Samsung S3C2500B User Manual page 53

S3C2500B
Group Pin Name
Ethernet TX_EN_0
Controller0
(18)
TX_ERR_0/
PCOMP_10M
Table 1-1. S3C2500B Signal Descriptions (Continue)
Pin Type Pad Type
1 O
1 O
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.
phob4 Transmit Error/Packet Compression Enable
for 10M. TX_ERR is driven synchronously to
TX_CLK and sampled continuously by the
Physical Layer Entity, PHY. If asserted for one
or more TX_CLK periods, TX_ERR causes the
PHY to emit one or more symbols which are
not part of the valid data, or delimiter set
located somewhere in the frame that is being
transmitted. PCOMP_10M is asserted
immediately after the packet's DA field is
received. PCOMP_10M is used with the
Management Bus of the DP83950 Repeater
Interface Controller (from National
Semiconductor). The MAC can be
programmed to assert PCOMP if there is a
CAM match, or if there is not a match. The
RIC (Repeater Interface Controller) uses this
signal to compress (shorten) the packet
received for management purposes and to
reduce memory usage. (See the DP83950
Data Sheet, published by National
Semiconductor, for details on the RIC
Management Bus.) This pin is controlled by a
special register, with which you can define the
polarity and assertion method (CAM match
active or not match active) of the PCOMP
signal.
PRODUCT OVERVIEW
Description
1-19