KSZ9021GN TR Micrel Inc, KSZ9021GN TR Datasheet - Page 24

• Manufacturer Part Number: KSZ9021GN TR
• Description: Specifications: Number of Drivers/Receivers: 8/8 ; Type: Transceiver ; Voltage - Supply: 3.135 V ~ 3.465 V ; Package / Case: 64-VFQFN Exposed Pad ; Packaging: Tape & Reel (TR) ; Protocol: Gigabit Ethernet ; Lead Free Status: Lead Free ; RoHS Stat
• Manufacturer: Micrel Inc

Micrel, Inc.
MII Signal Definition
The following table describes the MII signals. Refer to Clause 22 of the IEEE 802.3 Specification for detailed
information.
MII Signal Diagram
The KSZ9021GN MII pin connections to the MAC are shown in the following figure.
September 2010
MII
Signal Name
(per spec)
TX_CLK
TX_EN
TXD[3:0]
TX_ER
RX_CLK
RX_DV
RXD[3:0]
RX_ER
CRS
COL
MII
Signal Name
(per KSZ9021GN)
TX_CLK
TX_EN
TXD[3:0]
TX_ER
RX_CLK
RX_DV
RXD[3:0]
RX_ER
CRS
COL
Figure 5. KSZ9021GN MII Interface
Pin Type
(with respect
to PHY)
Output
Input
Input
Input
Output
Output
Output
Output
Output
Output
Table 4. MII Signal Definition
Pin Type
(with respect
to MAC)
Input
Output
Output
Output
Input
Input
Input
Input
Input
Input
24
Description
(25MHz for 100Mbps, 2.5MHz for
10Mbps)
Transmit Data [3:0]
Transmit Error
(25MHz for 100Mbps, 2.5MHz for
10Mbps)
Receive Data Valid
Receive Data [3:0]
Receive Error
Carrier Sense
Collision Detected
Transmit Reference Clock
Transmit Enable
Receive Reference Clock
M9999-091010-1.1
KSZ9021GN