor.1-160
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
