Samsung S3C2501X User Manual page 46

S3C2501X
Group Pin Name
Ethernet TXD1[3:0]/
Controller1 TXD_10M/
(18) LOOP_10M
TX_EN_1
Table 1-1. S3C2501X Signal Descriptions (Continue)
Pin Type Pad Type
4 O
1 O
phob12 Transmit Data/Transmit Data for 10M.
Transmit data is aligned on nibble boundaries.
TXD[0] corresponds to the first bit to be
transmitted on the physical medium, which is
the LSB of the first byte and the fifth bit of that
byte during the next clock. TXD_10M is
shared with TXD[0] and is a data line for
transmitting to the 10-Mbit/s PHY. LOOP_10M
is shared with TXD[1] and is driven by the
loop-back bit in the control register.
phob4 Transmit Enable/Transmit Enable for 10M.
TX_EN provides precise framing for the data
carried on TXD[3:0]. This pin is active during
the clock periods in which TXD[3:0] contains
valid data to be transmitted from the preamble
stage through CRC. When the controller is
ready to transfer data, it asserts TXEN_10M.
PRODUCT OVERVIEW
Description
1-21