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PDF VSC8641 Data sheet ( Hoja de datos )
| Número de pieza | VSC8641 | |
| Descripción | 10/ 100/ 1000Base-T PHY | |
| Fabricantes | Vitesse | |
| Logotipo |  |
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VSC8641
10/100/1000BASE-T PHY with RGMII
and GMII MAC Interface
Datasheet
VMDS-10211
Revision 4.3
August 2009
1 page  
VSC864w1wwD.DaattaaSshheeete4Ut .com
Contents
5.2.2 Consumption with 100BASE-TX Link .......................................................... 76
5.2.3 Consumption with 10BASE-T Link.............................................................. 77
5.2.4 Consumption with No Link and ActiPHY Enabled .......................................... 78
5.2.5 Consumption with No Link and ActiPHY Disabled ......................................... 79
5.2.6 Consumption in Power-Down Mode............................................................ 80
5.2.7 Consumption in Reset State ..................................................................... 80
5.3 AC Characteristics .............................................................................................. 81
5.3.1 Reference Clock Input ............................................................................. 81
5.3.2 Clock Output .......................................................................................... 81
5.3.3 JTAG Interface ....................................................................................... 82
5.3.4 SMI Interface ......................................................................................... 83
5.3.5 Device Reset .......................................................................................... 84
5.3.6 GMII Transmit ........................................................................................ 85
5.3.7 GMII Receive ......................................................................................... 86
5.3.8 MII Transmit .......................................................................................... 87
5.3.9 MII Receive............................................................................................ 88
5.3.10 RGMII Uncompensated ............................................................................ 88
5.3.11 RGMII Compensated ............................................................................... 90
5.4 Operating Conditions .......................................................................................... 91
5.5 Stress Ratings ................................................................................................... 92
6 Pin Descriptions ...............................................................................93
6.1 Pin Diagram (VSC8641XJF).................................................................................. 94
6.2 Pins By Function (VSC8641XJF)............................................................................ 95
6.2.1 Twisted Pair Interface .............................................................................. 95
6.2.2 GMII/RGMII MAC Interface ...................................................................... 95
6.2.3 Serial Management Interface (SMI)........................................................... 98
6.2.4 JTAG ..................................................................................................... 99
6.2.5 Miscellaneous......................................................................................... 99
6.2.6 Power Supply ....................................................................................... 100
6.2.7 Power Supply and Associated Function..................................................... 101
6.3 Pins by Number (VSC8641XJF)........................................................................... 102
6.4 Pins by Name (VSC8641XJF).............................................................................. 103
6.5 Pin Diagram (VSC8641XKO, VSC8641XKO-03) ..................................................... 104
6.6 Pins by Function (VSC8641XKO, VSC8641XKO-03) ............................................... 105
6.6.1 Twisted Pair Interface ............................................................................ 105
6.6.2 GMII/RGMII MAC Interface .................................................................... 105
6.6.3 Serial Management Interface (SMI)......................................................... 108
6.6.4 JTAG ................................................................................................... 109
6.6.5 Miscellaneous....................................................................................... 109
6.6.6 Power Supply ....................................................................................... 110
6.6.7 Power Supply and Associated Function..................................................... 111
6.7 Pins by Number (VSC8641XKO, VSC8641XKO-03) ................................................ 112
6.8 Pins by Name (VSC8641XKO, VSC8641XKO-03) ................................................... 113
7 Package Information......................................................................114
7.1 Package Drawings ............................................................................................ 114
7.2 Thermal Specifications ...................................................................................... 117
7.3 Moisture Sensitivity .......................................................................................... 117
8 Design Considerations ...................................................................118
8.1 RX_CLK Can Reach as High as 55% Duty Cycle .................................................... 118
8.2 First SMI Write Fails after Software Reset ............................................................ 118
8.3 Link-Up Issue In Forced 100BASE-TX Mode .......................................................... 118
Revision 4.3
August 2009
Page 5
5 Page 
VSC864w1wwD.DaattaaSshheeete4Ut .com
Revision History
VSC8641 device violates IEEE specification 802.3. The VSC8641 requires an
off-chip and an on-chip pull-up resistor for the interface to work properly.
Setting the Internal RGMII Timing Compensation Value There are two
inter-related registers that control the internal RGMII skew timing compensation in
which register 23.8 can potentially overwrite register 28E.
10BASE-T Harmonics at 30 MHz and 50 MHz Marginally Violates
Specification The IEEE 802.3 specification states that in 10BASE-T mode, when
the DO circuit is driven by an all-ones, Manchester-encoded signal, any harmonic
measured on the TD circuit must be at least 27 dB below the fundamental. In
VSC8641, this specification is marginally violated at 30 MHz and 50 MHz when this
measurement is made under corner conditions.
Revision 4.1
Revision 4.1 of this datasheet was published in July 2007. The following is a summary
of the changes implemented in the datasheet:
• VSC8641-03 is now available. It has an extended operating temperature range of
–40 °C ambient to 90 °C case.
• A design guideline was added regarding delays in the link-up process while in the
forced 100BASE-TX mode with the automatic crossover detection feature enabled.
• The following design guidelines were removed, because they no longer apply to the
device: Remote Fault Status; DSP Optimization Script Required; Default Port Type
Incorrect; and Core 1.2 V Supply Needs to Meet Specific Range.
Revision 4.0
Revision 4.0 of this datasheet was published in December 2006. The following is a
summary of the changes implemented in the datasheet:
• The VSC8641KO package was removed from the datasheet. VSC8641XKO remains
available.
• In the jumbo packet register settings (28E.11:10), the packet lengths were
updated.
• In several current consumption specifications, the values for total power at 2.5 V
were corrected. The previous values were slightly elevated.
• In the DC characteristics for VDDIO at 3.3 V, both the input and output leakage
current parameters (IILEAK and IOLEAK) were increased from ±36 µA to ±43 µA.
• In the DC characteristics for VDDIO at 2.5 V, the minimum input high voltage (VIH)
was increased from 1.7 V to 2.0 V for all pins, except for GMII input pins, which
remain at 1.7 V minimum. Both the input and output leakage current parameters
(IILEAK and IOLEAK) were increased from ±25 µA to ±35 µA.
• Current consumption specifications were added for both the power-down mode and
the reset state.
Revision 4.3
August 2009
Page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet VSC8641.PDF ] | |
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