HFC-S2M Cologne Chip AG, HFC-S2M Datasheet - Page 94

• Manufacturer Part Number: HFC-S2M
• Description: Isdn HDLC Fifo Controller With Primary Rate Interface
• Manufacturer: Cologne Chip AG

HFC-E1
3.1 Data flow concept
The HFC-E1 has a programmable data flow unit, in which the FIFOs are connected with the
PCM and the E1 interface. Moreover the data flow unit can directly connect PCM and E1
interface or two PCM time slots
The fundamental features of the HFC-E1 data flow are as follows:
The complete HFC-E1 data flow block diagram is shown in Figure 3.1. Basically, data rout-
ing requires an allocation number at each block. So there are three areas where numbering
is based on FIFOs, HFC-channels and PCM time slots.
FIFO handling and HDLC controller, PCM and E1 interface are described in Chapters 4
to 6. So this chapter deals with the data flow unit which is located between and including the
channel assigner, the PCM slot assigner and the E1 slotassigner.
Term definitions
Figure 3.2 clarifies the relationship and the differences between the numbering of FIFOs,
HFC-channels and PCM time slots. The inner circle symbolizes the HFC-channel oriented
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interface
interface
host
host
1
In this data sheet the shorter expression “slot” instead of “time slot” is also used with the same meaning.
programmable interconnection capability between FIFOs, PCM time slots and E1 time
slots
in transmit and receive direction there are
3 data flow modes to satisfy different application tasks
subchannel processing for bitwise data handling
– up to 32 FIFOs
– 16, 32 or 64 PCM time slots
– 32 E1 time slots
– 32 HFC-channels to connect the above-mentioned data interfaces
controller
controller
FIFO
FIFO
transparent
transparent
controller
controller
HDLC
HDLC
HDLC
HDLC
data
data
FIFO
or
or
Figure 3.1: Data flow block diagram
1
.
assigner
assigner
channel
channel
Data Sheet
Data flow
subchannel
subchannel
processor
processor
decomposition
decomposition
construction /
construction /
HFC-channel
HFC-channel
byte
byte
channel
controller
controller
flow
flow
March 2003 (rev. A)
E1 interf.
E1 interf.
PCM slot
PCM slot
assigner
assigner
assigner
assigner
slot
Cologne
Chip
interface
interface
interface
interface
PCM
PCM
E1
E1