KSZ8995MA Micrel Inc, KSZ8995MA Datasheet - Page 23

• Manufacturer Part Number: KSZ8995MA
• Description: IC SWITCH 10/100 5PORT 128PQFP
• Manufacturer: Micrel Inc

Specifications of KSZ8995MA

• Data Rate: 100Mbps
• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 128-MQFP, 128-PQFP
• No. Of Ports: 5
• Ethernet Type: IEEE 802.3u
• Supply Voltage Range: 1.7V To 1.9V, 3.15V To 3.45V
• Operating Temperature Range: 0°C To +70°C
• Digital Ic Case Style: QFP
• No. Of Pins: 128
• Number Of Primary Switch Ports: 5
• Internal Memory Buffer Size: 64
• 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 Temperature Classification: Commercial
• Interface Type: MII, SNI
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 576-1607 - BOARD EVAL EXPERIMENT KSZ8995MA
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS Compliant
• Other names: 576-1039

detect, and FXSDx ‘L’ is below the 1.25V reference to indicate no signal. When FXSDx is below 0.6V then 100BASE-FX mode
is disabled. Since there is no auto-negotiation for 100BASE-FX mode, ports 4 and 5 must be forced to either full or half-duplex.
Note that strap-in options exist to set duplex mode for port 4, but not for port 5.
100BASE-FX Far End Fault
Far end fault occurs when the signal detection is logically false from the receive fiber module. When this occurs, the
transmission side signals the other end of the link by sending 84 1s followed by a zero in the idle period between frames. The
far end fault may be disabled through register settings.
10BASE-T Transmit
The output 10BASE-T driver is incorporated into the 100BASE-T driver to allow transmission with the same magnetics. They
are internally wave-shaped and pre-emphasized into outputs with a typical 2.3V amplitude. The harmonic contents are at least
27dB below the fundamental when driven by an all-ones Manchester-encoded signal.
10BASE-T Receive
On the receive side, input buffer and level detecting squelch circuits are employed. A differential input receiver circuit and a
PLL perform the decoding function. The Manchester-encoded data stream is separated into clock signal and NRZ data. A
squelch circuit rejects signals with levels less than 400mV or with short pulsewidths in order to prevent noises at the RXP or
RXM input from falsely triggering the decoder. When the input exceeds the squelch limit, the PLL locks onto the incoming signal
and the KS8995MA decodes a data frame. The receiver clock is maintained active during idle periods in between data
reception.
Power Management
The KS8995MA features a per port power down mode. To save power the user can power down ports that are not in use by
setting port control registers or MII control registers. In addition, it also supports full chip power down mode. When activated,
the entire chip will be shutdown.
MDI/MDI-X Auto Crossover
The KS8995MA supports MDI/MDI-X auto crossover. This facilitates the use of either a straight connection CAT-5 cable or
a crossover CAT-5 cable. The auto-sense function will detect remote transmit and receive pairs, and correctly assign the
transmit and receive pairs from the Micrel device. This can be highly useful when end users are unaware of cable types and
can also save on an additional uplink configuration connection. The auto crossover feature may be disabled through the port
control registers.
Auto-Negotiation
The KS8995MA conforms to the auto-negotiation protocol as described by the 802.3 committee. Auto-negotiation allows
unshielded twisted pair (UTP) link partners to select the best common mode of operation. In auto-negotiation the link partners
advertise capabilities across the link to each other. If auto-negotiation is not supported or the link partner to the KS8995MA
is forced to bypass auto-negotiation, then the mode is set by observing the signal at the receiver. This is known as parallel mode
because while the transmitter is sending auto-negotiation advertisements, the receiver is listening for advertisements or a fixed
signal protocol.
The flow for the link setup is shown in Figure 4.
May 2005
KS8995MA
and Set Link Mode
Force Link Setting
Auto Negotiation
Auto-Negotiation
Bypass
Start
Yes
Figure 4. Auto-Negotiation
Auto-Negotiation
Attempt
No
23
100BASE-TX Idles
Link Mode Set ?
Link Mode Set
Operation
Listen for
Join Flow
Parallel
Yes
Listen for 10BASE-T
Link Pulses
No
M9999-051305
Micrel, Inc.