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Teilenummer | ET1011 |
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Beschreibung | A gigabit Ethemet transceiver | |
Hersteller | Agere Systems | |
Logo | ||
Gesamt 30 Seiten Preliminary Data Sheet
April 2004
TruePHY ™ ET1011
Gigabit Ethernet Transceiver
Features
■ 10Base-T, 100Base-TX, and 1000Base-T
gigabit Ethernet transceiver:
— 0.13 µm process
www.DataSheet4U.com — 128-pin TQFP:
❏ RGMII, GMII, MII, RTBI, and TBI interfaces to
MAC or switch
— 68-pin MLCC:
❏ RGMII and RTBI interfaces to MAC or switch
■ Low power consumption:
— Less than 750 mW in 1000Base-T mode
— Advanced power management
— ACPI compliant wake-on-LAN support
■ Oversampling architecture to improve signal integ-
rity and SNR
■ Optimized, extended performance echo and NEXT
filters
■ All digital baseline wander correction
■ Digital PGA control
■ On-chip diagnostic support
■ Automatic speed negotiation
■ Automatic speed downshift
■ Single supply 3.3 V or 2.5 V operation:
— On-chip regulator controllers
— 3.3 V or 2.5 V digital I/O
— 1.0 V core power supplies
— 1.8 V or 2.5 V for transformer center tap
■ JTAG
Introduction
Agere Systems ET1011 is a gigabit Ethernet trans-
ceiver fabricated on a single CMOS chip. Packaged
in either a 128-pin TQFP or a 68-pin MLCC, the
ET1011 is built on 0.13 µm technology for low power
consumption and application in server and desktop
NIC cards. It features single power supply operation
using on-chip regulator controllers. The 10/100/
1000Base-T device is fully compliant with IEEE®
802.3, 802.3u, and 802.3ab standards.
The ET1011 uses an oversampling architecture to
gather more signal energy from the communication
channel than possible with traditional architectures.
The additional signal energy or analog complexity
transfers into the digital domain. The result is an ana-
log front end that delivers robust operation, reduced
cost, and lower power consumption than traditional
architectures.
Using oversampling has allowed for the implementa-
tion of a fractionally spaced equalizer, which provides
better equalization and has greater immunity to tim-
ing jitter, resulting in better signal-to-noise ratio
(SNR) and thus improved BER. In addition,
advanced timing algorithms are used to enable oper-
ation over a wider range of cabling plants.
TruePHY ET1011
Gigabit Ethernet Transceiver
Preliminary Data Sheet
April 2004
Functional Description (continued)
Adaptive Fractionally Spaced Equalizer
The ET1011’s unique oversampling architecture
employs an FSE in place of the traditional FFE struc-
ture. This results in robust equalization of the commu-
nications channel, which translates to superior bit error
rate (BER) performance over the widest variety of
worst-case cabling scenarios. The all-digital equalizer
automatically adapts to changing conditions.
Echo and Crosstalk Cancellers
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Since the four twisted pairs are bundled together and
not insulated from each other in Gigabit Ethernet, each
of the transmitted signals is coupled onto the three
other cables and is seen at the receiver as near-end
crosstalk (NEXT). A hybrid circuit is used to transmit
and receive simultaneously on each pair. If the trans-
mitter is not perfectly matched to the line, a signal com-
ponent will be reflected back as an echo. Reflections
can also occur at other connectors or cable imperfec-
tions. The ET1011 cancels echo and NEXT by sub-
tracting an estimate of these signals from the equalizer
output.
Baseline Wander Correction
A known issue for 1000Base-T and 100Base-TX is that
the transformer attenuates at low frequencies. As a
result, when a large number of symbols of the same
sign are transmitted consecutively, the signal at the
receiver gradually dies away. This effect is called base-
line wander. By employing a circuit that continuously
monitors and compensates for this effect, the probabil-
ity of encountering a receive symbol error is reduced.
