FLLXT1000BA.C4QE000 Intel, FLLXT1000BA.C4QE000 Datasheet - Page 30

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

Specifications of FLLXT1000BA.C4QE000

• Lead Free Status / RoHS Status: Not Compliant

LXT1000 — Gigabit Ethernet Transceiver
2.3.4.1
30
Figure 10. Data Flow Between PHY and Mac
Figure 10
transmitted from the MAC through the PHY and onto the twisted-pair. Receive data traffic is data
received from on the twisted-pair to the PHY and passed on to the receiving MAC.
Transmit Mode – Data Traffic from MAC to PHY
Each frame transmitted from the MAC to the PHY begins on an arbitrarily designated even byte,
and each byte thereafter alternates between odd and even. In full duplex operation, the MAC
appends a single additional /R/ code group to the code-group stream to ensure that the subsequent /
I/ is aligned on an even-numbered code-group boundary and the end-of-packet delimiter is
complete according IEEE 802.3z Clause 36.2.4.14.1 (i.e., frames must end on an odd byte and the
next even byte starts the subsequent /I/).
2.3.4.1.1 Frames Ending on an Even Byte
The PHY interprets the frames correctly but must realign itself so that they end on an even code
group. When the PHY resets or realigns, it changes the even and odd byte designations. The data
are then serialized and passed onto the twisted-pair for transmission.
2.3.4.1.2 Frames Ending on an Odd Byte
Frames that end on an odd byte comply with the IEEE 802.3z standard and are transmitted from the
MAC to the PHY without additional byte assertion. The data are then serialized and passed onto
the twisted-pair for transmission to the receiving device.
shows the direction of data flow between the MAC and PHY. Transmit data traffic is data
Tx
MAC
PHY
TBI
Rx
Tx
MAC
PHY
TBI
Rx
Document #: 249276
Rev. Date: 07/20/01
Revision #: 002
Datasheet