PEF2054NV21XK Lantiq, PEF2054NV21XK Datasheet - Page 38

• Manufacturer Part Number: PEF2054NV21XK
• Manufacturer: Lantiq

Specifications of PEF2054NV21XK

• Lead Free Status / Rohs Status: Compliant

The switching paths 5 and 6 can be realized by programming time slot assignments in
the control memory. The total number for such loops is limited to the number of available
time slots at the respective opposite interface, i.e. looping back a time slot from CFI to
CFI requires a spare upstream PCM time slot and looping back a time slot from PCM to
PCM requires a spare downstream and upstream CFI time slot.
3.4.3
The major tasks of the EPIC part is to dynamically switch PCM data between the serial
PCM interface, the serial configurable interface (CFI) and the parallel P interface. All
possible switching paths are shown in figure 18.
Figure 18
Switching Paths Inside the EPIC
Note: The time slot selections in upstream direction are completely independent of the
Note: The same applies for the EPIC-S with the exception that only two CFI ports are
CFI - PCM Time Slot Assignment
Switching paths 1 and 2 of figure 18 can be realized for a total number of 128 channels
(EPIC-S: 64) per path, i.e. 128 (EPIC-S: 64) time slots in upstream and 128 (EPIC-S: 64)
time slots in downstream direction. To establish a connection, the
addresses of the involved CFI and PCM time slots to the control memory. The actual
transfer is then carried out frame by frame without further P intervention.
Semiconductor Group
time slot selections in downstream direction.
provided.
Switching Functions
C
F
I
®
5
-1
3
µP Interface
38
EPIC
µP
1
2
R
4
6
ITS05844
Operational Description
P
C
M
P writes the
PEB 2055
PEF 2055