lan8720 Standard Microsystems Corp., lan8720 Datasheet - Page 45

• Manufacturer Part Number: lan8720
• Description: Small Footprint Rmii 10/100 Ethernet Transceiver With Hp Auto-mdix Support
• Manufacturer: Standard Microsystems Corp.

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720/LAN8720i
ADDRESS
ADDRESS
ADDRESS
18.13:8
26.15:0
18.7:5
18.4:0
17.5:4
18.15
18.14
17.6
17.3
17.2
17.1
17.0
Good Link Status
Sym_Err_Cnt
ENERGYON
PHYADBP
Reserved
Reserved
Reserved
Reserved
Reserved
PHYAD
ALTINT
NAME
MODE
NAME
NAME
Force
Table 5.29 Register 17 - Mode Control/Status (continued)
Table 5.31 Register 26 - Symbol Error Counter
Write as 0, ignore on read.
Write as 1, ignore on read.
Write as 0, ignore on read.
Transceiver Mode of operation. Refer to
5.3.9.2, "Mode Bus – MODE[2:0]," on page 53
more details.
PHY Address.
The PHY Address is used for the SMI address and for
the initialization of the Cipher (Scrambler) key. Refer
to
PHYAD[0]," on page 53
Alternate Interrupt Mode.
0 = Primary interrupt system enabled (Default).
1 = Alternate interrupt system enabled.
See
Write as 0, ignore on read.
1 = PHY disregards PHY address in SMI access
0 = normal operation;
1 = force 100TX- link active;
Note:
ENERGYON – indicates whether energy is detected
on the line (see
Power-Down," on page
energy is detected within 256ms. Reset to “1” by
hardware reset, unaffected by SW reset.
Write as 0. Ignore on read.
100Base-TX receiver-based error register that
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 (2
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.
Table 5.30 Register 18 - Special Modes
Section 5.3.9.1, "Physical Address Bus -
write.
Section 5.2, "Interrupt Management," on page
This bit should be set only during lab testing
DATASHEET
Section 5.3.5.2, "Energy Detect
DESCRIPTION
DESCRIPTION
DESCRIPTION
45
51); it goes to “0” if no valid
for more details.
16
) and rolls over to 0
Section
for
48.
MODE
MODE
MODE
NASR
NASR
NASR
NASR
RW,
RW,
RW,
RW,
Revision 1.0 (04-15-09)
RW
RW
RW
RW
RW
RO
RW
RO
DEFAULT
DEFAULT
DEFAULT
000000
PHYAD
XXX
00
0
0
X
0
0
0
0
1