KSZ8993 Micrel Inc, KSZ8993 Datasheet - Page 22

• Manufacturer Part Number: KSZ8993
• Description: IC SWITCH 10/100 3PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KSZ8993

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• Number Of Primary Switch Ports: 3
• Internal Memory Buffer Size: 64
• Operating Supply Voltage (typ): 2.5/3.3V
• Fiber Support: Yes
• Integrated Led Drivers: Yes
• Phy/transceiver Interface: MII/SNI
• Power Supply Type: Analog/Digital
• Package Type: PQFP
• Data Rate (typ): 10/100Mbps
• Vlan Support: Yes
• Operating Temperature (max): 70C
• Operating Temperature (min): 0C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Supply Voltage (max): 2.75/3.6V
• Operating Supply Voltage (min): 2.35V
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-1032

KS8993
SNI Interface (7-wire) Operation
The SNI (Serial Network Interface) is intended to interface with some controllers used for network layer protocol processing.
KS8993 acts like a PHY device to external controllers. This interface can be directly connected to these type of devices. The
signals are divided into two groups, one being for transmission and the other being the receive side. The signals involved are
described in the table below.
This interface is a bit wide data interface and therefore runs at the network bit rate (not encoded). An additional signal on the
transmit side indicates when data is valid. Likewise, the receive side has an indicator that conveys when the data is valid.
For half-duplex operation there is a signal that indicates a collision has occurred during transmission.
KS8993
SNI Signal
TXEN
TXD
TXC
COL
CRS
RXD
RXC
Description
Transmit enable
Serial transmit data
Transmit clock
Collision detection
Carrier sense
Serial receive data
Receive clock
MTXD[0]
MCOL
MRXD[0]
KS8993 SNI Signal
MTXEN
MTXCLK
MRXDV
MRXCLK
Table 3. SNI Signal
22
KS8993 Input/Output
Input
Input
Output
Output
Output
Output
Output
May 2005
Micrel