Chapter 2
Analog Input Timing/Control
DAQ-STC Technical Reference Manual
2-22
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National Instruments Corporation
LOCALMUX_CLK*
O4TU
Configuration FIFO Advance Clock—This output clocks the
local configuration FIFO containing the scan list, thereby
updating the channel, gain, and channel configuration
selections. The LOCALMUX_CLK pulse is asserted on
CONVERT and remains asserted based on the selected
pulsewidth, with the added condition that SOC must arrive
before the signal is deasserted. When an external multiplexer
is present, the LOCALMUX_CLK signal can be configured
to pulse only after every n conversions, where n is determined
by the value in the 16 bit DIV counter. This is useful when an
external multiplexer is used to switch more than one active
channel into a channel in the scan list. Output polarity is
selectable. Destination: Configuration FIFO. Options: Active
Low, Active High, Ground, High Z. Related bitfields:
AI_LOCALMUX_CLK_Output_Select,
AI_LOCALMUX_CLK_Pulse,
AI_LOCALMUX_CLK_Pulse_Width,
LOCALMUX_FFRT*
O9TU
Configuration FIFO Retransmit—This output indicates that
the configuration FIFO should repeat the scan list. When
MUXFEF is active, the LOCALMUX_FFRT signal is
asserted on the trailing edge of LOCALMUX_CLK and
remains asserted based on the selected pulsewidth. Output
polarity is active low. Destination: Configuration FIFO.
Related bitfields: AI_LOCALMUX_CLK_Pulse_Width.
MUXFEF
IU
Configuration FIFO Empty Flag—This input indicates that
the configuration FIFO is empty. The MUXFEF signal is used
to generate the configuration FIFO retransmit signal
(LOCALMUX_FFRT). The input polarity is selectable.
Source: Configuration FIFO. Related bitfields:
AI_FIFO_Flags_Polarity.
Table 2-1.
Pin Interface (Continued)
Pin Name
Type
Description
