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DP83255AVF Datasheet(PDF) 27 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP83255AVF
Description  PLAYER Device (FDDI Physical Layer Controller)
PDF  96 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83255AVF Datasheet(HTML) 27 Page - National Semiconductor (TI)

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50 Registers (Continued)
CURRENT TRANSMIT STATE REGISTER (CTSR)
The Current Transmit State Register can program the Transmitter Block to internally generate and transmit Idle Master Halt
Quiet or user programmable symbol pairs in addition to the normal transmission of incoming PHY Request data The Smoother
and PHY Request Data Parity may also be enabled and disabled through this register
The Transmit Modes overwrite the Repeat Filter and Smoother outputs while the Injection Symbols overwrite the Transmit
Modes
During the reset process (ie RST e GND) the Transmit Mode is set to Off (TMk20l e 010) the Smoother is enabled (ie SE
is set to 1) and the Reserved bit (b7) is set to 1 All other bits of this register are cleared (ie set to 0) during the reset process
ACCESS RULES
ADDRESS
READ
WRITE
04h
Always
Conditional
D7
D6
D5
D4
D3
D2
D1
D0
RES
PRDPE
SE
IC1
IC0
TM2
TM1
TM0
Bit
Symbol
Description
D0 D1
TM0 TM1
Transmit Mode k0 1 2l
These bits select one of the 6 transmission modes for the PMD Request
Data output port (TXDg)
D2
TM2
TM2
TM1
TM0
000
Active Transmit Mode (ATM)
Normal
transmission of incoming PHY Request data
001
Idle Transmit Mode (ITM)
Transmission of
Idle symbol pairs (11111 11111)
010
Off Transmit Mode (OTM)
Transmission of
Quiet symbol pairs (00000 00000) and
deassertion of the FOTX Enable pin (TXE)
011
Reserved
Reserved for future use Users
are discouraged from using this transmit
mode If selected however the transmitter
will generate Quiet symbol pairs (00000
00000)
100
Master Transmit Mode (MTM)
Transmission of Halt and Quiet symbol pairs
(00100 00000)
101
Halt Transmit Mode (HTM)
Transmission of
Halt symbol pairs (00100 00100)
110
Quiet Transmit Mode (QTM)
Transmission
of Quiet symbol pairs (00000 00000)
111
Reserved
Reserved for future use Users
are discouraged from using this transmit
mode If selected however the transmitter
will generate Quiet symbol pairs (00000
00000)
27



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