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DP83251 Datasheet(PDF) 40 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP83251
Description  PLAYER Device (FDDI Physical Layer Controller)
PDF  96 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83251 Datasheet(HTML) 40 Page - National Semiconductor (TI)

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50 Registers (Continued)
CURRENT NOISE COUNT REGISTER (CNCR)
The Current Noise Count Register takes a snap-shot of the Noise Counter during every Control Bus Interface read-cycle of this
register
During a Control Bus Interface write-cycle to the Current Noise Count Register the PLAYER device will set the Control Bus
Write Command Reject bit (CCR) of the Interrupt Condition Register (ICR) to 1 and will ignore a write-cycle
ACCESS RULES
ADDRESS
READ
WRITE
0Fh
Always
Write Reject
D7
D6
D5
D4
D3
D2
D1
D0
NCLSCD
CNC6
CNC5
CNC4
CNC3
CNC2
CNC1
CNC0
Bit
Symbol
Description
D0–6
CNC0–6
CURRENT NOISE COUNT BIT k0–6l
D7
NCLSCD
NOISE COUNTER LINE STATE CHANGE DETECTION
40



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