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Note:
Note:
Programming the RTSI Switch
© National Instruments Corporation
If both the A2DRV and A2RCV bits are set, the GATE1 signal is driven by
the signal OUT2. This arrangement is probably not desirable.
•
To drive the RTSI switch pin A4 with the signal OUT5, set
the A4DRV bit in Command Register 2. Otherwise, clear the
A4DRV bit.
•
To drive the signal TMRTRIG* from pin A4 of the RTSI switch,
set the A4RCV bit in Command Register 2. Otherwise, clear the
A4RCV bit.
If both the A4DRV and A4RCV bits are set, the TMRTRIG* signal is driven
by the signal OUT5.
The RTSI switch is a 7 7 crossbar switch which can be programmed to
connect any of the signals on the A side to any of the signals on the
B side and vice versa. To do this, a 56-bit pattern is shifted into the
RTSI switch by writing one bit at a time to the RTSI Switch Shift
Register and then writing to the RTSI Switch Strobe Register to load the
pattern into the RTSI switch.
The 56-bit pattern is made up of two 28-bit patterns, one for side A and
one for side B of the RTSI switch. The low-order 28 bits select the
signal sources for the B-side pins. The high-order 28 bits select the
signal sources for the A-side pins. Each of the 28-bit patterns are made
up of seven 4-bit fields, one for each pin. The 4-bit field selects the
signal source and the output enable for the pin. Figure 5-10 shows the
bit map of the RTSI switch 56-bit pattern.
5-39
Chapter 5
Programming
AT-MIO-16X User Manual
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