HBLXT9785EHC.B2Q E000 Intel, HBLXT9785EHC.B2Q E000 Datasheet - Page 117

• Manufacturer Part Number: HBLXT9785EHC.B2Q E000
• Manufacturer: Intel

Specifications of HBLXT9785EHC.B2Q E000

• Lead Free Status / RoHS Status: Not Compliant

4.2.1.1
Datasheet
Document Number: 249241
Revision Number: 010
Revision Date: 30-May-2006
Figure 7. Interface Signals
Twisted-Pair Interface
The LXT9785/LXT9785E supports either 100BASE-TX or 10BASE-T connections over 100 Ω,
Category 5, Unshielded Twisted-Pair (UTP). Only a transformer, RJ-45, and bypass capacitors are
required to complete this interface. Using Intel's patented waveshaping technology, the transmitter
shapes the outgoing signal to help reduce the need for external EMI filters. Four slew rate settings
(refer to
match the output waveform to the magnetic characteristics. Both transmit and receive terminations
are built into the LXT9785/LXT9785E so no external components are required between the
LXT9785/LXT9785E and the external transformer. The transmitter uses a transformer with a
center tap to help reduce power consumption.
When operating at 100 Mbps, MLT3 symbols are continuously transmitted and received. When not
transmitting data, the LXT9785/LXT9785E generates “IDLE” symbols.
During 10 Mbps operation, LXT9785/LXT9785E encoded data is exchanged. When no data are
being exchanged, the line is left in an idle state with NLPs transmitted to maintain link.
Table 13, “Miscellaneous Signal Descriptions – PQFP” on page
LXT9785 and LXT9785E Advanced 8-Port 10/100 Mbps PHY Transceivers
Management
Port LEDs/
Interface
Interface
Controls
Addr &
MDIX/
DATA
MDIO
Contr
Direct Drive
TXENn
TXDn_0
TXDn_1
TXCLK
RXCLK
RXDn_1
RXDn_0
RXERn
CRS_DVn
MDIOn
MDCn
MDINTn
MDDIS
LEDn_1
LEDn_2
LEDn_3
MDIX_Enb
Mode Select
ADD[4:0]
TPFIPn
TPFONn
TPFINn
TPFOPn
GNDD
VCCD
VCCIO
B3369-01
.01uF
+3.3V
+2.5V
+2.5V
OR
42) allow the designer to
Network
Interface
117