Chapter 2
Functional Overview
© National Instruments Corporation
2-7
VME-MXI-2 User Manual
• VME-MXI-2
Registers
This logic block represents all registers on the VME-MXI-2. The
registers are accessible from either the VMEbus or MXIbus. All
registers are available in the first 4 KB of the VME-MXI-2 A24/A32
memory space, while a subset is accessible in the VME-MXI-2
VXIbus A16 configuration area.
• Onboard DRAM
SIMMs
This logic block represents the two DRAM SIMM sockets on the
VME-MXI-2. If DRAM is installed, it will be accessible in the
VME-MXI-2 A24/A32 memory space that is not mapped to registers
(above 4 KB).
• VMEbus Data
Transceivers
These transceivers ensure that the VME-MXI-2 meets the loading,
driving, and timing requirements of the VMEbus specification for the
D[31–0] signals.
• VMEbus Interrupt
and Utility Signal
Transceivers
These transceivers ensure that the VME-MXI-2 meets the loading,
driving, and timing requirements of the VMEbus specification for the
IRQ*[7–1], SYSRESET*, SYSFAIL*, and ACFAIL* signals.
• Interrupt and Utility
Signal Circuitry
This circuitry handles mapping of the interrupt and utility signals
between the VMEbus and MXIbus. The utility signals include
SYSRESET*, SYSFAIL*, and ACFAIL*. This circuitry also
generates interrupts from other conditions on the VME-MXI-2 and
allows generation of the utility signals.
• MXI-2 Interrupt and
Utility Signal
Transceivers
These transceivers ensure that the VME-MXI-2 meets the loading,
driving, and timing requirements of the MXI-2 specification for the
IRQ*[7–1], SYSRESET*, SYSFAIL*, and ACFAIL* signals.
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