PEF 20550 H V2.1 Infineon Technologies, PEF 20550 H V2.1 Datasheet - Page 60

• 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

If the data transfer is initiated via the proper command, the SACCO automatically
requests the correct amount of block data transfers (n
by activating the DRQT-line.
Refer to chapter 2.2.7.2 for a detailed description of the DMA transfer timing.
2.2.7.4 Protocol Support
The SACCO supports the following fundamental HDLC functions:
– Flag insertion/deletion,
– Bit stuffing,
– CRC-generation and checking,
– Address recognition.
Further more it provides six different operating modes, which can be set via the MODE
register. These are:
– Auto Mode,
– Non-Auto Mode,
– Transparent Mode 0 and 1,
– Extended Transparent Mode 0 and 1.
These modes provide different levels of HDLC processing. An overview is given in
figure 35.
.
Figure 35
Support of the HDLC Protocol by the SACCO
Semiconductor Group
Flag
SACCO
User
Address
Control
I-
Field
60
CRC
32 + remainder, n = 0, 1, 2, …)
Flag
ITD08035
Functional Description
Auto Mode
Non-Auto Mode
Transparent Mode 1
Transparent Mode 0
Extended Transparent
Mode
PEB 20550
PEF 20550
01.96