dp83261 National Semiconductor Corporation, dp83261 Datasheet - Page 35

• Manufacturer Part Number: dp83261
• Description: Bmac Device Fddi Media Access Controller
• Manufacturer: National Semiconductor Corporation

6 0 Control Information
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 of the Internal Event Latch Register
ACCESS RULES
REGISTER BITS
D0 – 3
D4 – 6
D7
ROP
D7
Bit
Address
0Eh
TS2
D6
TTS(0 – 3)
TS(0 – 2)
ROP
Symbol
TS1
D5
Always
Read
TS0
D4
TRANSMIT TIMING STATE TTS(0 – 3) represent the current state of the Transmitter
Timing state machine The encoding is shown below
Transmit State TS(0 – 2) represent the current state of the Transmit state machine that
implements the ANSI standard MAC Transmit Functions The encoding is shown below
Ring Operational Flag Indicates the current value of the local Ring Operational Flag
TTS3
TS2
(Continued)
0
0
0
0
0
0
0
0
1
0
0
0
0
1
1
1
1
Data Ignored
TTS3
D3
Write
9h – Fh
TTS2
D2
TTS2
TS1
0
0
0
0
1
1
1
1
0
0
0
1
1
0
0
1
1
TTS1
35
D1
TTS1
TS0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
TTS0
D0
Description
TTS0
Transmit State
Idle
Repeat
Data
Issue Token
Claim
Beacon
Reserved
Void
0
1
0
1
0
1
0
1
0
Transmit Timing State
Idle
Transmit Preamble
Wait for Data (FIFO)
Transmit SD
Transmit DA
Transmit SA
Transmit INFO
Transmit FCS
Transmit ED
Reserved
FC Fields
FS