VSC8641XKO Vitesse Semiconductor Corp, VSC8641XKO Datasheet - Page 28

• 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

Figure 8.
3.10.1
3.10.2
Revision 4.3
August 2009
ActiPHY State
Low-Power State
In the low-power state, all major digital blocks are powered down. However, the
following functionality is provided:
•
•
In this state, the PHY monitors the media interface pins for signal energy. The PHY
comes out of low-power state and transitions to the normal operating state when signal
energy is detected on the media. This happens when the PHY is connected to one of the
following:
•
•
•
In the absence of signal energy on the media pins, the PHY transitions from the low-
power state to the LP wake-up state periodically based on the programmable sleep
timer (register bits 20E.14:13). The actual sleep time duration is randomized from –
80 ms to +60 ms to avoid two linked PHYs in ActiPHY Mode entering a lock-up state
during operation.
Link Partner Wake-Up State
In this state, the PHY attempts to wake up the link partner. FLP bursts are sent on
alternating pairs A and B of the Cat5 media for a duration of two seconds.
Signal Sent
SMI interface (MDC, MDIO, MDINT)
CLKOUT
Auto-negotiation capable link partner
Auto-negotiation incapable (blink/forced) link partner (100BASE-TX or 10BASE-T)
Another PHY in ActiPHY LP wake-up state
FLP Burst
LP Wake-up
State
Sleep Timer Expires
Low-Power State
Timeout Timer Expires and
Auto-Negotiation Enabled
Signal Energy Detected on
Media
Operation
Normal
Functional Descriptions
VSC8641 Datasheet
Page 28