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DP8459 Scheda tecnica(PDF) 13 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte DP8459
Spiegazioni elettronici  All-Code Data Synchronizer
PDF  35 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8459 Scheda tecnica(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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