Chapter 2 General Description
© National Instruments Corporation 2-7 VXI-MXI User Manual
• Interrupt Circuitry This circuitry generates and receives interrupt
requests on the VMEbus, the MXIbus, and on
boards plugged into the daughter card connectors.
Interrupt requests routed between VXIbus
mainframes can be transparently serviced by
interrupt handlers in VXIbus mainframes other
than the requester's own mainframe.
• Parity Check and Generation This circuitry checks and generates MXIbus
parity.
• A32, A24, A16 and LA Windows These address windows assign portions of the
MXIbus address space to the VXIbus mainframe
and vice versa.
• VXI-MXI Configuration Registers These registers provide all the configuration
information required by the VXI-MXI and are
accessible from both the VXIbus and the MXIbus.
• MXIbus Master Mode State Machine This state machine converts VXIbus cycles
mapped out of a MXIbus window to the MXIbus
into MXIbus cycles.
• MXIbus Slave Mode State Machine This state machine converts MXIbus cycles
mapped through a MXIbus window into the
VXIbus mainframe into VXIbus cycles.
• MXIbus Address/Data and Address These transceivers and associated circuitry control
Modifiers Transceivers the direction of the MXIbus address and data
lines. When a VXIbus transfer is mapped out to
the MXIbus, the VXIbus address/data lines are
multiplexed into the MXIbus address/data lines.
When a MXIbus transfer is mapped into the
VXIbus, the MXIbus address/data lines are
demultiplexed into separate VXIbus address and
data lines.
• MXIbus System Controller Functions If the VXI-MXI is the MXIbus System Controller,
this circuitry provides the MXIbus arbiter,
interrupt daisy-chain generation, and the MXIbus
System Controller timeout logic.
• MXIbus Control Signals Transceivers These transceivers control the direction of the
MXIbus control signals.
• MXIbus Requester and Arbiter Circuitry This circuitry is used to request the MXIbus when
a VXIbus transfer is mapped into a MXIbus
window.
• Daughter Card Connection The two daughter card connectors can be used to
add additional functionality to the VXI-MXI in
the form of plug-in daughter cards.