TrueTime VME-SG2 560-5608, Руководство пользователя

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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
-
-
8
8
Rev. F
The position data is written to the position registers in the same format described above.
When this is completed the Position Load Request bit in configuration register #2, bit 5
is set. This causes the position data and current time to be formatted and transferred to
the GPS Engine. If the GPS Engine is not tracking satellites the current time information
residing in the VME-SG-GPS card must be roughly accurate (within several minutes).
Both the Load Position Request bit and the Position Update Inhibit bits will clear when
the load sequence has completed.
2.4.9 OPERATIONAL CONFIGURATION AND STATUS REGISTERS
The user has access to several registers which are used to control and read status from
the VME-SG-GPS. All of these registers are written to and read via the VME bus. The
Configuration registers are used to control all generator and synchronized generator
operations. Several registers contain position (Longitude, Latitude and Elevation) and
GPS receiver operational status. The user determines the physical address of the
registers by adding the hexadecimal offset for each register to the VME-SG-GPS base
address. Section 2.2 part A describes the VME-SG-GPS base address. The following
describes each of the configuration and status registers:
CONFIGURATION REGISTER 1 (base a hex 00A0)
This register is used to set the Operational mode, Start/Stop the Generator, enable the
Generator preset, select internal or external oscillator, and enable the interrupts.
bits: 0 - Operation Mode Select (bit 1)
1 - Operation Mode Select (bit 2)
2 - Generator Stop
3 - Generator Preset Enable
4 - External Start Enable
5 - External Oscillator Select
6 - NU (not used)
7 - Interrupt Enable
8 - NU
9 - NU
10 - NU
11 - NU
12 - NU
13 - NU
14 - NU
15 - NU
a) Mode - Bits 0 and 1 determine the operation mode as follows:
bit 2 bit 1
0 0
- Generator
0 1 - GPS Synchronized Generator
1 0 - IRIG B Synchronized Generator
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