K
KSZ8081
1RNA/KS
SZ8081R
RND
10Bas
se-T/100Ba
ase-TX PHY
Y
w
with RMII Su
upport
Revision 1.2
Gen
neral Desc
cription
The KSZ8081RNA is a single-supply 10Ba
A
ase-T/100Bas
se-
Ethernet phy
ysical-layer tr
ransceiver fo transmission
or
TX E
and reception of data over standard CAT unshielded
s
T-5
ed
)
twiste pair (UTP) cable.
The KSZ8081RNA is a highly
y-integrated PHY solution. It
P
ces
st
out
o
reduc board cos and simplifies board layo by using on-
chip termination resistors for the differentia pairs and by
r
t
al
r
e
integrating a low-noise regulator to supply the 1.2V core, and
ffering 1.8/2.5
5/3.3V digital I/O interface support.
s
by of
The K
KSZ8081RNA offers the Reduced Med Independe
A
R
dia
ent
Interf
face (RMII) for direct co
f
onnection to RMII-complia
ant
MAC in Ethernet processors and switches.
Cs
t
a
As th power-up default, the KSZ8081RNA uses a 25MH
he
d
K
A
Hz
cryst
tal to generate all requ
uired clocks, including the
Hz
erence clock output for the MAC. The
50MH RMII refe
KSZ8
8081RND is the version th takes in th 50MHz RM
t
hat
he
MII
refere
ence clock as the power-u default.
s
up
To fa
acilitate syste bring-up and debugging in production
em
a
testin and in pro
ng
oduct deploym
ment, parame
etric NAND tree
supp
port enables fault detection between KSZ8081RN
NA
®
I/Os and the boa
ard. Micrel’s LinkMD TD
DR-based cab
ble
nostics identif faulty copper cabling.
fy
diagn
The KSZ8081RNA and KSZ80
A
081RND are available in 24-
a
2
N
see
pin, lead-free QFN packages (s
Ordering Information).
Datasheets and support docu
s
umentation ar available on
re
el’s
a
el.com.
Micre web site at:
www.micre
Featu
ures
Sing
gle-chip 10Ba
ase-T/100Bas
se-TX IEEE 80
02.3
com
mpliant Ethern transceive
net
er
RMI v1.2 Interface support with a 50MHz r
II
reference
ck
MAC, and an o
option to input a 50MHz
cloc output to M
refe rence clock
RMI back-to-bac mode supp for a 100M
II
ck
port
Mbps copper
eater
repe
MDC
C/MDIO mana
agement inte
erface for PHY register
Y
conf
figuration
Prog
grammable in
nterrupt outpu
ut
LED outputs for link and activi status indic
D
ity
cation
On-c
chip termination resistors f the differe
for
ential pairs
Bas eline wander correction
HP A
Auto MDI/MD
DI-X to reliably detect and c
y
correct
straiight-through a crossove cable conne
and
er
ections with
disa
able and enab option
ble
Auto
o-negotiation to automatica select the highest link-
ally
e
-
up s
speed (10/100
0Mbps) and d
duplex (half/fu
ull)
Pow
wer-down and power-saving modes
d
Link
kMD TDR-bas cable diag
sed
gnostics to identify faulty
copp cabling
per
Para
ametric NAND Tree suppo for fault de
D
ort
etection
betw
ween chip I/O and the boa
Os
ard
Fun
nctional Diagram
MD
ed
M
LinkM is a registere trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Driv • San Jose, CA 95131 • USA • tel +1 (408) 94
ve
C
44-0800 • fax + 1 (408) 474-1000 •
http://www.m
0
micrel.com
December 10, 2014
4
Revision 1.2
Micrel, Inc.
KSZ8081RNA/KSZ8081RND
Features (Continued)
•
Loopback modes for diagnostics
•
Single 3.3V power supply with VDD I/O options for 1.8V,
2.5V, or 3.3V
•
Built-in 1.2V regulator for core
•
Available in 24-pin 4mm x 4mm QFN package
Applications
•
•
•
•
•
•
Game consoles
IP phones
IP set-top boxes
IP TVs
LOM
Printers
Ordering Information
For the device marking (second column in the following table), the fifth character of line three indicates whether the device
has gold wire bonding or silver wire bonding, as follows:
•
•
Gold wire bonding: The letter “S” is not present as the fifth character of line 3.
Silver wire bonding: The letter “S” is present as the fifth character of line 3.
For line three, the present or not present of the letter “S” is preceded by YYWW, indicating the last two digits of the year
and the two digits work week for the chip date code, and is followed by xxx, indicating the chip revision and assembly site.
