PEF2054 SIEMENS [Siemens Semiconductor Group], PEF2054 Datasheet - Page 30

• Manufacturer Part Number: PEF2054
• Description: ICs for Communications
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

The CFI reads periodically the control memory and uses the extracted values as pointers
to write to the upstream (read from the downstream) data memory (random access). In
the case of C/I- or signaling channel applications the corresponding data is stored in the
control memory. In order to select the application of choice, the control memory provides
a code portion.
The control memory is accessible via the P-interface. In order to establish a connection
between CFI time slot A and PCM-interface time slot B, the B-pointer has to be loaded
into the control memory location A.
Figure 17
EPIC
Semiconductor Group
DU#
DD#
CFI
®
-1 Memory Structure
Upstream
Downstream
Control
Memory
(CM)
127
0
DATA
8 Bits
CODE
4 Bits
127
Data Memory (DM)
0
Control
Memory
(CM)
DATA
8 Bits
127
30
0
DATA
8 Bits
µP
CODE
4 Bits
127
0
Data Memory (DM)
DATA
8 Bits
Functional Description
CODE
4 Bits
ITS05823
PEB 2055
PEF 2055
TxD#
PCM
RxD#