Envision Peripherals NV3128 User Manual download pdf (Page 68)

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

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

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.

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Envision Peripherals NV3128 User Manual Page 68