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 T
ransmit 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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