KS8999 Micrel Inc, KS8999 Datasheet - Page 24

• Manufacturer Part Number: KS8999
• Description: IC SWITCH 10/100 9PORT 208PQFP
• Manufacturer: Micrel Inc

Specifications of KS8999

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 208-MQFP, 208-PQFP
• 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
• Mounting: Surface Mount
• Jtag Support: No
• Operating Temperature Classification: Commercial
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With: 576-1023 - BOARD EVAL EXPERIMENT FOR KS8999
• Lead Free Status / RoHS Status: Not Compliant, Contains lead / RoHS non-compliant

KS8999
MII Interface Operation
The MII (Media Independent Interface) operates in either a MAC or PHY mode. In the MAC mode, the KS8999 MII acts like
a MAC and in the PHY mode, it acts like a PHY device. This interface is specified by the IEEE 802.3 committee and provides
a common interface between physical layer and MAC layer devices. There are two distinct groups, one being for transmission
and the other for receiving. The table below describes the signals used in this interface in MAC and PHY modes.
This interface is a nibble wide data interface and therefore runs at _ the network bit rate (not encoded). Additional signals on
the transmit side indicate when data is valid or when an error occurs during transmission. Likewise, the receive side has
indicators that convey when the data is valid and without physical layer errors.
For half-duplex operation there is a signal that indicates a collision has occurred during transmission.
KS8999
PHY Mode Connection
External MAC
Controller Signals
MTXEN
MTXER
MTXD3
MTXD2
MTXD1
MTXD0
MTXC
MCOL
MCRS
MRXDV
MRXER
MRXD3
MRXD2
MRXD1
MRXD0
MRXC
KS8999
PHY Signals
MTXEN
MTXER
MTXD[3]
MTXD[2]
MTXD[1]
MTXD[0]
MTXC
MCOL
MCRS
MRXDV
Not used
MRXD[3]
MRXD[2]
MRXD[1]
MRXD[0]
MRXC
Description
Transmit enable
Transmit error
Transmit data bit 3
Transmit data bit 2
Transmit data bit 1
Transmit data bit 0
Transmit clock
Collision detection
Carrier sense
Receive data valid
Receive error
Receive data bit 3
Receive data bit 2
Receive data bit 1
Receive data bit 0
Receive clock
Table 1. MII Signals
24
MAC Mode Connection
External
PHY Signals
MTXEN
MTXER
MTXD3
MTXD2
MTXD1
MTXD0
MTXC
MCOL
MCRS
MRXDV
MRXER
MRXD3
MRXD2
MRXD1
MRXD0
MRXC
KS8999
MAC Signals
MRXDV
Not used
MRXD[3]
MRXD[2]
MRXD[1]
MRXD[0]
MTXC
MCOL
MCRS
SMTXEN
MTXER
MTXD[3]
MTXD[2]
MTXD[1]
MTXD[0]
MRXC
January 2005
Micrel