PEF2054NV21XK Lantiq, PEF2054NV21XK Datasheet - Page 106

• Manufacturer Part Number: PEF2054NV21XK
• Manufacturer: Lantiq

Specifications of PEF2054NV21XK

• Lead Free Status / Rohs Status: Compliant

If DCL and FSC are selected as clock and framing signal source (CMD1:CSS = 1),
the CFI reference clock CRCL is obtained out of the DCL input signal after division by 1,
1.5 or 2 according to the prescaler selection (CMD1:CSP1 … 0). The CFI frame
structure is synchronized by the FSC input signal. Note that although the frequency and
phase of DCL and FSC may be chosen almost independently with respect to the
frequency and phase of PDC and PFS, the CFI clock source must still be synchronous
to the PCM interface clock source i.e. the two clock sources must always be derived from
one master clock. This mode must be selected if it is impossible to derive the required
CFI data rate from the PCM clock source. An overview of the different possibilities to
generate the PCM and CFI data and clock rates for CMD1:CSS = 1 is given in figure 31.
Figure 30
EPIC
Semiconductor Group
DCL
FSC
®
Clock Sources for the CFI and PCM Interfaces if CMD1:CSS = 0
C
F
CMD2
I
*
Internal Reference
Clock (RCL)
Only CFI
Modes
M
U
X
CMD2 FC2
CFI Frame Sync.
CFI Data Rate
FC Modes 0-7
:
COC
*
:
0 and 3
x2
...0
CFI Mode
CFI Mode
2
1
0
3
2
1
0
3
Bit Shift
CTAR
CBSR: CDS2...0
2
2
4
CRCL
EPIC
106
R
CMD1 CSP1,
M
M
M
U
U
X X
U
X
Bit Shift
POFU
POFD
PCSR
:
1.5
2
0
PMOD PCR
PCM Frame Sync.
PCM Data Rate
M
U
X
:
Application Hints
2
ITS09547
PEB 2055
PEF 2055
C
M
P
PDC
PFS