zl50019gag2 Zarlink Semiconductor, zl50019gag2 Datasheet - Page 66

• Manufacturer Part Number: zl50019gag2
• Description: Enhanced 2 K Digital Switch With Stratum 4e Dpll
• Manufacturer: Zarlink Semiconductor

15 - 10
Reset Value: 16B1
External Read/Write Address: 0042
15 - 0
Reset Value: 029F
External Read/Write Address: 0043
9 - 0
CFN
Bit
Bit
15
15
15
0
CFN
14
14
CFN15 - 0
CFN25 - 16
14
0
Unused
Name
Name
H
H
CFN
13
13
13
0
Table 30 - Centre Frequency Register - Lower 16 Bits (CFRL)
CFN
Table 31 - Centre Frequency Register - Upper 10 Bits (CFRU)
Center Frequency Number (CFN) Lower 16 Bits: The total binary value of these bits
and the CFRU register bits defines the output center frequency number according to the
following formula:
where, f
clock. For given master clock frequency of 100 MHz, and desired output center fre-
quency of 65.536 MHz, the CFN has the value of:
The register contents should be changed only if compensation for input oscillator (or
crystal) frequency offset is required.
e.g., if master clock frequency is off by +20 ppm (100.002 MHz -> 5 times multiplied c20i
of 20.0004 MHz), the CFN should be programmed to be:
The default value of this register SHOULD NOT be changed in any other circumstances.
12
12
12
Reserved. In normal functional mode, these bits MUST be set to zero.
Center Frequency Number (CFN) Upper 10 Bits: The total binary value of these bits
and the CFRL register bits represents the center frequency number (CFN) explained
under CFRL register bits explanation.
The default value of this register should be changed only if compensation for input oscil-
lator (or crystal) frequency offset is required, and SHOULD NOT be changed in any other
circumstances.
0
H
H
CFN
11
11
OUT
11
0
CFN
is desired output center frequency, while f
CFN
CFN
10
10
10
0
=
=
2
26
2
CFN
26
CFN
9
×
9
Zarlink Semiconductor Inc.
25
9
---------------------------------- -
100.002MHz
×
65.536MHz
65.536MHz
------------------------------ -
ZL50019
100MHz
CFN
CFN
8
8
24
8
66
CFN
f
CFN
7
7
OUT
23
=
7
=
Description
2
2
Description
26
=
26
CFN
CFN
----------- -
CFN
×
6
6
2
22
×
6
26
0.65534689
0.65536
×
CFN
f
CFN
MCLK
5
5
21
5
=
MCLK
CFN
43980465
=
CFN
4
4
20
4
43979585
is frequency of DPLL master
CFN
CFN
3
3
19
3
=
29F16B1
=
CFN
29F1341
CFN
2
2
18
2
H
Data Sheet
CFN
H
CFN
1
1
17
1
CFN
CFN
0
0
16
0