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DP83256 Datasheet(PDF) 51 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP83256
Description  PLAYERa??Device (FDDI Physical Layer Controller)
PDF  144 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83256 Datasheet(HTML) 51 Page - National Semiconductor (TI)

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50 Registers (Continued)
57 INJECTION SYMBOL REGISTER A (ISRA)
The Injection Symbol Register A along with Injection Symbol Register B contains the programmable value (already in 5B code)
that can be inserted to replace the data symbol pairs
In One Shot mode ISRA and ISRB are injected n bytes after a JK where n is the programmed value of the Injection Threshold
Register In the Periodic mode ISRA and ISRB are injected every n-th symbol pair In the Continuous mode all data symbols are
replaced with ISRA and ISRB
ACCESS RULES
ADDRESS
READ
WRITE
06h
Always
Always
D7
D6
D5
D4
D3
D2
D1
D0
RES
RES
RES
IJS4
IJS3
IJS2
IJS1
IJS0
Bit
Symbol
Description
D0 – D4
IJS0 – IJS4
INJECTION SYMBOL BITk0-4l
Symbol to be injected
IJS0 is the Least Significant Bit (LSB) and goes out onto the media last
D5 – D7
RES
RESERVED
Reserved for future use
Note
Users are discouraged from using these bits The reserved bits are set to 0 during the reset process They may be set or cleared
without any effects to the functionality of the PLAYERa device
51



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