s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 332

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

HDLC CONTROLLERS
HDLC PREAMBLE CONSTANT REGISTER (HPRMB)
The HPRMB register is used to meet the DPLL requirements for phase-locking. The preamble pattern is
transmitted as many Tx preamble length bit values in HMODE[10:8] when the Tx preamble bit (TxPRMB) is '1',
and then the Tx preamble bit is cleared automatically. The opening flag follows this preamble pattern, and the
data will be transmitted.
The reference for the preamble pattern of each data mode is as follows:
8-46
Registers
HPRMBA
HPRMBB
31
30
29
28
27
26
25
0x7020
0x8020
Offset
MANCHESTER
24
Data Mode
Figure 8-22. HDLC Preamble Constant Register
23
Table 8-15. HPRMBA and HPRMBB Register
NRZI
NRZ
FM0
FM1
Table 8-16. Preamble Reference Pattern
22
21 20
[7:0] Preamble Pattern
R/W
R/W
R/W
19
18 17
16
HDLC Preamble Constant Register
HDLC Preamble Constant Register
15
14
13
12
Description
Preamble Pattern
11
10
AA
AA
FF
00
00
9
8
7
Preamble Pattern
6
5
4
3
2
Reset Value
0x00000000
0x00000000
1
0
S3C4510B