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LAN8710A-EZC 데이터시트(PDF) 35 Page - SMSC Corporation

부품명 LAN8710A-EZC
상세설명  Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR Technology
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제조업체  SMSC [SMSC Corporation]
홈페이지  http://www.smsc.com
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LAN8710A-EZC 데이터시트(HTML) 35 Page - SMSC Corporation

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Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology
Datasheet
SMSC LAN8710A/LAN8710Ai
35
Revision 1.4 (08-23-12)
DATASHEET
Note: The ENERGYON bit in the Mode Control/Status Register is defaulted to a ‘1’ at the start of the
signal acquisition process, therefore the INT7 bit in the Interrupt Mask Register will also read
as a ‘1’ at power-up. If no signal is present, then both ENERGYON and INT7 will clear within
a few milliseconds.
3.6.2
Alternate Interrupt System
The Alternate interrupt system is enabled by setting the ALTINT bit of the Mode Control/Status Register
to “1”. In this mode, to set an interrupt, set the corresponding bit of the in the Mask Register 30, (see
Table 3.4). To Clear an interrupt, either clear the corresponding bit in the Interrupt Mask Register to
deassert 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 deassert is true, then the Interrupt Source Flag is cleared and nINT is also deasserted. If the
Condition to deassert is false, then the Interrupt Source Flag remains set, and the nINT remains
asserted.
For example, setting the INT7 bit in the Interrupt Mask Register will enable the ENERGYON interrupt.
After a cable is plugged in, the ENERGYON bit in the Mode Control/Status Register goes active and
nINT will be asserted low. To de-assert the nINT interrupt output, either clear the ENERGYON bit in
the Mode Control/Status Register by removing the cable and then writing a ‘1’ to the INT7 bit in the
Interrupt Mask Register, OR clear the INT7 mask (bit 7 of the Interrupt Mask Register).
Note: The ENERGYON bit in the Mode Control/Status Register is defaulted to a ‘1’ at the start of the
signal acquisition process, therefore the INT7 bit in the Interrupt Mask Register will also read
as a ‘1’ at power-up. If no signal is present, then both ENERGYON and INT7 will clear within
a few milliseconds.
Table 3.4 Alternative Interrupt System Management Table
MASK
INTERRUPT SOURCE
FLAG
INTERRUPT SOURCE
EVENT TO
ASSERT nINT
CONDITION
TO
DE-ASSERT
BIT TO
CLEAR
nINT
30.7
29.7
ENERGYON
17.1
ENERGYON
Rising 17.1
17.1 low
29.7
30.6
29.6
Auto-Negotiation
complete
1.5
Auto-Negotiate
Complete
Rising 1.5
1.5 low
29.6
30.5
29.5
Remote Fault
Detected
1.4
Remote Fault
Rising 1.4
1.4 low
29.5
30.4
29.4
Link Down
1.2
Link Status
Falling 1.2
1.2 high
29.4
30.3
29.3
Auto-Negotiation
LP Acknowledge
5.14
Acknowledge
Rising 5.14
5.14 low
29.3
30.2
29.2
Parallel
Detection Fault
6.4
Parallel Detection
Fault
Rising 6.4
6.4 low
29.2
30.1
29.1
Auto-Negotiation
Page Received
6.1
Page Received
Rising 6.1
6.1 low
29.1


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