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DM8108

8 port 10/100M Fast Ethernet Switching Controller

Unspecified 

MII Interface

Pin No.

133,117,101,

85,66,50,34,18

Pin Name

TXEN(7:0)

132,116,100,84,

65,49,33,17

22 – 19

TXCLK(7:0)

TXD0(3:0)

38 – 36

54 – 51

70 – 67

TXD1(3:0)

TXD2(3:0)

TXD3(3:0)

89 – 86

TXD4(3:0)

105 –102

TXD5(3:0)

121 –118

137 –134

16 – 13

32 – 29

48 – 45

64 – 61

83 – 80

8

TXD6(3:0)

TXD7(3:0)

RXD0(3:0)

RXD1(3:0)

RXD2(3:0)

RXD3(3:0)

RXD4(3:0)

DM8108

8 port 10/100M Fast Ethernet Switching Controller

I/O

Description

B Transmit Enable: Active high, synchronous to TXCLK; indicate that

the transmission data is valid.

Strap function during reset--

TXEN(7:0): 0 = port 7-0 full duplex

I Transmit Clock: Provides the timing reference for the transfer of

TXEN, TXD signals. It is 25MHz for 100Mbps and 2.5MHz for

10Mbps.

B Transmit data for port 0; synchronous to TXCLK0.

Strap function during reset--

TDX0[0]: 0=80Mhz, 1=66Mhz CLOCK operation

TXD0[1]: 0=enable partition mode, 1=disable partition mode

TXD0[2]: 0=enable expansion port, 1=disable expansion port

TXD0[3]: 0=init only, 1= enable BIST

B Transmit data for port 1; synchronous to TXCLK1.

Strap function during reset --

TXD1[2:0]: test mode

TXD1[3]: 0=enable CRC, 1=disbale CRC

B Transmit data for port 2; synchronous to TXCLK2.

Strap function during reset --

TXD2[2:0]: device # setting

TXD2[3]: DRAM timing 0=fast, 1=slow

B Transmit data for port 3; synchronous to TXCLK3.

Strap function during reset --

TXD3[0]: 0=max. packet size 1536, 1=max. packet size 1518(default)

TXD3[1]: 0=enable back_pressure, 1= disable (default)

TXD3[3:2]: age strap pins

00= 64 sec. 01= 128 sec.

10= 256 sec. 11= disbale

O Transmit data for port 4; synchronous to TXCLK4.

Strap function during reset –

TXD4[0]: 0= port 0 trunking enable 1= port 0 no trunking (default)

TXD4[1]: 0= port 1 trunking enable 1= port 1 no trunking (default)

TXD4[2]: 0= port 2 trunking enable 1= port 2 no trunking (default)

TXD4[3]: 0= port 3 trunking enable 1= port 3 no trunking (default)

O Transmit data for port 5; synchronous to TXCLK5.

Strap function during reset –

TXD5[1:0]: broadcast filtering rate selection

00 = 8k/sec 01 = 16k/sec

10 = 64k/sec 11= disable

O Transmit data for port 6; synchronous to TXCLK6.

O Transmit data for port 7; synchronous to TXCLK7.

I Receive data for port 0; synchronous to RXCLK0.

I Receive data for port 1; synchronous to RXCLK1.

I Receive data for port 2; synchronous to RXCLK2.

I Receive data for port 3; synchronous to RXCLK3.

I Receive data for port 4; synchronous to RXCLK4.

Preliminary

Version: DM8108-DS-P02

November 25, 1999

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