82544EI Datasheet, PDF (16/52 Pages) Intel Corporation – Gigabit Ethernet Controller

82544EI Gigabit Ethernet Controller Networking Silicon Datasheet
The 82544EI device has a special GMII test mode for the IEEE Unfiltered Jitter Test. This test
mode reuses the TBI signals as GMII outputs. After PHY conformance testing is completed, it is
permissible to gang the TBI interface pins together to reduce the number of pulldown resistors
needed.
Signal Name
TBI_MODE
TX_DATA[9:0]
GTX_CLK
EWRAP
RX_DATA[9:0]
RBC0
RBC1
Type
I
O
O
O
I
I
I
Name and Function
TBI Mode Enable. This signal forces the device into TBI mode when
TBI_MODE is asserted (high).
Transmit Data. Parallel TBI data bus to be transmitted through a
serializer/deserializer (SERDES). If TBI mode is not used, connect these
pins to ground through pulldown resistors. During GMII test mode these
pins become GMII outputs.
Transmit Clock. Operates at 125 MHz. If TBI mode is not used, connect
this ball to ground through a pulldown resistor. During GMII test mode
this pin becomes the transmit clock test output.
Enable Wrap. EWRAP is low in normal operation. When it is high, the
SERDES device is forced to transceiver loopback the serialized transmit
data to the receiver. If TBI mode is not used, connect this ball to ground
through a pulldown resistor.
Receive Data. Parallel TBI data bus received from a serializer/
deserializer (SERDES). If TBI mode is not used, connect these balls to
ground through a pulldown resistor. During GMII test mode these pins
become GMII outputs.
Receive Clock. RBC0 is the 62.5 MHz receive clock. If TBI mode is not
used, connect this ball to ground through a pulldown resistor. During
GMII test mode this pin becomes an output.
Receive Clock: RBC1 is the 62.5 MHz receive clock shifted 180
degrees from RBC0. If TBI mode is not used, connect this ball to ground
through a pulldown resistor. During GMII test mode this pin becomes the
receive clock test output.
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Datasheet