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DP8459 데이터시트(PDF) 13 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 DP8459
상세설명  All-Code Data Synchronizer
PDF  35 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8459 데이터시트(HTML) 13 Page - National Semiconductor (TI)

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FIGURE 12.
FIGURE 13. Control Register
FIGURE 14. Microwire Compatible Control Register Serial Load Timing Diagram
SYNCHRONIZATION FIELD MATCHING DIVIDER
The Synchronization field Matching Divider is a programmable
modulus counter employed for implementation of the preamble
frequency lock function. It is placed in the VCO feedback path
to match the relative frequency of the VCO seen at the Phase
Comparator to the frequency of the ENCODED READ DATA
(preamble)
during
the
read
operation
whenever
the
FREQUENCY LOCK CONTROL input is active (logic-zero).
The modulus of the divider, M, is determined by the states of
the SYNC PATTERN SELECT 0 and 1 inputs, as defined by
the table in
Figure 15 .
FIGURE 15. SYNC PATTERN SELECT Input Truth Table
Prior to the assertion of READ GATE, the divider is held in a
known count state and is enabled at the end of the zero phase
TL/F/9322-1
TL/F/9322-15
TL/F/9322-10
Sync Pattern
Sync Matching
Expected
Code
Select
Divider Modulus
Preamble
10
M
0
0
1
GCR
0
1
2
MFM; 1,N
1
0
3
2,7
1
1
4
2,7
http:\\www.national.com
13
PrintDate=1996/07/31 PrintTime=11:05:52 ds009322 Rev. No. 1
Proof
13



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