KSZ8993 Micrel Inc, KSZ8993 Datasheet - Page 12

• 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
KS8993
Group
LED[3][2:0]
I/O Names
MRXD[3:1]
LED[1][0]
LED[2][3]
LED[2][2]
LED[2][1]
LED[2][0]
LED[3][3]
MIIS[1:0]
DISAN3
MRXD0
MCOL
Active Status
H
Description
Programs buffer allocation per port at reset time. Use the following table to select the
option.
Pulled low = 170 buffers (default).
Pulled high = adaptive mode.
Programs MAC address aging in the address look-up table at reset time. Aging
eliminates old entries from the table.
Pulled high = 5 minute aging (default).
Pulled low = disable.
Programs back pressure enable at reset time.
Pulled high = enable (default).
Pulled low = disable.
Programs aggressive back off in half-duplex at reset time.
Pulled high = enable (default).
Pulled low = disable.
Programs no excessive collision drop at reset time.
Pulled high = enable (default).
Pulled low = disable.
RESERVED.
Use external pulldown resistor if VDD_IO is 3.3V and LED[3][3] is being used. If
VDD_IO is not 3.3V or this LED is not used, then no pull-down is required ( floating).
Programs force 100BaseTX mode at reset time. Use the table below to set this mode
on the appropriate port. Assuming the corresponding port auto-negotiation is disabled.
Signal
LED[3][2]
LED[3][1]
LED[3][0]
Programs force full-duplex mode at reset time. Use the table below to set this mode
on the appropriate port. Assuming the corresponding port auto-negotiation is disabled.
Signal
MRXD[3]
MRXD[2]
MRXD[1]
Programs “port 1 auto-negotiation disable” at reset time.
Pulled high = auto-negotiation disable.
Pulled low = auto-negotiation enable (default).
Programs “port 2 auto-negotiation disable” at reset time.
Pulled high = auto-negotiation disable.
Pulled low = auto-negotiation enable (default).
Programs “port 3 auto-negotiation disable” at reset time.
Pulled high = auto-negotiation disable (default)
Pulled low = auto-negotiation enable
Selects external MII port operation mode. Use the table below to select the external
port mode.
MIIS
1
L
L
H
H
0
L
H
L
H
Port
3
2
1
Port
3
2
1
Selection
External MII disable (default)
MII reverse mode
MII forward mode
7-wire (SNI) mode
12
Force 10BaseTX
Pulled low
Pulled low
Pulled low
Force Half-Duplex
Pulled low (default)
Pulled low (default)
Pulled low (default)
Force 100BaseTX
Pulled high (default)
Pulled high (default)
Pulled high (default)
Force Full-Duplex
Pulled high
Pulled high
Pulled high
May 2005
Micrel