500-004941-000
4-8
board Fail LED bit is initialized ON. Detailed bit maps of the CSR are shown in
Tables 4.4-1, 4.4-2, 4.4-3, AND 4.4-4.
4.4.1
Built-in-Test Programming
The relay configuration shown in Figure 3.1-1 is designed for board
testing. Activating the TEST MODE relay connects all R/D converter modules to the
P2 connector so the user may apply a test signal for board level testing.
For normal R/D operation, CSR bits 24, 25, 26 and 27 are set to enable
the resolver inputs, via the front panel connector, to be connected to their
respective R/D converter modules. See Tables 4.4-4 and 4.4.1-1 for the function of
each relay control bit in the CSR.
CAUTION
RELAY CONTROL BITS 24, 25, 26 AND 27 SHOULD
NEVER
BE SET WHEN THE
TEST MODE BIT (BIT 28) IS SET. FAILURE TO HEED THIS PROGRAMMING NOTE
MAY RESULT IN DAMAGE TO THE VMIVME-4941 BOARD. THE PROBLEM CAN BE
CAUSED BY THE SIMULTANEOUS CONNECTION OF MORE THAN ONE VOLTAGE
SOURCE TO THE CONVERTER INPUT. NOTE THAT THE RELAY DROPOUT TIME
IS ONE MILLISECOND, MAXIMUM.
4.4.2
Fail LED Control
Controls front panel Fail LED. Setting the bit to a "zero" will turn the Fail
LED ON. Setting the bit will turn the LED OFF.
4.4.3
R/D Converter Resolution Control
The CSR also allows the user to select each resolver-to-digital channel
as specified in Tables 4.1-2, 4.4-3, and 4.4-4. Each converter may be programmed
as shown in the following matrix to select the desired resolution:
CONTROL BIT*
XB XA
RESOLUTION (BITS)
0 0
10
0 1
12
1 0
14
1 1
16
*X = Channel number 0, 1, 2, or 3.
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