KS8721CL 查看數據表（PDF） - Micrel
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KS8721CL Datasheet PDF : 33 Pages
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KS8721CL
Micrel, Inc.
Pin Number
19
20
21
Pin Name
TXD2
TXD3
COL/RMII
Type(1)
Ipd
Ipd
Ipd/O
22
CRS/
Ipd/O
RMII_BTB
23
GND
GND
24
VDDIO
P
25
INT#/
Ipu/O
PHYAD0
26
LED0/TEST
Ipu/O
PHYAD0
27
LED1/
Ipu/O
SPD100/
nFEF
28
LED2/
Ipu/O
29
LED3/
Ipu/O
NWAYEN
30
PD#
Ipu
Pin Function
MII Transmit Data Input.
MII Transmit Data Input.
MII Collision Detect Output.
During reset, the pull-up/pull-down value is latched as RMII select. See “Strapping
Options” section for details.
MII Carrier Sense Output.
During reset, the pull-up/pull-down value is latched as RMII back-to-back mode
when RMII mode is selected. See “Strapping Options” section for details.
Ground.
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 LED Output. The external pull-down enable test mode and only used
for the factory test. Active low.
Link
Pin State LED Definition
No Link
H
“Off”
Link
L
“On”
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”
LED Output. Latched as ANEG_EN (register 0h, bit 12) during power-up/
reset. See “Strapping Options” section for details.
Activity
Pin State LED Definition
Activity
–
“Toggle”
Power Down. 1 = Normal operation, 0 = Power-down. Active low.
Notes:
1. P = Power supply.
GND = Ground.
I = Input.
I/O = Bidirectional.
Ipd = Input w/ internal pull-down.
Ipd/O = Input w/ internal pull-down during reset, output pin otherwise.
Ipu = Input w/ internal pull-up.
Ipu/O = Input w/ internal pull-up during reset, output pin otherwise.
O = Output.
April 2005
7
M9999-041405
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