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DP83261AVF датащи(PDF) 74 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали DP83261AVF
подробное описание детали  BMAC Device (FDDI Media Access Controller)
PDF  132 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83261AVF датащи(HTML) 74 Page - National Semiconductor (TI)

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70 Signal Descriptions (Continued)
PH
DATARequest
The Ring Engine generates the 10 bit byte stream as defined in Table 7-2 Note that all symbol pairs are either control or data
symbol pairs Mixed datacontrol symbol pairs are never generated or repeated by the Ring Engine
TABLE 7-2 Internal PHY Request Coding
Value
PRP
PRC
PRD(7 – 4)
PRD(3 – 0)
Type
0
1
0
0000
0000
Data Symbol Pair
1
0
0
0000
0001
Data Symbol Pair
254
0
0
1111
1110
Data Symbol Pair
255
1
0
1111
1111
Data Symbol Pair
JK
0
1
1101
1101
Start Delimiter
II
0
1
1010
1010
Idle Symbols
RR
0
1
0110
0110
Frame Status
RS
1
1
0110
0111
Frame Status
RT
0
1
0110
0101
Frame Status
SS
0
1
0111
0111
Frame Status
SR
1
1
0111
0110
Frame Status
ST
1
1
0111
0101
Frame Status
TR
0
1
0101
0110
Ending Delimiter
TS
1
1
0101
0111
Ending Delimiter
TT
0
1
0101
0101
Ending Delimiter
Where
PRP
PHY Request Parity bit parity for all symbol pairs is ODD
PRC
PHY Request control bit
0eldata byte
1elcontrol byte
PRD(7 – 0) PHY Request Data (7 – 0)
The Ring Engine can repeat the RS RT and ST symbol pairs but does not create them
74



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