PEB20571 INFINEON [Infineon Technologies AG], PEB20571 Datasheet - Page 105

• Manufacturer Part Number: PEB20571
• Description: ICs for Communications
• Manufacturer: INFINEON [Infineon Technologies AG]

DELIC
PEB 20571
Functional Description
4.4
PCM Unit
PCM Interface Features
The PCMU enables the DSP to control the 4 PCM ports. The DSP accesses the
incoming PCM time slots, and prepares the outgoing PCM time slots. In general, the
PCMU enables the DSP to switch time slots from and to the PCM ports.
The basic structure and programming model of the PCMU is similar to the IOMU. Note
that the PCMU provides the double capacity of the IOMU. Thus it may handle up to
4 PCM ports and an overall of 128 time slots per frame in the receive direction and 128
time slots per frame in the transmit direction.
The following PCMU data rate modes are available:
• Four streams of 2.048 Mbit/s each (single and double clock)
• Two streams of 4.096 Mbit/s each (single and double clock)
• One stream of 8.192 Mbit/s (single and double clock)
• One stream of 16.384 Mbit/s (single clock). It is programmable, whether the first or the
second 128 time slots of the 8 kHz frame are handled in the PCMU.
Tristate control is performed via pins TSCn, programmable per time slot and port.
Preliminary Data Sheet
4-21
2003-08