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PDF KSZ9021GN Data sheet ( Hoja de datos )

Número de pieza KSZ9021GN
Descripción Gigabit Ethernet Transceiver
Fabricantes Micrel Semiconductor 
Logotipo Micrel Semiconductor Logotipo



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No Preview Available ! KSZ9021GN Hoja de datos, Descripción, Manual

KSZ9021GN
Gigabit Ethernet Transceiver
with GMII / MII Support
General Description
Features
The KSZ9021GN is a completely integrated triple speed
(10Base-T/100Base-TX/1000Base-T) Ethernet Physical
Layer Transceiver for transmission and reception of data
on standard CAT-5 unshielded twisted pair (UTP) cable.
The KSZ9021GN provides the industry standard GMII/MII
(Gigabit Media Independent Interface / Media Independent
Interface) for connection to GMII/MII MACs in Gigabit
Ethernet Processors and Switches for data transfer at
1000 Mbps or 10/100Mbps speed.
The KSZ9021GN reduces board cost and simplifies board
layout by using on-chip termination resistors for the four
differential pairs and by integrating a LDO controller to
drive a low cost MOSFET to supply the 1.2V core.
The KSZ9021GN provides diagnostic features to facilitate
system bring-up and debugging in production testing and
in product deployment. Parametric NAND tree support
enables fault detection between KSZ9021 I/Os and board.
Micrel LinkMD® TDR-based cable diagnostics permit
identification of faulty copper cabling. Remote and local
loopback functions provide verification of analog and
digital data paths.
The KSZ9021GN is available in a 64-pin, lead-free QFN
package (See Ordering Information).
Single-chip 10/100/1000Mbps IEEE 802.3 compliant
Ethernet Transceiver
GMII/MII standard compliant interface
Auto-negotiation to automatically select the highest link
up speed (10/100/100Mbps) and duplex (half/full)
On-chip termination resistors for the differential pairs
On-chip LDO controller to support single 3.3V supply
operation – requires only external FET to generate 1.2V
for the core
Jumbo frame support up to 16KB
125MHz Reference Clock Output
Programmable LED outputs for link, activity and speed
Baseline Wander Correction
LinkMD® TDR-based cable diagnostics for identification
of faulty copper cabling
Parametric NAND Tree support for fault detection
between chip I/Os and board.
Loopback modes for diagnostics
Automatic MDI/MDI-X crossover for detection and
correction of pair swap at all speeds of operation
____________________________________________________________________________________________________________
Functional Diagram
LinkMD is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
September 2010
M9999-091010-1.1

1 page




KSZ9021GN pdf
Micrel, Inc.
KSZ9021GN
Absolute Maximum Ratings ............................................................................................................................................ 41
Operating Ratings ............................................................................................................................................................ 41
Electrical Characteristics ................................................................................................................................................ 41
Timing Diagrams .............................................................................................................................................................. 44
GMII Transmit Timing .................................................................................................................................................... 44
GMII Receive Timing ..................................................................................................................................................... 45
MII Transmit Timing ....................................................................................................................................................... 46
MII Receive Timing ........................................................................................................................................................ 47
Auto-Negotiation Timing ................................................................................................................................................ 48
MDC/MDIO Timing ........................................................................................................................................................ 49
Reset Timing.................................................................................................................................................................. 50
Reset Circuit ..................................................................................................................................................................... 50
Reference Circuits – LED Strap-in Pins......................................................................................................................... 51
Reference Clock – Connection and Selection............................................................................................................... 52
Magnetics Specification .................................................................................................................................................. 52
Package Information ........................................................................................................................................................ 53
September 2010
5 M9999-091010-1.1

5 Page





KSZ9021GN arduino
Micrel, Inc.
Pin Number
Pin Name
20 DVDDL
21 TXD0
22 TXD1
23 TXD2
24 TXD3
25 DVDDL
26 TXD4
27 TXD5
28 TXD6
29 TXD7
30 DVDDH
31 TX_ER
32 GTX_CLK
Type(1) Pin Function
Single LED Mode
Activity
No Activity
Activity (RX, TX)
Pin State
H
Toggle
LED Definition
OFF
Blinking
KSZ9021GN
Tri-color Dual LED Mode
Link / Activity
Link off
1000 Link / No Activity
1000 Link / Activity (RX, TX)
100 Link / No Activity
100 Link / Activity (RX, TX)
10 Link / No Activity
10 Link / Activity (RX, TX)
Pin State
LED2 LED1
HH
LH
Toggle H
HL
H Toggle
LL
Toggle Toggle
LED Definition
LED2 LED1
OFF
OFF
ON OFF
Blinking OFF
OFF
ON
OFF
Blinking
ON ON
Blinking Blinking
For Tri-color Dual LED Mode, LED1 works in conjunction with LED2 (pin 17 to
indicate 10 Mbps Link and Activity.
P 1.2V digital VDD
I
GMII Mode:
GMII TXD0 (Transmit Data 0) Input
MII Mode:
MII TXD0 (Transmit Data 0) Input
I
GMII Mode:
GMII TXD1 (Transmit Data 1) Input
MII Mode:
MII TXD1 (Transmit Data 1) Input
I
GMII Mode:
GMII TXD2 (Transmit Data 2) Input
MII Mode:
MII TXD2 (Transmit Data 2) Input
I
GMII Mode:
GMII TXD3 (Transmit Data 3) Input
MII Mode:
MII TXD3 (Transmit Data 3) Input
P 1.2V digital VDD
I
GMII Mode:
GMII TXD4 (Transmit Data 4) Input
MII Mode:
This pin is not used and can be driven high or low.
I
GMII Mode:
GMII TXD5 (Transmit Data 5) Input
MII Mode:
This pin is not used and can be driven high or low.
I
GMII Mode:
GMII TXD6 (Transmit Data 6) Input
MII Mode:
This pin is not used and can be driven high or low.
I
GMII Mode:
GMII TXD7 (Transmit Data 7) Input
MII Mode:
This pin is not used and can be driven high or low.
P 3.3V or 2.5V digital VDD
I
GMII Mode:
GMII TX_ER (Transmit Error) Input
MII Mode:
MII TX_ER (Transmit Error) Input
If GMII / MII MAC does not provide the TX_ER output signal, this pin should be
tied low.
I
GMII Mode:
GMII GTX_CLK (Transmit Reference Clock) Input
September 2010
11 M9999-091010-1.1

11 Page







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