PEF20550HV21XT Lantiq, PEF20550HV21XT Datasheet - Page 52

• Manufacturer Part Number: PEF20550HV21XT
• Manufacturer: Lantiq

Specifications of PEF20550HV21XT

• Lead Free Status / Rohs Status: Supplier Unconfirmed

2.2.6.5 Special Functions
– Synchronous transfer.
– 7-bit hardware timer.
– Frame length checking.
– Alternative input functions.
2.2.7
The SACCO (Special Application Communication Controller) is a high level serial
communication controller consisting of two independent HDLC-channels (A + B). It is a
derivative product of the Siemens SAB 82525 (HSCX).
The SACCO essentially reduces the hardware and software overhead for serial
synchronous communication. SACCO channel A can be multiplexed by the D-channel
arbiter to serve multiple subscribers.
In the following section one SACCO channel is described referring to as "SACCO".
2.2.7.1 Block Diagram
The SACCO (one channel) provides two independent 64-byte FIFOs for receive and
transmit direction and a sophisticated protocol support. It is optimized for line card
applications in digital exchange systems and offers special features to support:
– Communication between a line card and a group controller
– Communication between terminal equipment and a line card
Semiconductor Group
This utility allows the synchronous P-access to two independent channels on the
PCM- or CFI-interface. Interrupts are generated to indicate the appropriate access
windows.
The timer can be used to cyclically interrupt the CPU, to determine the double last look
period, to generate a proper CFI-multiframe synchronization signal or to generate a
defined RESIN pulse width.
The PFS-period is internally checked against the programmed frame length.
In PCM-mode 1 and 2, the unused ports can be used for redundancy purposes. In
these modes, for every active input port a second input port exists which can be
connected to a redundant PCM-line. Additionally the two lines are checked for
mismatches.
SACCO
52
Functional Description
PEB 20550
PEF 20550
01.96