peb20560 Infineon Technologies Corporation, peb20560 Datasheet - Page 134
peb20560
Manufacturer Part Number
peb20560
Description
Dsp Oriented Pbx Controller Doc
Manufacturer
Infineon Technologies Corporation
Datasheet
1.PEB20560.pdf
(433 pages)
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Semiconductor Group
2.8
2.8.1
The PEDIU gives the DSP access possibility to 64 down-stream PCM B-channels, that
come from the two ELICs, and the possibility to drive upstream 64 PCM B-channels that
go back to the ELICs. In general, the PEDIU feeds a bidirectional circular buffer with
B-channels. They are written into the buffer by the PEDIU and read by the DSP in
downstream direction, and written into the buffer by the DSP and read out by the PEDIU
in the upstream direction.
A possible flow of B-channels between ELIC1 and PEDIU Port1 is demonstrated as an
example in Figure 2-39:
• The B-channel B1 coming from IOM-2 interface on DU00 is switched by ELIC1 via
• The B-channel B2 coming from PCM highway on the RXD0 line is switched by ELIC1
• The PEDIU reads the B-channels, B1 and B2, in.
• The PEDIU writes the B-channels B3 and B4 out on the DU11 line.
• ELIC1 switches B3 to the IOM-2 interface on DD00 via its internal loop.
• ELIC1 switches B4 via TXD0 to the PCM highway.
Note: Every above ELIC loop utilizes one time-slots on the PCM highway (i.e. B1* and
The PEDIU is connected with both ELICs: With Port0 of ELIC0 and with Port1 of ELIC1.
internal loop to CFI Port1 DD11 line. Each loop requires one time-slot on the PCM
highway (B*).
to CFI Port1 DD11 line.
B3*). If the ELIC is programmed to be in high impedance state during those
time-slots, they (B1* and B3*) can be used for other purpose (e.g. for signaling by
a SACCO).
PCM-DSP Interface Unit (PEDIU)
General Description
2-88
Functional Block Description
PEB 20560
2003-08
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