Ordering Part Number
Device
Marking
KSZ8081
RNACA
YYWWxxx
KSZ8081
RNACA
YYWWSxxx
KSZ8081
RNAIA
YYWWxxx
KSZ8081
RNAIA
YYWWSxxx
KSZ8081
RNDCA
YYWWxxx
KSZ8081
RNDCA
YYWWSxxx
Temperature
Range
0°C to 70°C
Wire
Bonding
Gold
Description
RMII with 25MHz crystal/clock input and 50MHz RMII
REF_CLK output (power-up default), Commercial
Temperature, Gold Wire Bonding, 24-Pin QFN,
Pb-Free
RMII with 25MHz crystal/clock input and 50MHz RMII
REF_CLK output (power-up default), Commercial
Temperature, Silver Wire Bonding, 24-Pin QFN,
Pb-Free
RMII with 25MHz crystal/clock input and 50MHz RMII
REF_CLK output (power-up default), Industrial
Temperature, Gold Wire Bonding, 24-Pin QFN,
Pb-Free
RMII with 25MHz crystal/clock input and 50MHz RMII
REF_CLK output (power-up default), Industrial
Temperature, Silver Wire Bonding, 24-Pin QFN,
Pb-Free
RMII with 50MHz clock input (power-up default),
Commercial Temperature, Gold Wire Bonding,
24-Pin QFN, Pb-Free
RMII with 50MHz clock input (power-up default),
Commercial Temperature, Silver Wire Bonding,
24-Pin QFN, Pb-Free
RMII with 50MHz clock input (power-up default),
Industrial Temperature, Gold Wire Bonding,
24-Pin QFN, Pb-Free
KSZ8081RNACA
SPNZ801133
(1)
0°C to 70°C
Silver
KSZ8081RNAIA
(1)
−40°C
to 85°C
Gold
SPNY801133
(1)
−40°C
to 85°C
Silver
KSZ8081RNDCA
0°C to 70°C
Gold
SPNZ801132
(1)
0°C to 70°C
Silver
KSZ8081RNDIA
Note:
(1)
KSZ8081
RNDIA
YYWWxxx
−40°C
to 85°C
Gold
1. Contact factory for availability.
December 10, 2014
2
Revision 1.2
Micrel, Inc.
KSZ8081RNA/KSZ8081RND
Ordering Information (Continued)
Ordering Part Number
(1)
Device
Marking
KSZ8081
RNDIA
YYWWSxxx
Temperature
Range
−40°C
to 85°C
Wire
Bonding
Silver
Description
RMII with 50MHz clock input (power-up default),
Industrial Temperature, Silver Wire Bonding, 24-Pin
QFN, Pb-Free
KSZ8081RNA Evaluation Board
(Mounted with KSZ8081RNA device in commercial
temperature)
KSZ8081RND Evaluation Board
(Mounted with KSZ8081RND device in commercial
temperature)
SPNY801132
KSZ8081RNA-EVAL
KSZ8081RND-EVAL
Revision History
Date
11/5/12
2/6/14
Summary of Changes
Initial release of datasheet.
Removed copper wire bonding part numbers from Ordering Information.
Added note for RXER (Pin 17) and Register 16h, Bit [15] regarding a Reserved Factory Mode.
Added series resistance and load capacitance for the 25MHz crystal selection criteria.
Added industrial temperature part number KSZ8081RNDIA to Ordering Information.
Added silver wire bonding part numbers to Ordering Information.
Updated Ordering Information to include Ordering Part Number and Device Marking.
Revision
1.0
1.1
12/10/14
1.2
December 10, 2014
3
Revision 1.2
Micrel, Inc.
