DM8203
2-port switch with MII / RMII Interface
5.4 Clock Interface
Pin No.
Pin Name
I/O
Description
52
53
X1
X2
I
O
Crystal 25MHz In
Crystal 25MHz Out
5.5 Network Interface
Pin No.
Pin Name
I/O
Description
34,35
37,38
41,42
44,45
47
TX1+/-
I/O
Port 1 TP TX
These two pins are the Twisted Pair transmit in MDI
mode or receive in MDIX mode.
Port 1 TP RX
These two pins are the Twisted Pair receive in MDI
mode or transmit in MDIX mode.
Port 0 TP TX
These two pins are the Twisted Pair transmit in MDI
mode or receive in MDIX mode.
Port 0 TP RX
These two pins are the Twisted Pair receive in MDI
mode or transmit in MDIX mode.
Band gap Pin
RX1+/-
TX0+/-
RX0+/-
BGRES
I/O
I/O
I/O
I/O
Connect a 1.4K resistor to BGGND in application.
Band gap Ground
1.8V Voltage control
48
49
50
BGGND
VCNTL
VREF
P
I/O
O
Voltage Reference
Connect a 0.1u capacitor to ground in application.
5.6 Miscellaneous Pins
Pin No.
Pin Name
I/O
Description
30
PWRST#
I
Power on Reset
Low active with minimum 1ms
Serial data management interface clock
60
62
32
59
63
SMI_CK
SMI_DIO
TEST1
I
I/O Serial data management interface in / out
I,PD Tie to VCC3 in application
TEST2
TEST3
I,PD Tie to GND in application
I,PD Tie to VCC3 in application
5.7 Power Pins
Pin No.
Pin Name
I/O
Description
1,13,26,51
11,61
4,8,16,23,31,54,64
39,46
VCC3
VCCI
GND
AVDD3
AVDDI
AGND
P
P
P
P
P
P
Digital 3.3V
Internal 1.8V core power
Digital GND
Analog 3.3V power
Analog 1.8V power
Analog GND
33,40
36,43
Preliminarydatasheet
DM8203-15-DS-P05
October 23, 2008
13
DAVICOM [ DAVICOM SEMICONDUCTOR, INC. ]
