s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 298

• Manufacturer Part Number: s3c4510b
• Description: 16/32-bit Risc Microcontroller
• Manufacturer: Samsung Semiconductor, Inc.

HDLC CONTROLLERS
HDLC DATA ENCODING/DECODING
Data encoding is utilized to allow the transmission of clock and data information over the same medium. This
saves the need to transmit clocks and data over a separate medium as would normally be required for
synchronous data. The HDLC provides four different data encoding methods, selected by bits in HCON1[18:16].
An example of these four encoding methods is shown in figure 8-5.
8-12
NRZ, NRZI Type
FM0/FM1/Manchester type
(Biphase Space)
(Biphase Mark)
Manchester
RxClock
RxClock
TxClock
TxClock
NRZI
Data
NRZ
Data
Data
FM1
FM0
1
Figure 8-5. Data Encoding Methods and Timing Diagrams
1
0
0
1
0
Bit Cell Level:
High = 1
Low = 0
No Change = 1
Change = 0
Bit Center Transition:
Transition = 1
No Transition = 0
No Transition = 1
Transition = 0
High
Low
Low = 1
High = 0
S3C4510B