DP83256VF-AP NSC [National Semiconductor], DP83256VF-AP Datasheet - Page 82

• Manufacturer Part Number: DP83256VF-AP
• Manufacturer: NSC [National Semiconductor]

D0
D1
D2
D3
D4
D5
D6
D7
Bit
5 0 Registers
5 38 TRIGGER DEFINITION REGISTER (TDR)
This register determines which events cause a trigger transition and which transmit mode is entered when a trigger transition is
detected The trigger transmit modes are the same as those found in the Current Transmit State Register (CTSR) and are
loaded from the TDR into the CTSR when any of the selected trigger conditions occur When a trigger condition occurs
CMTCR TCO is set
The Trigger Definition Register is useful to implement the strict PC React time requirement
ACCESS RULES
TONT
Symbol
TTM0
TTM1
TTM2
TOSILS
TOMLS
TOHLS
TOQLS
TONT
D7
ADDRESS
26h
TRIGGER TRANSMIT MODE
Current Transmit State Register (CTSR) when a trigger condition is detected The trigger condition is selected by
the upper 5 bits of this register
TTM2
0
0
0
0
1
1
1
1
TRIGGER ON SILS Trigger when SILS is received
TRIGGER ON MLS Trigger when MLS is received
TRIGGER ON HLS Trigger when HLS is received
TRIGGER ON QLS (or NSD) Trigger when QLS is received
TRIGGER ON Noise Threshold Trigger when Noise Threshold is reached (Current Noise Register
TOQLS
D6
(Continued)
TTM1
0
0
1
1
0
0
1
1
Always
READ
TOHLS
D5
TTM0
0
1
0
1
0
1
0
1
Active Transmit Mode (ATM) Normal transmission of incoming PHY Request data
Idle Transmit Mode (ITM) Transmission of Idle symbol pairs (11111 11111)
Off Transmit Mode (OTM) Transmission of Quiet symbol pairs (00000 00000) and
deassertion of the PMD transmitter Enable pin (TXE)
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)
Master Transmit Mode (MTM) Transmission of Halt and Quiet symbol pairs
(00100 00000)
Halt Transmit Mode (HTM) Transmission of Halt symbol pairs (00100 00100)
Quiet Transmit Mode (QTM) Transmission of Quiet symbol pairs (00000 00000)
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)
TOMLS
D4
k
WRITE
Always
0 1 2
l
TOSILS
These bits select one of 6 transmission modes to be loaded into the
D3
82
Description
TTM2
D2
TTM1
D1
TTM0
D0
e
0)