5
5
6
6
0
0
-
-
5
5
6
6
0
0
0
0
.
.
m
m
a
a
n
n
.
.
d
d
o
o
c
c
2
2
-
-
1
1
0
0
Rev. F
f)
Interrupt Enable - Each interrupt has an associated latch that is set when
its interrupt source occurs but only if the Interrupt Enable (bit 7) is set. Since
spurious interrupt sources could occur during initialization and setup this bit
initializes in the cleared (disabled) state. This will guarantee that only interrupts
sources that occur after the bit has been set will drive the VME interrupt logic.
The BIM chip must still be programmed to enabled each interrupt and set priority
levels. For details see VME Interrupt Control in section 2.4.10.
CONFIGURATION REGISTER2 (base a hex 00A2)
This register controls the External Event active edge selection, Sync-Gen reference
code format and synchronization and the Interval output negation.
bits:
0
-
Not Used (NU)
1 - NU
2
-
Ext Event Active Edge Select
3
-
IRIG B Format (AM or DC)
4
-
Position Update Inhibit
5
-
Position Load Request
6 - Negate
Interval
7
-
GPS Time Output
8
-
NU
9
-
NU
10
-
NU
11
-
NU
12
-
NU
13
-
NU
14
-
NU
15
-
NU
a)
External Event Active Edge Select - Bit 2 selects the active edge (rising
or falling) of the signal that drives the External Event input. When this bit is a
zero the rising edge is active. A one selects the falling edge.
b)
IRIG B Format Select - Bit 3 is used when in the Code Sync-Generator
mode. The VME-SG-GPS card is capable of using either IRIG B amplitude
modulated code or IRIG B DC shift at RS-422 logic levels. When bit 3 is zero
the amplitude modulated format is used and when set DC shift is used. IRIG B
amplitude modulated is input to the VME-SG-GPS card at the front panel Code
Input BNC or at P2/J2 pin C3. The DC format is input P2/J2 pins C9 (+) and A9
(-). See section one for the P2/J2 pin description.
c)
Position Update Inhibit - Normally bit 4 is not set and position information
(latitude, longitude and elevation) are available from the GPS Engine. Position
information is read from the position registers at offset hex 90 - 9E. It may be
necessary to enter the position when multiple satellite visibility is limited due to
physical obstructions such as buildings. The card must first be placed in the
"Known" Position Mode. The updating of the position registers is inhibited by
setting bit 4. After the known position has been entered, bit 5, the Position Load
bit (described below) is set. This will enable the VME-SG-GPS card to transfer
the new position to the GPS Engine. The Position Output Disable bit and the
Position Load bit will both be cleared when the load operation has completed.
See the Loading Position description in this section 2.4.8.
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Summary of Contents for VME-SG2 560-5608
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