Envision Peripherals NV3128 manual Crosspointarchitecture

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CROSSPOINTARCHITECTURE

Figure 1.5 is a simplified representation of the interface between the I/O connectors, the dynamic ports, and the crosspoint matrix. The crosspoint matrix itself consists of four LSI 64x64 crosspoint chips connected in a unidirectional 128x128 “m by n” architecture. In this non-blocking scheme, any of the 128 inputs can be switched to any of the 128 outputs. Each output is controlled by a double-buffered register with a load and an active segment. Upon receipt of an XY take command, the command interpreter fills the load segment with the address of the input port to which the output will be connected. The take is consummated when the crosspoint strobe dumps the contents of the load registers into the active registers. The entire process of mapping the switch in this fashion occurs within one video vertical retrace time.

At the crosspoint level, the NV3128 is an X-Y matrix switch. But from the vantage point of the user, the semantics of routing architecture break down: the straightforward concepts of input and output, sufficient to describe program route matrices, no longer have meaning. Despite the complexity, inherent in the dynamic ports is an expanded capability. Unlike a program router, which has a fixed I/O dimension, each of the 128 ports can be connected to any other port. Each of the ports can be either source or destination.

For each requested machine connection, the router uses the input command information to ensure that the controlling machine automatically sees a controlled router port, and that the controlled machine looks back into a controlling port. In practice, this means that the NV3128 can dynamically implement the connections of Fig. 1 and Fig 3 in successive sessions. In Fig. 1.1, the editor controls VTR A, which is a controlled device. In a further session, VTR A dubs down to VTR B, with VTR A now a controlling device, as shown in Fig.

1.3.In a conventional routing switch, this arrangement would require physical re-connecting of the machines involved. Although there are routing systems with high-impedance outputs that can be forced into such a mapping, the cost is a doubling of the number of connections, a 4-times expansion of the number of crosspoints, and associated increments in operating costs.

NV3128 RS-422A Machine-Control Data Switch

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Contents Nvision PrintingHistory WarrantyStatement TechnicalSupport ImportantSafeguardsandNotices Page Page NorthAmericanPowerSupplyCords Tableofcontents Page Generalinformation NV3128 RS-422A Machine-Control Data Switch Generalinformation GeneralArchitecture Background NV3128 RS-422A Machine-Control Data Switch NV3128 RS-422A Machine-Control Data Switch NV3128 RS-422A Machine-Control Data Switch Solution Dynamic Ports Crosspointarchitecture NV3128 RS-422A Machine-Control Data Switch Multidrop Command Chains PhysicalSystem Specifications Ancillary Equipment1NV3128SPECIFICATIONS Installation NV3128 RS-422A Machine-Control Routing Switch Chapter TWO Installation NV3128 RS-422A Machine-Control Routing Switch Frame Installation Universal Control or Command Interpreter Partitioning ObsoletePartition DIP Switches Obsolete Settings RE-INITIALIZE BIT/MULTIDROP Enable s7Matrix Control II Jumpers Obsolete Input Length s8-s5RS-422A RS-232 Configuring the Diagnostic Interface Obsolete Parallel Interface ObsoleteJumper Enabled Disabled Configuring the Reference Input Reference Input Ground ObsoleteCabling the Serial Command Interface Cabling the NV3128PIN RS232 Obsolete RS-232 DCE VS. DTE Decision ObsoletePIN Connector Adding a Redundant Controller Implementing HOT Changeover ObsoletePC Diagnostic Interface UNIDIAG/NVUTILS Cabling CompleteRear Connections NEW Frame Rear Ections OLD Frame Rearconnections OLD Frame PC-BASED Software Installation Obsolete InstallationGeneral NvtakeSoftware Installation Fixed Disk Sample Install SessionHardware Configuration Operation from a Floppy DiskOperation NV3128 RS-422A Machine Control Data Routing Switch Operations Connection NotesPOINT-TO-POINT Connection Rules Multidrop Connection RulesComputer Utilities Obsolete Operating Instructions Nvtake Obsolete InvocationOperations F3 Change Router LevelF1 Sending a Single Take F9 Build a Salvo Table F10 Load a Salvo from Disk F2 Send a SalvoF5 Query Multiple Connections F6 List Destinations Connected to a SourceOperating Instructions Nvmap Obsolete OperationNV3128 RS-422A Machine Control Data Routing Switch Screen NV3128 RS-422A Machine Control Data Routing Switch Theoryofoperation NV3128 RS-422A Machine-Control Data Routing Switch System Control StructureNV3128 RS-422A Machine-Control Data Routing Switch 1 I/O Connector Interface Signal BackplaneCircuit Operation Assy EM0038-XXCrosspoint Module Assy EM0041-XX Input DataCrosspoints Output Data4 I/O Assembly EM0040-XX Mapping Parallel Interface Command Interpreter only Power RegulationAsynchronous Timing PartitioningPower Supply Assy PS2001-XX NV3128 RS-422A Machine-Control Data Routing Switch NV3128 RS-422A Machine-Control Data Routing Switch Maintenanceand Troubleshooting NV3128 RS-422A Machine Control Data Routing Switch Reliability Scheduled MaintenanceCustomer Support Power TroubleshootingIsolating Faults Signal Path Mapping and Command ProblemsNV3128 RS-422A Machine Control Data Routing Switch Glossary NV3128 RS-422A Machine-Control Data Routing Switch AES/EBU MOV Vcxo NV3128 RS-422A Machine-Control Data Routing Switch Index NV3128 RS-422A Machine-Control Data Switch Index-2 Index NV3128 RS-422A Machine-Control Data Switch Index-4 NV3128 RS-422A Machine-Control Data Switch Index-5 NV3128 RS-422A Machine-Control Data Switch Index-6