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IDT82V3285A
WAN PLL
Programming Information
111
August 7, 2009
T0_HOLDOVER_MODE_CNFG - T0 DPLL Holdover Mode Configuration
T0_HOLDOVER_FREQ[7:0]_CNFG - T0 DPLL Holdover Frequency Configuration 1
Address: 5CH
Type: Read / Write
Default Value: 010001XX
Bit
Name
Description
7
MAN_HOLDOVER
Refer to the description of the FAST_AVG bit (b5, 5CH).
6
AUTO_AVG
Refer to the description of the FAST_AVG bit (b5, 5CH).
5
FAST_AVG
This bit, together with the AUTO_AVG bit (b6, 5CH) and the MAN_HOLDOVER bit (b7, 5CH), determines a fre-
quency offset acquiring method in T0 DPLL Holdover Mode.
4
READ_AVG
This bit controls the holdover frequency offset reading, which is read from the T0_HOLDOVER_FREQ[23:0] bits
(5FH ~ 5DH).
0: The value read from the T0_HOLDOVER_FREQ[23:0] bits (5FH ~ 5DH) is equal to the one written to them.
(default)
1: The value read from the T0_HOLDOVER_FREQ[23:0] bits (5FH ~ 5DH) is not equal to the one written to them.
The value is acquired by Automatic Slow Averaged method if the FAST_AVG bit (b5, 5CH) is ‘0’; or is acquired by
Automatic Fast Averaged method if the FAST_AVG bit (b5, 5CH) is ‘1’.
3 - 2
TEMP_HOLDOVER_MODE[1:0]
These bits determine the frequency offset acquiring method in T0 DPLL Temp-Holdover Mode.
00: The method is the same as that used in T0 DPLL Holdover mode.
01: Automatic Instantaneous. (default)
10: Automatic Fast Averaged.
11: Automatic Slow Averaged.
1 - 0
-
Reserved.
Address: 5DH
Type: Read / Write
Default Value: 00000000
Bit
Name
Description
7 - 0
T0_HOLDOVER_FREQ[7:0] Refer to the description of the T0_HOLDOVER_FREQ[23:16] bits (b7~0, 5FH).
7
6
5
4
3
210
MAN_HOLDOV
ER
AUTO_AVG
FAST_AVG
READ_AVG
TEMP_HOLDO
VER_MODE1
TEMP_HOLDO
VER_MODE0
--
MAN_HOLDOVER
AUTO_AVG
FAST_AVG
Frequency Offset Acquiring Method
0
don’t-care
Automatic Instantaneous
1
0
Automatic Slow Averaged (default)
1
Automatic Fast Averaged
1
don’t-care
Manual
7
6
5
4
3
210
T0_HOLDOVER
_FREQ7
T0_HOLDOVER
_FREQ6
T0_HOLDOVER
_FREQ5
T0_HOLDOVE
R_FREQ4
T0_HOLDOVE
R_FREQ3
T0_HOLDOVE
R_FREQ2
T0_HOLDOVE
R_FREQ1
T0_HOLDOVE
R_FREQ0
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