Automatic MDI Crossover
During autonegotiation, the ET1011 automatically
detects and sets the required MDI configuration so that
the remote transmitter is connected to the local
receiver and vice versa. This eliminates the need for
crossover cables or crosswired (MDIX) ports. If the
remote device also implements automatic MDI cross-
over, and/or the crossover is implemented in the cable,
the crossover algorithm ensures that only one element
implements the required crossover.
Polarity Inversion Correction
In addition to automatic MDI crossover that is neces-
sary for autonegotiation, 10Base-T, and 100Base-TX
operation, the ET1011 automatically corrects crossover
of the additional two pairs used in 1000Base-T. Polarity
inversion on all pairs is also corrected. Both of these
effects may arise if the cabling has been incorrectly
wired.
Carrier Sense (128-pin TQFP only)
The carrier sense signal (CRS) of the MAC interface is
asserted by the ET1011 whenever the receive medium
is nonidle. In half-duplex mode, CRS may also be
asserted when the transmit medium is nonidle. The
CRS may be enabled on transmit in half-duplex mode
by writing to the PHY configuration register, address
22, bit 15.
Autonegotiation
Autonegotiation is implemented in accordance with
IEEE 802.3. The device supports 10Base-T, 100Base-
TX, and 1000Base-T and can autonegotiate between
them in either half- or full-duplex mode. It can also par-
allel detect 10Base-T or 100Base-TX. If autonegotia-
tion is disabled, a 10Base-T or 100Base-TX link can be
manually selected via the IEEE MII registers.
Pair Skew Correction
In gigabit Ethernet, pair skew (timing differences
between pairs of cable) can result from differences in
length or manufacturing variations between the four
individual twisted-pair cables. The ET1011 automati-
cally corrects for both integer and fractional symbol tim-
ing differences between pairs.
6
Agere Systems Inc.
6 Page TruePHY ET1011
Gigabit Ethernet Transceiver
Pin Information
Pin Diagram, 128-Pin TQFP
Preliminary Data Sheet
April 2004
www.DataSheet4U.com
VDD
DVSS
TXD[3]
TXD[4]
TXD[5]
TXD[6]
TXD[7]
DVSS
DVDDIO
TCK
VDD
DVSS
DVSS
TRST_N
TMS/SYS_CLK_EN_N
TDI/LPED_EN_N
TDO
MAC_IF_SEL[0]
MAC_IF_SEL[1]
MAC_IF_SEL[2]
AUTO_MDI_EN
VDD
DVSS
NC
COMA
VDD
DVSS
AVDDL
AVSS
AVDDH
CLK_IN/XTAL_1
XTAL_2
AVSS
RESET_N
NC
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
AGERE SYSTEMS
ET1011
102 VDD
101 DVSS
100 RXD[4]
99 RXD[5]
98 RXD[6]
97 RXD[7]
96 DVDDIO
95 DVSS
94 SYS_CLK
93 DVSS
92 VDD
91 MDC
90 MDIO
89 MDINT_N
88 DVDDIO
87 PRES
86 LED_COL/MAS_CFG
85 LED_LNK/PAUSE
84 LED_10/SPEED_10
83 LED_100/SPEED_100
82 LED_1000/SPEED_1000
81 VDD
80 DVSS
79 CTRL_1V0
78 CTRL_2V5
77 DVDDIO
76 DVSS
75 LED_DUP/DUPLEX
74 LED_ACT/MDIX_SEL
73 VDD
72 DVSS
71 PHYAD[0]
70 PHYAD[1]
69 PHYAD[2]
68 PHYAD[3]
67 PHYAD[4]
66 NC
65 NC
Figure 6. Pin Diagram for ET1011 in 128-Pin TQFP Package (Top View)
12 Agere Systems Inc.
12 Page | ||
Seiten | Gesamt 30 Seiten | |
PDF Download | [ ET1011 Schematic.PDF ] |
Teilenummer | Beschreibung | Hersteller |
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