KS8721BL 查看數據表（PDF） - Micrel
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KS8721BL Datasheet PDF : 35 Pages
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Micrel, Inc.
KS8721BL/SL
Pin Number
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
Pin Name
VDDIO
INT#/
PHYAD0
LED0/
TEST
LED1/
SPD100/
nFEF
LED2
LED3/
NWAYEN
PD#
VDDRX
RX-
RX+
FXSD/
FXEN
GND
GND
REXT
VDDRCV
GND
TX-
TX+
VDDTX
GND
Type(1)
P
Ipu/O
Ipu/O
Ipu/O
Ipu/O
Ipu/O
Ipu
P
I
I
Ipd/O
Gnd
Gnd
I
P
Gnd
O
O
P
Gnd
Pin Function
Digital IO 2.5/3.3V tolerant power supply. 3.3V power input of voltage regulator.
See “Circuit Design Ref. for Power Supply” section for details.
Management Interface (MII) Interrupt Out. Interrupt level set by Register 1f, bit 9.
During reset, latched as PHYAD[0]. See “Strapping Options” section for details.
Link/Activity LED Output. The external pull-down enable test mode and only used for
the factory test. Active low.
Link/Act
Pin State LED Definition PHYAD0
No Link
H
“Off”
Link
L
“On”
Act
–
“Toggle”
Speed LED Output. Latched as SPEED (Register 0, bit 13) during power-up/ reset. See
“Strapping Options” section for details. Active low.
Speed
Pin State LED Definition
10BT
H
“Off”
100BT
L
“On”
Full-duplex LED Output. Latched as DUPLEX (register 0h, bit 8) during power-up/ reset.
See “Strapping DUPLEX Options” section for details. Active low.
Duplex
Pin State LED Definition
Half
H
“Off”
Full
L
“On”
Collision LED Output. Latched as ANEG_EN (register 0h, bit 12) during power-up/
reset. See “Strapping Options” section for details.
Collision
Pin State LED Definition
No Collision H
“Off”
Collision
L
“On”
Power Down. 1 = Normal operation, 0 = Power-down. Active low.
Analog 2.5V power supply. See “Circuit Design Ref. for Power Supply” section for
details.
Receive Input. Differential receive input pins for 100FX, 100BASE-TX, or 10BASE-T.
Receive Input: Differential receive input pin for 100FX, 100BASE-TX, or 10BASE-T.
Fiber Mode Enable / Signal Detect in Fiber Mode. If FXEN = 0, FX mode is disable. The
default is “0”. See “100BT FX Mode” section for more details.
Ground.
Ground.
External resistor (6.49kW ) connects to REXT and GND.
Analog 2.5V power supply. 2.5V power output of voltage regulator. See “Circuit Design
Ref. for Power Supply” section for details.
Ground.
Transmit Outputs: Differential transmit output for 100FX, 100BASE-TX, or 10BASE-T.
Transmit Outputs: Differential transmit output for 100FX, 100BASE-TX, or 10BASE-T.
Transmitter 2.5V power supply. See “Circuit Design Ref. for Power Supply” section for
details.
Ground.
June 2009
8
M9999-062509-1.3
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