SMSC LAN8720, LAN8720i NAME, MODE, NAME, MODE, NAME, MODE, Note:, ADDRESS, DEFAULT, ADDRESS, DEFAULT, ADDRESS, DEFAULT, DESCRIPTION, DESCRIPTION, DESCRIPTION

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support

Datasheet

Table 5.29 Register 17 - Mode Control/Status (continued)

ADDRESS	NAME	DESCRIPTION	MODE	DEFAULT
17.6	ALTINT	Alternate Interrupt Mode.	RW	0
		0 = Primary interrupt system enabled (Default).
		1 = Alternate interrupt system enabled.
		See Section 5.2, "Interrupt Management," on page 48.
17.5:4	Reserved	Write as 0, ignore on read.	RW	00
17.3	PHYADBP	1 = PHY disregards PHY address in SMI access	RW	0
		write.
17.2	Force	0 = normal operation;	RW	0
	Good Link Status	1 = force 100TX- link active;
		Note: This bit should be set only during lab testing
17.1	ENERGYON	ENERGYON – indicates whether energy is detected	RO	X
		on the line (see Section 5.3.5.2, "Energy Detect
		Power-Down," on page 51); it goes to “0” if no valid
		energy is detected within 256ms. Reset to “1” by
		hardware reset, unaffected by SW reset.
17.0	Reserved	Write as 0. Ignore on read.	RW	0
		Table 5.30 Register 18 - Special Modes
ADDRESS	NAME	DESCRIPTION	MODE	DEFAULT
18.15	Reserved	Write as 0, ignore on read.	RW	0
18.14	Reserved	Write as 1, ignore on read.	RW,	1
			NASR
18.13:8	Reserved	Write as 0, ignore on read.	RW,	000000
			NASR
18.7:5	MODE	Transceiver Mode of operation. Refer to Section	RW,	XXX
		5.3.9.2, "Mode Bus – MODE[2:0]," on page 53 for	NASR
		more details.
18.4:0	PHYAD	PHY Address.	RW,	PHYAD
		The PHY Address is used for the SMI address and for	NASR
		the initialization of the Cipher (Scrambler) key. Refer
		to Section 5.3.9.1, "Physical Address Bus -
		PHYAD[0]," on page 53 for more details.
	Table 5.31 Register 26 - Symbol Error Counter
ADDRESS	NAME	DESCRIPTION	MODE	DEFAULT
26.15:0	Sym_Err_Cnt	100Base-TX receiver-based error register that	RO	0
		increments when an invalid code symbol is received
		including IDLE symbols. The counter is incremented
		only once per packet, even when the received packet
		contains more than one symbol error. The 16-bit
		register counts up to 65,536 (216) and rolls over to 0
		if incremented beyond that value. This register is
		cleared on reset, but is not cleared by reading the
		register. It does not increment in 10Base-T mode.

SMSC LAN8720/LAN8720i	45	Revision 1.0 (05-28-09)
	DATASHEET