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S3C2500B
8.7.9 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.
Registers
0×F0100020
HPRMBA
0×F0110020
HPRMBB
0×F0120020
HPRMBC
31
30
29
28
27
The reference for the preamble pattern of each data mode is as follows:
Table 8-16. HPRMBA and HPRMBB Register
Address
R/W
R/W
R/W
R/W
26
25
24
23
22
21
20
19
[1:0] Preamble pattern
Figure 8-20. HDLC Preamble Constant Register
Table 8-17. Preamble Reference Pattern
Data Mode
NRZ
NRZI
FM0
FM1
MANCHESTER
Description
HDLC Preamble Constant Register
HDLC Preamble Constant Register
HDLC Preamble Constant Register
18 17
16
15
14
13 12
11
Preamble Pattern
AA
00
FF
00
AA
HDLC CONTROLLER
10 9
8
7
Preamble Pattern
Reset Value
0x00000000
0x00000000
0x00000000
0
8-47
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