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DP83256VF Datasheet(PDF) 16 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP83256VF
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)

DP83256VF Datasheet(HTML) 16 Page - National Semiconductor (TI)

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30 Functional Description (Continued)
LINE STATE GENERATOR
The Line State Generator allows the transmission of the
PHY Request data and can also generate and transmit Idle
Master Halt or Quiet symbol pairs which can be used to
implement the Connection Management procedures as
specified in the FDDI Station Management (SMT) standard
document
The Line State Generator is programmed through Transmit
bits 0 to 2 (TMk20l) of the Current Transmit State Regis-
ter (CTSR)
Based on the setting of these bits the Transmitter Block
operates in a Transmit Mode where the Line State Genera-
tor overwrites the Repeat Filter and Smoother outputs
See INJECTION CONTROL LOGIC section for a listing of
the injection Transmit Modes
Table 3-4 describes the Transmit Modes
TABLE 3-4 Transmit Modes
Transit Mode
Behavior
Active Transmit Mode
Transmit data that comes
from Configuration Switch
Off Transmit Mode
Transmit Quiet symbol
pairs and disable the PMD
Transmitter
Idle Transmit Mode
Transmit Idle symbol pairs
Master Transmit Mode
Transmit Halt-Quiet
symbol pairs
Quiet Transmit Mode
Transmit Quiet symbol
pairs
Reserved Transmit Mode
Reserved for future use If
Mode selected Quiet
symbol pairs will be
transmitted
Halt Transmit Mode
Transmit Halt Symbol
pairs
Notes
TLF11708 – 7
SE Smoother Enable
C Preamble Counter
F
IDLE Force
Idle (Stop or ATM)
Xn Current Byte
Xn–1 Previous Byte
W RST
FIGURE 3-6 Smoother State Diagram
16



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