PEB20570FV31XP Lantiq, PEB20570FV31XP Datasheet - Page 113

• Manufacturer Part Number: PEB20570FV31XP
• Manufacturer: Lantiq

Specifications of PEB20570FV31XP

• Lead Free Status / Rohs Status: Compliant

4.3.2
Figure 33
4.3.2.1
The main task of the IOMU is the serial-to-parallel conversion of incoming IOM-2 data to
a parallel data format which is directly read by the DSP. This access is required for the
DSP to perform switching of B-channels, extraction of D-channels, and layer-1 control
via the IOM-2 C/I and Monitor channels.
The data conversion in the IOMU is done by frame-wise swapping based on a circular
buffer structure. During each 8 kHz frame, one buffer is assigned to the IOMU (I-buffer),
and the other one to the DSP (D-buffer). At the end of every frame, the buffers are
swapped.
4.3.2.2
The logical partitioning of each frame buffer into input and output blocks is determined
according to the requested data rate as shown in the table below.
Data Sheet
IOM-2 Interface
D.C/I M
D.C/I M
B1 B2 M D,C/I
B1 B2 M D,C/I
IOM-2000
Interface
B2 B1
B2 B1
DRDY
IOMU Functional and Operational Description
Frame-Wise Buffer Swapping
DSP Inaccessible Buffer (I-buffer) Logical Structure
DCL
FSC
IOMU Integration in DELIC
DU1
DU0
DD0
DD1
DELIC
IOM-2000
IOMU
96
CLOCKS
SWITCHING
DSP
Functional Description
HDLCU
PCMU
PEB 20570
PEB 20571
2003-07-31
PCM
Interface