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KSZ8721SL Datasheet(PDF) 7 Page - Micrel Semiconductor

Part # KSZ8721SL
Description  3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

KSZ8721SL Datasheet(HTML) 7 Page - Micrel Semiconductor

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May 2004
7
M9999-051704
KS8721BL/SL
Micrel
Pin Number
Pin Name
Type(1)
Pin Function
19
TXD2
Ipd
MII Transmit Data Input.
20
TXD3
Ipd
MII Transmit Data Input.
21
COL/RMII
Ipd/O
MII Collision Detect Output.
During reset, the pull-up/pull-down value is latched as RMII select. See “Strapping
Options” section for details.
22
CRS/
Ipd/O
MII Carrier Sense Output.
RMII_BTB
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.
23
GND
GND
Ground.
24
VDDIO
P
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.
25
INT#/
Ipu/O
Management Interface (MII) Interrupt Out. Interrupt level set by
PHYAD0
Register 1f, bit 9.
During reset, latched as PHYAD[0]. See “Strapping Options” section for details.
26
LED0/TEST
Ipu/O
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”
27
LED1/
Ipu/O
Speed LED Output. Latched as SPEED (Register 0, bit 13) during power-up/
SPD100/
reset. See “Strapping Options” section for details. Active low.
nFEF
Speed
Pin State
LED Definition
10BT
H
“Off”
100BT
L
“On”
28
LED2/
Ipu/O
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”
29
LED3/
Ipu/O
Collision LED Output. Latched as ANEG_EN (register 0h, bit 12) during power-up/
NWAYEN
reset. See “Strapping Options” section for details.
Collison
Pin State
LED Definition
No Collision
H
“Off”
Collision
L
“On”
30
PD#
Ipu
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.


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