pef20550 Infineon Technologies Corporation, pef20550 Datasheet - Page 51

• Manufacturer Part Number: pef20550
• Description: Extended Line Card Interface Controller Elic
• Manufacturer: Infineon Technologies Corporation

2.2.6.4 Pre-processed Channels, Layer-1 Support
The EPIC-1 supports the monitor/feature control and control/signaling channels
according to SLD- or IOM-2 interface protocol.
The monitor handler controls the data flow on the monitor/feature control channel either
with or without active handshake protocol. To reduce the dynamic load of the CPU a
16-byte transmit/receive FIFO is provided.
The signaling handler supports different schemes (D-channel + C/I-channel, 6-bit
signaling, 8-bit signaling).
In downstream direction the relevant content of the control memory is transmitted in the
appropriate CFI time slot. In the case of centralized ISDN D-channel handling, a 16-kbit/
s D-channel received at the PCM-interface is included.
In upstream direction the signaling handler monitors the received data. Upon a change
it generates an interrupt, the channel address is stored in the 9-byte deep C/I FIFO and
the actual value is stored in the control memory. In 6-bit and 8-bit signaling schemes a
double last look check is provided.
.
Figure 24
EPIC
Semiconductor Group
DU#
CFI
DD#
®
-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
0
51
DATA
8 Bits
µP
CODE
4 Bits
127
0
Data Memory (DM)
DATA
8 Bits
Functional Description
CODE
4 Bits
ITS05823
PEB 20550
PEF 20550
TxD#
PCM
RxD#
01.96