dp83251 National Semiconductor Corporation, dp83251 Datasheet - Page 40

• Manufacturer Part Number: dp83251
• Description: Player Device Fddi Physical Layer Controller
• Manufacturer: National Semiconductor Corporation

5 0 Registers
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
D0 – 6
D7
D7
NCLSCD
ADDRESS
Bit
0Fh
D6
CNC6
CNC0 – 6
NCLSCD
(Continued)
Symbol
READ
Always
D5
CNC5
WRITE
Write Reject
D4
CNC4
CURRENT NOISE COUNT BIT
NOISE COUNTER LINE STATE CHANGE DETECTION
D3
CNC3
40
D2
CNC2
k
Description
0 – 6
D1
CNC1
l
D0
CNC0