PSB21391 Datasheet, PDF (51/253 Pages) Infineon Technologies AG – Siemens Codec with UPNTransceiver

PSB 21391
PSB 21393
Interfaces
2.2.3 Serial Data Strobe Signal and strobed Data Clock
For time slot oriented standard devices connected to the IOM-2 interface the SCOUT
provides two independent data strobe signals SDS1 and SDS2. The SDS2 function is
shared with the RSTO function at pin RSTO/SDS2, therefore the SDS2 functionality
must be selected by setting the RSS bits in the MODE1 register to ’01’.
Instead of a data strobe signal a strobed IOM bit clock can be provided on pin SDS1 and
SDS2.
2.2.3.1 Serial Data Strobe Signal
The two strobe signals can be generated with every 8-kHz frame and are controlled by
the registers SDS1/2_CR. By programming the TSS bits and three enable bits
(ENS_TSS, ENS_TSS+1, ENS_TSS+3) a data strobe can be generated for the IOM-2
time slots TS, TS+1 and TS+3 and any combination of them.
The data strobes for TS and TS+1 are always 8 bits long (bit7 to bit0) whereas the data
strobe for TS+3 is always 2 bits long (bit7, bit6).
Figure 23 shows three examples for the generation of a strobe signal. In example 1 the
SDS is active during channel B2 on IOM-2 whereas in the second example during IC1
and IC2. The third example shows a strobe signal for 2B+D channels which is used e.g.
at an IDSL (144kbit/s) transmission.
Data Sheet
41
2001-03-07