IP1001 LF
Data Sheet
3.8
Smart speed
IP1001 supports smart speed function. If IP1001 can’t link at Gigabit speed due to cable quality, the link
speed is down shift to 100M automatically if smart speed option is turned on. If the function is turned off,
IP1001 will link down if it can’t link at giga mode due to cable quality. The function is default on and it can be
enabled/disabled by programming MII register 16.11.
3.9
Power supply
IP1001 has 4 sets of power pins, DVDD, AVDD, VDDO and AVDDH. VDDO is connected to 3.3v or 2.5v
depending on MAC interface is GMII or RGMII. AVDDH can use the same power source of VDDO, that is 3.3v
or 2.5v, but it needs a bead to prevent VDDO noise. AVDD can be connected to 1.8v or 2.1v. If there is no
external 1.8v power source, user can use the 2.1v power generated by the built in regulator (CTRL21). DVDD
is connected to 1.2v. The center tap of transformer can be connected to 2.1v or 2.5v. If there is no external
2.5v power source, user can use the 2.1v power generated by the built in regulator control(CTRL21). The
current limit of bead should be large enough to prevent the IR drop in power supply input.
2.5v or 2.1v (from regulator)
bead
C T
1.2v (from regulator)
D V D D
1.8v or
2.1v (from regulator)
AV D D
Transform er
IP 1001
bead
bead
VD D O
3.3v (G M II) or
2.5v (R G M II)
AV D D H
C TR L12D C TR L21
PN P
PN P
1.2v
2.1v
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Dec. 18, 2007
IP1001-DS-R06
Copyright © 2006, IC Plus Corp.
ETC [ ETC ]
