KSZ8993MI Micrel Inc, KSZ8993MI Datasheet - Page 50

• Manufacturer Part Number: KSZ8993MI
• Description: IC SWITCH 10/100 W/TXRX 128PQFP
• Manufacturer: Micrel Inc

Specifications of KSZ8993MI

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• Number Of Primary Switch Ports: 3
• Internal Memory Buffer Size: 32
• Operating Supply Voltage (typ): 1.8/2.5/3.3V
• 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): 85C
• Operating Temperature (min): -40C
• Pin Count: 128
• Mounting: Surface Mount
• Jtag Support: No
• Operating Supply Voltage (max): 1.89/3.465V
• Operating Supply Voltage (min): 1.71/3.135V
• Power Dissipation: 800mW
• Supply Current: 0.1/0.19A
• Operating Temperature Classification: Industrial
• Data Rate: 100Mbps
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-2124; KSZ8993MI

Register 3 (0x03): Global Control 1
Bit
7
6
5
4
3
2
1
0
Register 4 (0x04): Global Control 2
Bit
7
6
5
Micrel, Inc.
October 2008
Repeater
mode
IEEE 802.3x
Transmit
direction flow
control enable
IEEE 802.3x
Receive
direction flow
control enable
Frame Length
field check
Fast age
enable
Aggressive
back off enable
Unicast port-
VLAN
mismatch
discard
Multicast storm
protection
disable
Mode
Name
Pass all frames
Aging enable
Name
Back pressure
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
= 1, switch all packets including bad ones. Used
solely for debugging purposes. Works in conjunction
with sniffer mode only.
0 = normal mode
1 = repeater mode (half duplex Hub mode)
= 1, will enable transmit direction flow control feature.
= 0, will not enable transmit direction flow control
feature.
= 1, will enable receive direction flow control feature.
= 0, will not enable receive direction flow control
feature.
1 = will check frame length field in the IEEE packets.
If the actual length does not match, the packet will be
dropped
1 = enable age function in the chip
0 = disable age function in the chip
1 = turn on fast age (800us)
1 = enable more aggressive back off algorithm in half
duplex mode to enhance performance. This is not an
IEEE standard.
Description
This feature is used for port-VLAN (described in reg.
17, reg. 33, …)
= 1, all packets can not cross VLAN
= 0, unicast packets (excluding
unkown/multicast/broadcast) can cross VLAN
boundary
Note: Port mirroring is not supported if this bit is set to
“0”.
= 1, “Broadcast Storm Protection” does not include
multicast packets. Only
= 0, “Broadcast Storm Protection” includes
DA = FFFFFFFFFFFF and DA[40] = 1 packets.
= 1, carrier sense based backpressure is selected
= 0, collision based backpressure is selected
(for Length/Type field < 1500).
boundary
DA = FFFFFFFFFFFF packets will be
regulated.
50
Default
0
0
1
1
0
1
0
SMAC (pin
69) value
during
reset.
Default
1
1
1
M9999-020606
KSZ8993M/ML