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DP83256 データシート(PDF) 121 Page - Texas Instruments

部品番号 DP83256
部品情報  PLAYER(TM) Device (FDDI Physical Layer Controller)
PDF  146 Pages
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メーカー  TI1 [Texas Instruments]
ホームページ  http://www.ti.com
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DP83256 データシート(HTML) 121 Page - Texas Instruments

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70 Electrical Characteristics (Continued)
AC Characteristics for the PMD Interface
The following signals are covered PMD Indicate Data (PMID) Signal Detect (SD) and PMD Request Data (PMRD)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
T36
PMIDg to PMRDg Latency
Looped Back through
5
LBC
Configuration Switch
Cycles
LBC1 e 125 MHz
In Lock
(Note 1)
T37
SD Minimum Pulse Width
120
ns
T38
PMRD Rise Time
(Note 2)
15
ns
T39
PMRD Fall Time
(Note 2)
15
ns
Note 1
This only applies when the Alternate PMD Interface is disabled APMDREGAPMDEN e 0
Note 2
This parameter is not tested but is assured by correlation with characterization data
TLF11708 – 36
FIGURE 7-10 Primary PMD Timing Diagrams
120



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