KSZ8993ML Micrel Inc, KSZ8993ML Datasheet - Page 44
KSZ8993ML
Manufacturer Part Number
KSZ8993ML
Description
2+1 Port 10/100 Switch W/Tranceivers & Frame Buffers, 128-Ld PQFP( )
Manufacturer
Micrel Inc
Specifications of KSZ8993ML
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)
70C
Operating Temperature (min)
0C
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
Commercial
Data Rate
100Mbps
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
576-2125
KSZ8993ML
KSZ8993ML
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
KSZ8993MLI
Manufacturer:
MICREL/麦瑞
Quantity:
20 000
Loopback Support
The KSZ8993M provides loopback support for remote diagnostic of failure. In loopback mode, the speed at both
PHY ports needs to be set to 100BASE-TX, and the “Priority Buffer reserve” bit needs to be set to 48 pre-
allocated buffers per output queue. The latter is required to prevent loopback packet drops and is achieved by
setting register 4 bit 0 to ‘1’.
Bit 0 of registers 29 and 45 is used to enable loopback for ports 1 and 2, respectively.
Alternatively, the MII Management register 0, bit 14 can be used to enable loopback.
Loopback is conducted between the KSZ8993M’s two PHY ports. The loopback path starts at the “Originating.”
PHY ports receive inputs (RXP/RXM), wraps around at the “loopback” PHY port’s PMD/PMA, and ends at the
“Originating” PHY port’s transmit outputs (TXP/TXM). The KSZ8993M loopback path is illustrated in the following
figure.
Micrel, Inc.
October 2008
Figure 12. Loopback Path
44
M9999-020606
KSZ8993M/ML