PEF 20550 H V2.1 Infineon Technologies, PEF 20550 H V2.1 Datasheet - Page 209

• Manufacturer Part Number: PEF 20550 H V2.1
• Description: IC INTERFACE CTRLR PCM MQFP80
• Manufacturer: Infineon Technologies
• Series: ELIC®r

Specifications of PEF 20550 H V2.1

• Function: Line Card Controller
• Interface: ISDN, PCM
• Number Of Circuits: 1
• Voltage - Supply: 5V
• Current - Supply: 15mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 80-SQFP
• Includes: Change Detection, Power-Up Reset Generation
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Other names: PEF20550HV2.1XT; PEF20550HV21XP; SP000007794; SP000007795

are set to logical 1 (inactive).
Note that the internal operation of the ELIC is not affected in standby mode, i.e. the
received PCM data is still written into the downstream data memory and may still be
processed by the ELIC (switched to the CFI or to the P, compared with other input line,
etc.)
In operational mode (OMDR:PSB = 1), the PCM output pins transmit the contents of the
upstream data memory data field or may be set to high impedance via the data memory
tristate field (refer to chapter 5.3.3.2).
PCM Input Comparison PMOD:AIC1 … AIC0
If the PCM input comparison is enabled, the ELIC checks the contents of two PCM
receive lines (physical ports) against each other for mismatches. (Also refer to
chapter 5.8.2).
The comparison function is operational in all PCM modes, a redundant PCM line which
can be switched over to by means of the PMOD:AIS bits is of course only available in
PCM modes 1, 2 and 3.
AIC0 set to logical 1 enables the comparison function between RxD0 and RxD1.
AIC1 set to logical 1 enables the comparison function between RxD2 and RxD3.
AIC1, AIC0 set to logical 0 disables the respective comparison function.
PCM Standby Mode OMDR:PSB
In standby mode (OMDR:PSB = 0), the PCM interface output pins TxD0 … 3 are set to
high impedance and those (TSC#) pins which are actually used as tristate control signals
Semiconductor Group
209
Application Hints
PEB 20550
PEF 20550
01.96