zl50021 Zarlink Semiconductor, zl50021 Datasheet - Page 76

• Manufacturer Part Number: zl50021
• Description: Enhanced 4 K Digital Switch With Stratum 3 Dpll
• Manufacturer: Zarlink Semiconductor

External Read/Write Address: 004B
Reset Value: 0000
15 - 8
6 - 5
4 - 2
Bit
15
7
0
14
0
PMS2 - 0
PRS1 - 0
Unused
Name
MTR
H
13
0
Reserved. In normal functional mode, these bits MUST be set to zero.
MTIE Reset: When this bit is low, the MTIE circuit applies a phase offset between the
reference input clock and the DPLL output clock and the phase offset value is
maintained. When this bit is high, MTIE circuit is in its reset state and the phase offset
value is reset to zero, causing alignment of the DPLL output clocks to nearest edge of the
selected input reference.
Preferred Reference Selection Bits: These bits select the preferred reference from one
of the input references They are used only if the PMS2-0 bits are set to 001. Otherwise,
these bits are ignored
Preference Mode Selection Bits: These bits select one of the preference modes:
If in automatic mode with a preferred reference (PMS2-0 = 001 and FDM1-0 = 00), the
automatic state machine will only switch between two references (as per Table 8). Please
see Section 12.1.3.2, “Automatic Reference Switching With Preference“ on page 41 for
more details.
12
Table 40 - Reference Change Control Register (RCCR) Bits
0
H
11
0
PMS2
10
0
0
0
0
1
1
0
PRS1
9
.
0
110 - 111
Zarlink Semiconductor Inc.
0
0
1
1
PMS1
0
0
1
1
0
0
ZL50021
8
0
PRS0
76
0
1
0
1
PMS0
MTR
7
0
1
0
1
0
1
Description
PREFERRED REFERENCE
PRS
6
1
Preference as per the setting of
SELECTION
PREFERENCE MODE
PRS
5
0
the PRS1 - 0 bits
REF0
REF1
REF2
REF3
No Preference
Force REF0
Force REF1
Force REF2
Force REF3
Reserved
PMS
4
2
PMS
3
1
PMS
2
0
Data Sheet
FDM
1
1
FDM
0
0