VSC8641XKO Vitesse Semiconductor Corp, VSC8641XKO Datasheet - Page 37

• Manufacturer Part Number: VSC8641XKO
• Description: IC PHY 10/100/1000 100-LQFP
• Manufacturer: Vitesse Semiconductor Corp
• Type: PHY Transceiverr

Specifications of VSC8641XKO

• Number Of Drivers/receivers: 1/1
• Protocol: Gigabit Ethernet
• Voltage - Supply: 2.5V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 100-LQFP
• Case: TQFP
• Dc: 07+
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 907-1031

3.13.7
Revision 4.3
August 2009
anomalous coupling between cable pairs. These conditions can all prevent the device
from establishing a link at any speed.
Cable Pair Termination
impedance between the positive and negative cable terminals. The IEEE standard 802.3
allows for a termination of as high as 115 Ω or as low as 85 Ω. If the termination falls
outside of this range, it is reported by the VeriPHY diagnostics as an anomalous
termination. The diagnostics can also determine the presence of an open or shorted
cable pair.
Cable Length When the Cat5 cable in an installation is properly terminated, VeriPHY
reports the approximate cable length in meters.
IEEE 1149.1 JTAG Boundary Scan
The VSC8641 device supports the Test Access Port (TAP) and boundary-scan
architecture described in the IEEE standard 1149.1. The device includes an
IEEE 1149.1-compliant test interface, often referred to as a “JTAG TAP Interface.”
The JTAG boundary-scan logic on the VSC8641 device, accessed using its TAP interface,
consists of a boundary-scan register and other logic control blocks. The TAP controller
includes all IEEE-required signals (TMS, TCK, TDI, and TDO), in addition to the optional
asynchronous reset signal NTRST.
The following illustration shows the TAP and boundary-scan architecture.
Proper termination of Cat5 cable requires 100-Ω differential
Functional Descriptions
VSC8641 Datasheet
Page 37