DM8108
8 port 10/100M Fast Ethernet Switching Controller
Preliminary
27
Version: DM8108-DS-P02
November 25, 1999
Strap Pins during Reset
The following table shows the strap pins during RESET.
Symbol
Description
LEDSTB
Strap pin during reset:
0= force link, 1= link detection through serial MII (default)
LEDD
Strap pin for TXENCLK frequency of expansion port:
0=fast, 1= slow (default)
TXD0[3:0]
TXD0[0]: Strap pin for the operating frequency
0=88Mhz; 1= 66Mhz (default)
TXD0[1]: Strap pin to enable partition mode
0=enable; 1=disable (default)
TXD0[2]: Strap pin to enable expansion port
0=enable; 1=disable (default)
TXD0[3]: Strap pin to enable BIST
0=init only; 1=enable (default)
TXD1[3:0]
TXD1[2:0]: test function
TXD1[3]: disable CRC checking
0= disable; 1=enable (default)
TXD2[3:0]
Strap pins during reset:
TXD2[2:0] = device # setting
TXD2[3] strapped for DRAM timing: 0=fast, 1= normal (default)
TXD3[3:0]
Strap pin during reset:
TXD3[0] Max packet size selection:
0 = 1536 bytes, 1=1518 bytes (default)
TXD3[1] Back pressure and flow control enable:
0 = enable, 1 = disable (default)
TXD3[3:2] aging timing selection:
00 – 64sec. 01 –12 8 sec.
10 – 256 sec. 11 – disable (default)
TXD4[3:0]
Strap pin during reset:
TXD4[0] port 0 trunking selection: 0 = enable, 1=disable (default)
TXD4[1] port 1 trunking selection: 0 = enable, 1=disable (default)
TXD4[2] port 2 trunking selection: 0 = enable, 1=disable (default)
TXD4[3] port 3 trunking selection: 0 = enable, 1=disable (default)
TXD5[1:0]
Strap pin during reset:
TXD5[1:0] broadcast filtering rate selection:
00 =
8k packets/sec.
01 = 16k packets/sec.
10 = 64k packets/sec.
11 = disable (default)
TXEN(7:0)
Strap pins during reset for ports’ operating mode:
0= full duplex, 1=half duplex (default)
MA9
Strap pin during reset:
0= limit4 enabled, 1= disabled (default)
MA8
Strap pin during reset for memory size selection:
0= 2MB, 1= 1MB (default)
MA(7:0)
Strap pins during reset:
MA7-0: Auto-negotiation enable for port0:
0= enabled (default), 1 = disabled
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