pef20550 Infineon Technologies Corporation, pef20550 Datasheet - Page 323
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pef20550
Manufacturer Part Number
pef20550
Description
Extended Line Card Interface Controller Elic
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEF20550.pdf
(407 pages)
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PEF 20550
Application Hints
5.7
Synchronous Transfer Utility
The synchronous transfer utility allows the synchronous exchange of information
between the PCM interface, the configurable interface, and the P interface for two
independent channels (A and B). The P can thus monitor, insert, or manipulate the data
synchronously to the frame repetition rate. The synchronous transfer is controlled by the
synchronous transfer registers.
The information is buffered in the synchronous transfer data register STDA (STDB). It is
copied to STDA (STDB) from a data or control memory location pointed to by the content
of the synchronous receive register SARA (SARB) and copied from the STDA (STDB)
to a data or control memory location pointed to by the content of the synchronous
transfer transmit register SAXA (SAXB).
The SAXA (SAXB) and SARA (SARB) registers identify the interface (PCM or CFI) as
well as the timeslot and port numbers of the involved channels according to figure 84.
Control bits in the synchronous transfer control register STCR allow restricting the
synchronous transfer to one of the possible sub-timeslots and enables or disables the
synchronous transfer utility.
For example, it is possible to read information via the downstream data memory from the
PCM interface input to the STDA (STDB) register and to transmit it from this register
back via the upstream data memory to the PCM interface output, thus establishing a
PCM - PCM loop. Similarly the synchronous transfer facility may be used to loop back
configurable interface channels or to establish connections between the CFI and PCM
interfaces. While the information is stored in the data register STDA (STDB), it may be
read and or modified by the P.
Semiconductor Group
323
01.96
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