RTL8201(L)
2002-01-18 Rev.1.04
5
5. Pin Description
5.1 100 Mbps MII & PCS Interface
Symbol Type Pin(s) No. Description
TXC O 7 Transmit Clock: This pin provides a continuous clock as a timing reference
for TXD[3:0] and TXEN.
TXEN I 2 Transmit Enable: The input signal indicates the presence of a valid nibble
data on TXD[3:0].
TXD[3:0] I 3, 4, 5, 6 Transmit Data: MAC will source TXD[0..3] synchronous with TXC when
TXEN is asserted.
RXC O 16 Receive Clock: This pin provides a continuous clock reference for RXDV
and RXD[0..3] signals. RXC is 25MHz in the 100Mbps mode and 2.5Mhz in
the 10Mbps mode.
COL O 1 Collision Detected: COL is asserted high when a collision is detected on the media.
CRS I/O 23 Carrier Sense: This pin’s signal is asserted high if the media is not in IDEL state.
RXDV O 22 Receive Data Valid: This pin’s signal is asserted high when received data is
present on the RXD[3:0] lines; the signal is deasserted at the end of the
packet. The signal is valid on the rising of the RXC.
RXD[3:0] O 18, 19, 20, 21 Receive Data: These are the four parallel receive data lines aligned on the
nibble boundaries driven synchronously to the RXC for reception by the
external physical unit (PHY).
RXER O 24 Receive error: if any 5B decode error occurred such as invalid J/K, T/R,
invalid symbol, this pin will go high
MDC I 25 Management Data Clock: This pin provides a clock synchronous to MDIO,
which may be asynchronous to the transmit TXC and receive RXC clocks.
MDIO I/O 26 Management Data Input/Output: This pin provides the bi-directional
signal used to transfer management information.
5.2 Serial Network Interface (SNI)
10Mbps only
Symbol Type Pin(s) No. Description
COL O 1
Collision Detect
RXD0 O 21
Received Serial Data
CRS O 23
Carrier Sense
RXC O 16 Receive Clock: Resolved from received data
TXD0 I 6
Transmit Serial Data
TXC O 7 Transmit Clock: Generate by PHY
TXEN I 2 Transmit Enable: For MAC to indicate transmit operation
5.3 Clock Interface
Symbol Type Pin(s) No. Description
X2 O 47 25Mhz Crystal Output: This pin provides the 25MHz crystal output.
X1 I 46 25Mhz Crystal Input: This pin provides the 25MHz crystal input.
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