LAN8810 Datasheet, PDF (26/83 Pages) Microchip Technology – GMII 10/100/1000 Ethernet Transceiver

LAN8810/LAN8810I
TABLE 3-10: REGISTER BITS IMPACTED BY THE MODE OF OPERATION (MOD)
Reg 19
[15:11]
Mode Definitions
00000 10BASE-T Half Duplex. Auto-negotiation disabled.
00001 10BASE-T Full Duplex. Auto-negotiation disabled.
00010 100BASE-TX Half Duplex. Auto-negotiation disabled.
CRS is active during Transmit & Receive.
00011 100BASE-TX Full Duplex. Auto-negotiation disabled.
CRS is active during Receive.
00100 10BASE-T/100BASE-TX capable. Auto-negotiation enabled.
00101 RESERVED
00110 RESERVED
00111 All capable. Auto-negotiation enabled.
Auto master/slave resolution single port.
01000
01001
RESERVED
All capable. Auto-negotiation enabled.
Manual master/slave resolution slave port.
01010 All capable. Auto-negotiation enabled.
Manual master/slave resolution master port.
01011 - RESERVED
11111
Reg 0
Reg 4
Reg 9
[13,12,8,6] [8,7,6,5] [12,11,10,9,8]
0000
XXXX
XXX00
0010
XXXX
XXX00
1000
XXXX
XXX00
1010
XXXX
XXX00
11X0
-
-
01X1
1111
-
-
1111
XXX00
-
-
00011
-
01X1
-
1111
-
10011
01X1
1111
11111
-
-
-
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
• ACT_LED
In all modes, the Full Duplex LED (ACT_LED) is driven immediately after auto-negotiation has resolved the duplex state
and before the link is established. The Speed LEDs (1000_LED, 100_LED, 10_LED) are driven after a link is estab-
lished. Three LED modes of operation are available:
• LED Mode 1 (Table 3-11)
• LED Mode 2 (Table 3-12)
• LED Mode 3 (Default Mode - Table 3-13)
DS00001870B-page 26
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