PEB20571 INFINEON [Infineon Technologies AG], PEB20571 Datasheet - Page 118

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

Preliminary Data Sheet
4.7
4.7.1
The GHDLC (General HDLC) controls the dedicated serial communication interface of
the DELIC. The purpose of the GHDLC is to decode incoming HDLC messages and to
encode outgoing messages according to the HDLC protocol. The GHDLC transceives
HDLC data streams with up to 16.384 Mbit/s. A received message is collected bit by bit
from the line and stored as octets in the Receive buffer and read by the DSP. A
transmitted message which is placed by the DSP as octets in the Transmit buffer, is
transmitted bit by bit over the line.
.
Figure 4-12 Data Processing in the GHDLC
4.7.2
The GHDLC line interface may be connected to other ICs in three different ways:
• Point-to-point
• Point-to-multi-point
• Multi-slave
4.7.3
The GHDLC provides three main modes of operation:
• HDLC Mode: In this mode flag recognition/insertion, zero deletion/insertion and CRC
• Asynchronous Mode: This mode is used with request-to-send / clear-to-send
DSP
Double
Buffer
DSP
Double
Buffer
decoding/encoding are performed.
handshaking. In this mode data is transmitted at a very slow rate of up to 300 baud
and controlled directly by the DSP.
GHDLC Unit
GHDLC Overview
GHDLC Channel External Configurations
GHDLC General Modes
status and interrupt vector
Transmit Buffer
Receive Buffer
command vector
set-up vectors
4-34
Processing
Processing
Transmit
Receive
Functional Description
data out to line
data in from line
bit by bit
bit by bit
DELIC
2003-08
LTxD
LRxD