KSZ8841-16MVLI Micrel Inc, KSZ8841-16MVLI Datasheet - Page 42

• Manufacturer Part Number: KSZ8841-16MVLI
• Description: Single Ethernet Port + Generic (8, 16-bit) Bus Interface( )
• Manufacturer: Micrel Inc

Specifications of KSZ8841-16MVLI

• Controller Type: Ethernet Controller, MAC
• Interface: Bus
• Voltage - Supply: 3.1 V ~ 3.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Operating Supply Voltage (typ): 3.3V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1632 - BOARD EVALUATION KSZ8841-16MVL
• Current - Supply: -
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-2114; KSZ8841-16MVLI

Loopback Support
The KSZ8841M provides Near-end (Remote) loopback support for remote diagnostic of failure. In loopback mode, the
speed at the PHY port will be set to 100BASE-TX full-duplex mode.
Near-end (Remote) Loopback
Near-end (Remote) loopback is conducted at PHY port 1of the KSZ8841M. The loopback path starts at the PHY port’s
receive inputs (RXP1/RXM1), wraps around at the same PHY port’s PMD/PMA, and ends at the PHY port’s transmit
outputs (TXP1/TXM1).
Bit [1] of register P1PHYCTRL is used to enable near-end loopback for port 1. Alternatively, Bit [9] of register P1SCSLMD
can also be used to enable near-end loopback. The ports 1 near-end loopback path is illustrated in the following Figure
12.
October 2007
Micrel, Inc.
RXP1 /
RXM1
Figure 12. PHY Port 1 Near-end (Remote) Loopback Path
Bus I/F Unit
PMD1/PMA1
Near-end (remote)
QMU/DMA
RXQ/TXQ
PHY Port 1
MAC1
PCS1
Loopback
42
TXP1 /
TXM1
KSZ8841-16/32 MQL/MVL/MBL
M9999-102207-1.6