Ethernet Physical Transceiver (EPHY)
MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
19-26
Freescale Semiconductor
Figure 19-20. Auto-Negotiation
19.4.3
10BASE-T
The 10BASE-T interface implements the physical layer specification for a 10 Mbps over two pairs of
twisted-pair cables. The specifications are given in clause 14 of the IEEE 802.3 standard.
In 10BASE-T mode, Manchester encoding is used. When transmitting, nibbles from the MII are converted
to a serial bit stream and then Manchester encoded. When receiving, the Manchester encoded bit stream
is decoded and converted to nibbles for presentation to the MII.
A 2.5 MHz internal clock is used for nibble wide transactions. A 10 MHz internal clock is used for serial
transactions.
complete_ack
transmit_ability
transmit_ack
transmit_disable
flp_link_good
ack_finished
flp_receive_idle
match_wo_ack
match_w_ack
receive_done
flp_link_good
Transmit
Arbitration
Receive
MR_ADV_ABILITY[3:0]
MR_ADV_ABILITY[15:0]
MR_LP_ADV_ABILITY[3:0]
MR_LP_ADV_ABILITY[15:0]
NLP Receive Link
Integrity Test
TX_LINK_CONTROL[1:0]
1
2
1
2
LP_LINK_STATUS[1:0]
LP_LINK_CONTROL[1:0]
TX_LINK_STATUS[1:0]
LINKPULSE
DO
RD
LINK_TEST_RECEIVE
TD_AUTONEG
CLK
POWER_ON
MR_MAIN_RESET
MR_AUTONEG_ENABLE
MR_AUTONEG_COMPLETE
MR_PARALLEL_DETECTION_FAULT
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:MCF52234CVM60,
MCF52235CVM60
