RTL8201CP
Datasheet
Single-Chip/Port 10/100 Fast Ethernet PHYceiver
5
Track ID: JATR-1076-21 Rev. 1.21
Name
Type
Pin No.
Description
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. The clock rate can be up to 2.5MHz.
MDIO
IO
26
Management Data Input/Output.
This pin provides the bi-directional signal used to transfer management
information.
5.2. SNI (Serial Network Interface) 10Mbps Only
Table 2. SNI (Serial Network Interface) 10Mbps Only
Name
Type
Pin 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.
Generated by PHY.
TXEN
I
2
Transmit Enable.
For MAC to indicate transmit operation.
5.3. Clock Interface
Table 3. Clock Interface
Name
Type
Pin No.
Description
X2
O
47
25MHz Crystal Output.
This pin provides the 25MHz crystal output. It must be left open when an external
25MHz oscillator drives X1.
X1
I
46
25MHz Crystal Input.
This pin provides the 25MHz crystal input. If a 25MHz oscillator is used, connect
X1 to the oscillator’s output (see 8.3 Crystal Characteristics, page 30, for clock
source specifications.
5.4. 10Mbps/100Mbps Network Interface
Table 4. 10Mbps/100Mbps Network Interface
Name
Type
Pin No.
Description
TPTX+
TPTX-
O
O
34
33
Transmit Output.
Differential transmit output pair shared by 100Base-TX, 100Base-FX and
10Base-T modes. When configured as 100Base-TX, output is an MLT-3 encoded
waveform. When configured as 100Base-FX, the output is pseudo-ECL level.
RTSET
I
28
Transmit Bias Resistor Connection.
This pin should be pulled to GND by a 2KΩ (1%) resistor to define driving
current for the transmit DAC. The resistance value may be changed, depending on
experimental results of the RTL8201CP.
TPRX+
TPRX-
I
I
31
30
Receive Input.
Differential receive input pair shared by 100Base-TX, 100Base-FX, and 10Base-T
modes.
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