DP83257VF National Semiconductor, DP83257VF Datasheet - Page 80

• 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 –D7
5 0 Registers
5 36 SCRUB TIMER THRESHOLD REGISTER (STTR)
This is the threshold value of the internal scrub timer It has a resolution of 40 96 s and a maximum value of E 10 ms When
the scrub timer reaches zero the Scrub Timer Expired (CMTCR STE) bit is set
Scrubbing is initiated when MODE2 ESTC
Writing to STTR during scrubbing will not affect the scrubbing action
ACCESS RULES
Bit
STT7
D7
ADDRESS
STT0 –STT7
24h
Symbol
STT6
D6
(Continued)
SCRUB TIMER THRESHOLD BIT
STT0 is the Least Significant Bit (LSB)
Always
READ
STT5
D5
e
1 and a trigger condition occurs
STT4
D4
WRITE
Always
STT3
k
D3
0-7
80
l
Scrub Timer threshold
Description
STT2
D2
STT1
D1
STT0
D0