FLLXT1000BA.C4QE000 Intel, FLLXT1000BA.C4QE000 Datasheet - Page 27

• Manufacturer Part Number: FLLXT1000BA.C4QE000
• Manufacturer: Intel

Specifications of FLLXT1000BA.C4QE000

• Lead Free Status / RoHS Status: Not Compliant

2.3.2.2
2.3.2.3
2.3.2.4
Datasheet
Document #: 249276
Revision #: 002
Rev. Date: 07/20/01
Figure 6. GMII Data Interface
GMII Mode (1000 BASE-T)
In GMII Mode, the LXT1000 supplies the following:
The MAC supplies a 125 MHz GTX clock, eight transmit data bits, and a transmit error signal. In
the GMII mode, the LXT1000 drives a 25 MHz reference clock on its TX_CLK output ball for use,
such as the MAC state machines. See
The GMII mode supports carrier extension and packet concatenation in both the transmit and
receive directions. These functions are enabled through the TX_ER and RX_ER balls. Refer to
“1000 Mbps Operation” on page
MII Mode (10/100BASE-T)
The MII mode provides fallback support for 10/100 links when the GMII configuration of the
MAC interface is selected. In this mode, the LXT1000 provides four receive data bits, 25 or 2.5
MHz transmit and receive clocks, and an error flag for received data. It also provides a carrier
sense signal and a collision detect signal. The LXT1000 drives unused balls on the receive bus to
ground. The transmit clock is driven on the TX_CLK ball, and GTX_CLK is ignored and can be
left open. The MAC drives four transmit data bits and a transmit error ball.
Serial Mode (10BASE-T)
The Serial 10M mode supports legacy MACs when the link speed falls back to 10 Mbps. This
mode is selected by setting the SER10 input High (otherwise MII mode is chosen for 10 operation),
and is only available when the GMII configuration of the MAC interface is selected. The interface
consists of a single data bit in each direction, 10 MHz transmit and receive clocks driven by the
LXT1000, carrier sense, and collision detect (see
•
•
•
•
•
RX_CLK (125 MHz)
Eight receive data bits
Carrier sense
Collision detect
Receive error signal
GMAC
46.
TX_EN
TX_ER
GTX_CLK
CRS
TX_CLK
RX_CLK
COL
Figure
TXD<7:0>
RXD<7:0>
RX_ER
RX_DV
6, which shows a GMII configuration.
Figure
Gigabit Ethernet Transceiver — LXT1000
7).
LXT1000
27