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DP83266 Datasheet(PDF) 60 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # DP83266
Description  MACSITM Device (FDDI Media Access Controller and System Interface)
PDF  152 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83266 Datasheet(HTML) 60 Page - National Semiconductor (TI)

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70 Control Information (Continued)
Current Transmitter Status Register (CTS0)
The Current Transmitter Status Register (CTS0) records the status of the Transmitter state machine It is continuously updated
It remains stable when accessed
When in Diagnose Mode this register is frozen on an internal error until the internal error event is cleared by resetting the
TSMERR bit in the Internal Event Latch Register
Access Rules
Address
Read
Write
00Eh
Always
Data Ignored
Register Bits
D7
D6
D5
D4
D3
D2
D1
D0
ROP
TS2
TS1
TS0
TTS3
TTS2
TTS1
TTS0
Bit
Symbol
Description
D7
ROP
Ring Operational Flag
Indicates the current value of the local Ring Operational Flag
D6–D4
TS(2–0)
Transmit State
TS(2 – 0) represent the current state of the Transmit state machine that implements the
ANSI X3T95 standard MAC Transmit Functions The encoding is shown below
TS2
TS1
TS0
Transmit State
0
0
0
Idle
0
0
1
Repeat
0
1
0
Data
0
1
1
Issue Token
1
0
0
Claim
1
0
1
Beacon
1
1
0
Reserved
1
1
1
Void
D3 – D0
TTS(3 – 0)
Transmit Timing State
TTS(3 – 0) represent the current state of the Transmit Timing state machine
The encoding is shown below
TTS3
TTS2
TTS1
TTS0
Transmit Timing State
0
0
0
0
Idle
0
0
0
1
Transmit Preamble
0
0
1
0
Wait for Data (FIFO)
0
0
1
1
Transmit SD and FC Fields
0
1
0
0
Transmit DA
0
1
0
1
Transmit SA
0
1
1
0
Transmit INFO
0
1
1
1
Transmit FCS
1
0
0
0
Transmit ED and FS
9h – Fh
Reserved
60



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