VSC8641XKO Vitesse Semiconductor Corp, VSC8641XKO Datasheet - Page 35

• 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

3.13.3
Figure 13.
3.13.4
Figure 14.
Revision 4.3
August 2009
Link Partner
Link Partner
•
•
Far-end Loopback
The far-end loopback testing feature is enabled by setting register bit 27E.10 to 1.
When enabled, it forces incoming data from a link partner on the current media
interface to be retransmitted back to the link partner on the media interface as shown
in the following illustration. In addition, the incoming data also appears on the receive
data pins of the MAC interface. Data present on the transmit data pins of the MAC
interface is ignored when using this testing feature.
Far-End Loopback
Near-End Loopback
When the near-end loopback testing feature is enabled (by setting the device register
bit 0.14 to 1), data on the transmit data pins (TXD) is looped back onto the device
received data pins (RXD) as shown in the following illustration. When using this testing
feature, no data is transmitted over the network.
Near-End Loopback
After receiving a packet on the media interface, register bit 18E.15 is set and
cleared after being read. The packet then is counted by either the CRC good
counter or the CRC error counter. Both CRC counters are also automatically cleared
when read.
The CRC good counter’s highest value is 9,999 packets. Upon receiving the next
packet, the counter clears and continues to count additional packets beyond that
value. The CRC error counter saturates when it reaches its maximum counter limit
of 255 packets.
Cat5
Cat5
RX
TX
RX
TX
SimpliPHY
SimpliPHY
TXD
RXD
RXD
TXD
Functional Descriptions
VSC8641 Datasheet
MAC
MAC
Page 35