The VCDS is a single-width, C-size VXI module that adapts most B size VME modules for use in a VXI mainframe. The VCDS is a functional replacement for the Colorado Data Systems Model CDS 73A-851.

The VCDS adapter maintains the VMEbus environment, timing, and backplane by buffering the VME address bus, data bus, and control signals and routing them to the installed VME module.

The VCDS supports seven interrupt levels, IRQ1 through IRQ7. The VCDS has an Interrupt Select Switch for each level on the VXIbus. The switches determine if the installed VME module will act as an interrupt handler or an interrupter, for each of the VXIbus interrupt levels.

The VCDS supports eight TTL trigger lines, TTLTRG0 through TTLTRG7. The VCDS has a TTL Trigger Direction switch for each TTL trigger line on the VXIbus. The switches indicate if the TTL trigger line will be an input to or output from the module. The VCDS also supports two ECL trigger lines, ECLTRG0 and ECLTRG1. The VCDS has an ECL Trigger Direction switch for each ECL trigger line. Trigger lines are accessed through mezzanine modules.

The VCDS has a SYSRESET Direction Switch to indicate whether the module can drive or monitor SYSRESET.