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LAN8820I Datasheet(PDF) 27 Page - Microchip Technology

Part # LAN8820I
Description  RGMII 10/100/1000 Ethernet Transceiver
PDF  83 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

LAN8820I Datasheet(HTML) 27 Page - Microchip Technology

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 2009-2015 Microchip Technology Inc.
DS00001871B-page 27
LAN8820/LAN8820I
3.8.2
SOFTWARE CONFIGURATION
The Serial Management Interface (SMI) allows for the configuration and control of multiple transceivers. Several 16-bit
status and control registers are accessible through the management interface pins MDC and MDIO for 10/100/
1000Mbps operation. The device implements all the required MII registers and optional registers as described in Section
4.0, "Register Descriptions". Configuring the SMI address is described in Section 3.8.1.2.1. Refer to Section 3.4, "Serial
Management Interface (SMI)," on page 20 for additional information on the SMI.
3.9
Miscellaneous Functions
3.9.1
LEDS
The device provides the following LED signals to enable visual indication of status:
• 1000_LED
• 100_LED
• 10_LED
The Speed LEDs (1000_LED, 100_LED, 10_LED) are driven after a link is established. The functional operation of each
LED is detailed in TABLE 3-10:.
TABLE 3-9:
REGISTER BITS IMPACTED BY THE MODE OF OPERATION (MOD)
Reg 19
[15:11]
Mode Definitions
Reg 0
[13,12,8,6]
Reg 4
[8,7,6,5]
Reg 9
[12,11,10,9,8]
00000 -
10110
RESERVED
---
10111
All capable. Auto-negotiation enabled.
Auto master/slave resolution single port.
01X1
1111
00011
11000
All capable. Auto-negotiation enabled.
Auto master/slave resolution multi-port.
01X1
1111
01111
11001
All capable. Auto-negotiation enabled.
Manual master/slave resolution slave port.
01X1
1111
10011
11010
All capable. Auto-negotiation enabled.
Manual master/slave resolution master port.
01X1
1111
11111
11011 -
11111
RESERVED
---
TABLE 3-10:
LED OPERATION
LED
STATUS
DESCRIPTION
1000_LED
On
1000BASE-T link
Blinking
Transmit/receive activity
100_LED
On
100BASE-T link
Blinking
Transmit/receive activity
10_LED
On
10BASE-T link
Blinking
Transmit/receive activity



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