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)

 

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