KS8721BI(2003) データシートの表示（PDF） - Micrel
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コンポーネント説明
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KS8721BI Datasheet PDF : 32 Pages
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KS8721B/BT
Micrel
Pin Number
25
22
23
26
27
28
29
30
31
32
33
34
35
36
Pin Name
INT#/
PHYAD0
CRS/
RMII_BTB
GND
LED0/TEST
LED1/
SPD100/
noFEF
LED2/
DUPLEX
LED3/
NWAYEN
PD#
VDDRX
RX-
RX+
FXSD/FXEN
GND
GND
Type(Note 1)
Ipu/O
Ipd/O
GND
Ipu/O
Ipu/O
Ipu/O
Ipu/O
Ipu
Pwr
I
I
Ipd/O
GND
GND
Pin Function
Management Interface (MII) Interrupt Out: Latched as PHYAD[0] during power up
/reset. See “Strapping Options” section for details.
MII Carrier Sense Output: The pull-up/pull-down value is latched as RMII BTB
during reset when RMII mode is selected. See “Strapping Options” section
for details.
Ground.
Link/Activity LED Output:
Lnk/Act
Pin State LED Definition
No Link
H
“off”
Link
L
“on”
Act
—
“Toggle”
The external pull-down enable test mode and only used for the factory test.
Speed LED Output: Latched as SPEED (Register 0, bit 13) during power-up/reset.
See “Strapping Options” section for details.
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 Options” section for details.
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.
Collison
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.
Receive Input: Differential receive input pins for FX, 100BaseTX or 10BaseT.
Receive Input: Differential receive input pin for FX, 100BaseTX or 10BaseT.
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.
Note 1.
Pwr = power supply
GND = ground
I = input
O = output
I/O = bi-directional
Ipu = input w/ internal pull-up
Ipd = input w/ internal pull-down
Ipd/O = input w/ internal pull-down during reset, output pin otherwise
Ipu/O = input w/ internal pull-up during reset, output pin otherwise
PU = strap pin pull-up
PD = strap pin pull-down
NC = No connect
August 2003
7
KS8721B/BT
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