
Data Sheet
109
Rev. 1.2, 2006-01-26
QuadFALC
TM
PEF 22554 E
Functional Description E1/T1/J1
After reset the corner frequencies are 2 Hz in E1 and 6 Hz in T1/J1 mode and can be switched to 0.2 Hz in E1
mode or 0.6 Hz in T1 mode by setting the register bit LIM2.SCF for the DCO-R or the register bit CMR5.SCFX for
the DCO-X respectively. A logical table builds the integral (I) and proportional (P) parameter for the PI filter of the
If QuadFALC
compatible programming is enabled by setting the register bits CMR2.ECFAR or CMR2.ECFAX for
the DCO-R or the DCO-X respectively, the corner frequencies can be configured in a range between 2 Hz and
0.2 Hz using the register bits CMR3.CFAR(3:0) or CMR3.CFAX(3:0) respectively, see CMR3_E, CMR4_E and
CMR5_E. A logical table builds the integral and proportional parameter for the PI filter of the DCO-R or DCO-X out
of the settings in CMR3.CFAR(3:0) or CMR3.CFAX(3:0) respectively.
If additionally to CMR2.ECFAR or CMR2.ECFAX the bit CMR6.DCOCOMPN (CMR6_E) is set, which is valid for
the DCO-R and the DCO-X, the corner frequencies and attenuation factors can be programmed in a wide range
using the register bits CMR3.CFAR(3:0) and CMR4.IAR(4:0) for the DCO-R and CMR3.CFAX(3:0) and
CMR5.IAX(4:0) for the DCO-X. The settings in CMR3.CFAR(3:0)/CFAX(3:0) build the proportional parameter, the
settings in CMR4.IAR(4:0) and CMR5.IAX(4:0) build the integral parameter for the PI filters, independent from
another.
Table 15
Overview DCO-R (DCO-X) Programming
CMR6.DCOCOMPN CMR2.ECFAR
(CMR2.ECFAX)
LIM2.SCF
(CMR6.SCFX)
CMR3.CFAR(3:0)
(CMR3.CFAX(3:0))
CMR4.IAR(3:0)
(CMR5.IAX(4:0))
Corner-
frequencies
of DCO-R
(DCO-X)
E1 / T1
X
0
Not used
2 Hz / 6 Hz
X
0
1
Not used
0.2 Hz / 0.6 Hz
0
1
X
QuadFALC
compatible
programming:
7
H
4
H
Not used
0.2 Hz / 0.6 Hz
2 Hz / 6 Hz
11
X
0
H ...FH , used
as proportional
parameter
9
H
8
H
6
H
4
H
3
H
2
H
1
H
00
H ...1FH
used as integral
parameter
19
H
13
H
12
H
0F
H
0C
H
0A
H
08
H
Range 0.2 Hz
... 100 Hz
0.2 Hz
0.6 Hz
2 Hz
6 Hz
25 Hz
50 Hz
100 Hz