Envision Peripherals NV3128 manual CROSSPOINT MODULE ASSY EM0041-XX, Input Data, Crosspoints, Misc

4.2.3 CROSSPOINT MODULE: ASSY EM0041-XX

INPUT DATA

Input signal data flows into the crosspoint module from the signal backplane. The data is resistor coupled into buffer/driver integrated circuits, then passed onto the data bus for application to the crosspoint ICs.

Control data from the Command Interpreter arrives through the backplane and into a similar circuit. The control data contains two buses: a register bus that addresses specific crosspoint outputs and a data bus that holds the address of the input to which an output will connect.

CROSSPOINTS

The crosspoint module uses four 64x64 crossbar ICs to cross- connect any of 128 outputs with any of the 128 inputs in the crosspoint matrix. The chip’s address registers are double buffered. Control information is stored in a load register, then transferred to the active register on arrival of a strobe pulse, the signal "BNKLDI".

OUTPUT DATA

Outputs from the crosspoint chips are driven over the signal backplane to the I/O modules by 16 octal buffer/line-driver integrated circuits.

MISC:

A submodule and associated circuitry process raw DC from the power supply to produce a carefully regulated and current limited +5VDC for distribution across the module.

NV3128 RS-422A Machine-Control Data Routing Switch 4-6