DP83257VF National Semiconductor, DP83257VF Datasheet - Page 60

• Manufacturer Part Number: DP83257VF
• Description: IC FDDI LAYER CTRLR 160PQFP
• Manufacturer: National Semiconductor

Specifications of DP83257VF

• Controller Type: physical layer controller
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 160-BFQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Supply: -
• Interface: -
• Other names: *DP83257VF

D0 –D6
D7
5 0 Registers
5 16 CURRENT NOISE COUNT REGISTER (CNCR)
The Current Noise Count Register takes a snap-shot of the Noise Timer during every Control Bus Interface read cycle of this
register
During a Control Bus Interface write cycle the Control Bus Write Command Reject bit (CCR) of the Interrupt Condition Register
(ICR) will be set to 1 and will ignore a write cycle
ACCESS RULES
Bit
NCLSCD
ADDRESS
D7
0Fh
CNC0–CNC6
NCLSCD
Symbol
CNC6
D6
(Continued)
CURRENT NOISE COUNT BIT
NOISE COUNTER LINE STATE CHANGE DETECTION
Always
READ
CNC5
D5
Write Reject
WRITE
CNC4
D4
k
CNC3
0–6
D3
60
l
Snapshot of the Noise Counter
Description
CNC2
D2
CNC1
D1
CNC0
D0