RTL8201N
Datasheet
6.4. Clock Interface
Table 4. Clock Interface
Description
25MHz Crystal Output.
Name
Type
Pin No.
CKXTAL2
O
62
This pin provides the 25MHz crystal output. It must be left open when an external
25MHz oscillator drives X1.
CKXTAL1
I
61
25MHz Crystal Input.
This pin provides the 25MHz crystal input. If a 25MHz oscillator is used, connect
CKXTAL1 to the oscillator’s output (see 9.3 Crystal Characteristics, page 32, for
clock source specifications).
6.5. 10Mbps/100Mbps Network Interface
Table 5. 10Mbps/100Mbps Network Interface
Name
MDI+[0]
MDI-[0]
Type
O
O
Pin No.
Description
3
4
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.
RSET
I
1
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 RTL8201N.
MDI+[1]
MDI-[1]
I
I
6
7
Receive Input.
Differential receive input pair shared by 100Base-TX, 100Base-FX, and 10Base-T
modes.
Single-Chip/Port 10/100 Fast Ethernet PHYceiver
With Auto MDIX
7
Rev. 1.2
ETC [ ETC ]