KSZ8081RNA/KSZ8081RND
Contents
List of Figures .......................................................................................................................................................................... 5
List of Tables ........................................................................................................................................................................... 6
Pin Configuration ..................................................................................................................................................................... 7
Pin Description ........................................................................................................................................................................ 8
Strapping Options ................................................................................................................................................................. 11
Functional Description: 10Base-T/100Base-TX Transceiver ................................................................................................ 12
100Base-TX Transmit........................................................................................................................................................ 12
100Base-TX Receive......................................................................................................................................................... 12
Scrambler/De-Scrambler (100Base-TX Only) ................................................................................................................... 12
10Base-T Transmit ............................................................................................................................................................ 13
10Base-T Receive ............................................................................................................................................................. 13
PLL Clock Synthesizer ...................................................................................................................................................... 13
Auto-Negotiation ................................................................................................................................................................ 13
RMII Interface ........................................................................................................................................................................ 15
RMII Signal Definition ........................................................................................................................................................ 15
RMII Signal Diagram – 25/50MHz Clock Mode ................................................................................................................. 16
Back-to-Back Mode
−
100Mbps Copper Repeater ............................................................................................................... 18
RMII Back-to-Back Mode................................................................................................................................................... 18
MII Management (MIIM) Interface ......................................................................................................................................... 19
Interrupt (INTRP) ................................................................................................................................................................... 19
HP Auto MDI/MDI-X .............................................................................................................................................................. 20
Straight Cable .................................................................................................................................................................... 20
Crossover Cable ................................................................................................................................................................ 21
Loopback Mode ..................................................................................................................................................................... 21
Local (Digital) Loopback .................................................................................................................................................... 21
Remote (Analog) Loopback ............................................................................................................................................... 22
LinkMD
®
Cable Diagnostic .................................................................................................................................................... 24
NAND Tree Support .............................................................................................................................................................. 24
NAND Tree I/O Testing ..................................................................................................................................................... 25
Power Management .............................................................................................................................................................. 26
Power-Saving Mode .......................................................................................................................................................... 26
Energy-Detect Power-Down Mode .................................................................................................................................... 26
Power-Down Mode ............................................................................................................................................................ 26
Slow-Oscillator Mode......................................................................................................................................................... 26
Reference Circuit for Power and Ground Connections ......................................................................................................... 27
Typical Current/Power Consumption .................................................................................................................................... 28
Register Map ......................................................................................................................................................................... 30
Register Description .............................................................................................................................................................. 31
Absolute Maximum Ratings .................................................................................................................................................. 41
Operating Ratings ................................................................................................................................................................. 41
Electrical Characteristics ....................................................................................................................................................... 41
Timing Diagrams ................................................................................................................................................................... 43
RMII Timing ....................................................................................................................................................................... 43
Auto-Negotiation Timing .................................................................................................................................................... 44
MDC/MDIO Timing ............................................................................................................................................................ 45
Power-Up/Reset Timing .................................................................................................................................................... 46
Reset Circuit .......................................................................................................................................................................... 47
Reference Circuits
−
LED Strap-In Pins ................................................................................................................................ 48
Reference Clock
−
Connection and Selection ...................................................................................................................... 49
Magnetic
−
Connection and Selection .................................................................................................................................. 50
Package Information and Recommended Landing Pattern .................................................................................................. 52
December 10, 2014
4
Revision 1.2
Micrel, Inc.
KSZ8081RNA/KSZ8081RND
List of Figures
Figure 1. Auto-Negotiation Flow Chart ................................................................................................................................ 14
Figure 2. KSZ8081RNA/RND RMII Interface (RMII – 25MHz Clock Mode) ....................................................................... 17
Figure 3. KSZ8081RNA/RND RMII Interface (RMII – 50MHz Clock Mode) ....................................................................... 17
Figure 4. KSZ8081RNA/RND and KSZ8081RNA/RND RMII Back-to-Back Copper Repeater .......................................... 18
Figure 5. Typical Straight Cable Connection ...................................................................................................................... 20
Figure 6. Typical Crossover Cable Connection .................................................................................................................. 21
Figure 7. Local (Digital) Loopback ...................................................................................................................................... 22
Figure 8. Remote (Analog) Loopback ................................................................................................................................. 23
Figure 9. KSZ8081RNA/RND Power and Ground Connections ......................................................................................... 27
Figure 10. RMII Timing
−
Data Received from RMII ............................................................................................................. 43
Figure 11. RMII Timing
−
Data Input to RMII ........................................................................................................................ 43
Figure 12. Auto-Negotiation Fast Link Pulse (FLP) Timing .................................................................................................. 44
Figure 13. MDC/MDIO Timing............................................................................................................................................... 45
Figure 14. Power-Up/Reset Timing ....................................................................................................................................... 46
Figure 15. Recommended Reset Circuit ............................................................................................................................... 47
Figure 16. Recommended Reset Circuit for Interfacing with CPU/FPGA Reset Output ...................................................... 47
Figure 17. Reference Circuits for LED Strapping Pins ......................................................................................................... 48
Figure 18. 25MHz Crystal/Oscillator Reference Clock Connection ...................................................................................... 49
Figure 19. 50MHz Oscillator Reference Clock Connection .................................................................................................. 49
Figure 20. Typical Magnetic Interface Circuit........................................................................................................................ 50
December 10, 2014
5
Revision 1.2
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