VSC8641XKO Vitesse Semiconductor Corp, VSC8641XKO Datasheet - Page 33

• 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

Table 3.
3.12.3
Revision 4.3
August 2009
Mode
10
11
12
13
14
15
6
7
8
9
Function Name
Link10/100/activity
Reserved
Duplex/collision
Collision
Activity
Reserved
Auto-negotiation fault
Reserved
Force LED off
Force LED on
LED Mode and Function Summary (continued)
LED Behavior
Several LED behaviors can be programmed into the VSC8641 device. Use the settings
in register 17E to program LED behavior, which includes the following:
LED Combine Enables an LED to display status for a combination of primary and
secondary modes. This can be enabled or disabled for each LED pin. For example, a
copper link running in 1000BASE-T mode and activity present can be displayed with one
LED by configuring an LED pin to Link1000/Activity mode. The LED asserts when linked
to a 1000BASE-T partner and also blinks or pulse-stretches when activity is either
transmitted by the PHY or received by the link partner. The combine feature when
disabled only allows status of the primary function selected. In this example, only
Link1000 asserts the LED, and the secondary mode, activity, does not display if the
combine feature is disabled.
LED Blink or Pulse-Stretch This behavior is used for activity and collision indication.
This can be uniquely configured for each LED pin. Activity and collision events can occur
randomly and intermittently throughout the link-up period. For activity or collision to be
visually seen, these two modes are provided. Blink is a 50% duty cycle oscillation of
asserting and de-asserting an LED pin. Pulse-stretch guarantees that an LED is
asserted and de-asserted for a specific period of time when activity is either present or
not present. These rates can also be configured using a register setting.
Rate of LED Blink or Pulse-Stretch
length when blink/pulse-stretch is enabled on an LED pin. The blink rate, which
alternates between a high and low voltage level at a 50% duty cycle, can be set to
2.5 Hz, 5 Hz, 10 Hz, or 20 Hz. For pulse-stretch, this can be set to 50 ms, 100 ms,
200 ms, or 400 ms.
LED State and Description
1 = No link in 10BASE-T or 100BASE-TX.
0 = Valid 10BASE-T or 100BASE-TX link.
Blink or pulse-stretch = Valid 10BASE-T or 100BASE-TX link with activity
present.
1 = Link established in half-duplex mode, or no link established.
0 = Link established in full-duplex mode.
Blink or pulse-stretch = Link established in half-duplex mode but collisions are
present.
1 = No collision detected.
Blink or pulse-stretch = Collision detected.
1 = No activity present.
Blink or pulse-stretch = Activity present (becomes TX activity present if
register bit 30.14 is set to 1).
1 = No auto-negotiation fault present.
0 = Auto-negotiation fault occurred.
1 = De-asserts the LED.
0 = Asserts the LED.
This controls the LED blink rate or pulse-stretch
Functional Descriptions
VSC8641 Datasheet
Page 33