Confidential
PMB 2349
preliminary
Functional Description
3.4.6 Fast wake-up programming
When the circuit is connected to the supply voltage all registers are undefined.
Due to the fact that each counter is loading its new start value after it is decre-
mented to „zero“, the start-up time of the counters with the programmed values
is too long for some applications. If the counters are programmed in standby
mode 2 and the PLLs are switched afterwards in operating mode, the counters
are starting immediatly with the programmed values. Therefore following data
transfer sequence is recommended:
Table 3-2 Fast Wake Up Data Transfer Sequence
Step
Serial Data Transfer Sequence
1
Long Control Word: Asynchronous Mode, Standby2
2
R-Counter
3
A-/N-Counter
4
Long Control Word: Synchronous Mode, Operating Mode
3.4.7 Phase Detector Outputs
RI
fR (RI:R)
RF1/2
fV (RF1:M)
(RF2:M)
P-Channel
CP
Tri-State
N-Channel
positive Polarity
CP
P-Channel
Tri-State
N-Channel
negative Polarity
LD
Frequency fV < fR
fV lagging
Frequency fV > fR
fV leading
The timing diagram is valid for PLL1 and PLL2.
Frequency fV = fR
lock state
Wireless Components
3 - 11
Specification, May 2000