LAN8187-JT SMSC, LAN8187-JT Datasheet - Page 50

• Manufacturer Part Number: LAN8187-JT
• Description: Ethernet ICs HiPerfrm Ethrnt PHY
• Manufacturer: SMSC
• Type: MII/RMII Ethernet Transceiverr

Specifications of LAN8187-JT

• Ethernet Connection Type: 10 Base-T, 100 Base-TX
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Product: Ethernet Transceivers
• Number Of Transceivers: 1
• Standard Supported: 802.3ab
• Data Rate: 10 MB, 100 MB
• Supply Voltage (max): 3.3 V
• Supply Voltage (min): 1.8 V
• Supply Current (max): 39 mA, 81.6 mA
• Maximum Operating Temperature: + 70 C
• Package / Case: TQFP-64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

a.
Revision 1.7 (03-04-11)
5.3.2
30.5
30.4
30.3
30.2
30.1
Mask
30.7
30.6
If the mask bit is enabled and nINT has been de-asserted while ENERGYON is still high, nINT will assert for
256 ms, approximately one second after ENERGYON goes low when the Cable is unplugged. To prevent an
unexpected assertion of nINT, the ENERGYON interrupt mask should always be cleared as part of the
ENERGYON interrupt service routine.
29.5
29.4
29.3
29.2
29.1
29.7
29.6
Note: The ENERGYON bit 17.1 is defaulted to a ‘1’ at the start of the signal acquisition process,
Alternate Interrupt System
The Alternative method is enabled by writing a ‘1’ to 17.6 (ALTINT).
To set an interrupt, set the corresponding bit of the in the Mask Register 30, (see
To Clear an interrupt, either clear the corresponding bit in the Mask Register (30), this will de-assert
the nINT output, or Clear the Interrupt Source, and write a ‘1’ to the corresponding Interrupt Source
Flag. Writing a ‘1’ to the Interrupt Source Flag will cause the state machine to check the Interrupt
Source to determine if the Interrupt Source Flag should clear or stay as a ‘1’. If the Condition to De-
Assert is true, then the Interrupt Source Flag is cleared, and the nINT is also de-asserted. If the
Condition to De-Assert is false, then the Interrupt Source Flag remains set, and the nINT remains
asserted.
Interrupt Source Flag
Parallel Detection Fault
Remote Fault Detected
Auto-Negotiation Page
Auto-Negotiation LP
Auto-Negotiation
Acknowledge
therefore the Interrupt source flag 29.7 will also read as a ‘1’ at power-up. If no signal is
present, then both 17.1 and 29.7 will clear within a few milliseconds.
Link Down
ENERGYON
Received
complete
Table 5.47 Alternative Interrupt System Management Table.
Table 5.46 Interrupt Management Table.
5.14
1.4
1.2
6.4
6.1
17.1
1.5
±15kV ESD Protected MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX & flexPWR
Interrupt Source
DATASHEET
Parallel Detection
Page Received
Remote Fault
Acknowledge
Auto-Negotiate
Link Status
ENERGYON
Complete
Fault
50
Event to Assert
Rising 17.1
Rising 1.5
Rising 5.14
Falling 1.2
Rising 1.4
Rising 6.4
Rising 6.1
nINT
Condition to
De-Assert.
17.1 low
1.5 low
SMSC LAN8187/LAN8187i
Reading register 29 or
Reading register 6, or
Reading register 6, or
Reading register 1 or
Reading register 1 or
Re-AutoNegotiate, or
Re-AutoNegotiate or
Reading register 29
Reading register 29
Reading register 29
Read register 29
Falling of 6.1 or
Table
Falling 5.14 or
Falling 1.4, or
Falling 6.4 or
Link Down.
Link down
5.47).
Bit to Clear
Datasheet
®
nINT
29.7
29.6
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