PEX 8509RDK Hardware Reference Manual v1.1
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© 2007, PLX Technology, Inc. All rights reserved.
Table 3-2. Switch SW2 Description
SW2 Functional Description
Switch Position Settings
PEX 8509 I2C Address bits[2:0].
Default setting is 111b.
1: I2C_ADDR[0]
2: I2C_ADDR[1]
3: I2C_ADDR[2]
Bus Encodings [1:0]
PEX 8509 I2C Slave Address
000b 38h
001b 39h
010b 3Ah
011b 3Bh
100b 3Ch
101b 3Dh
110b 3Eh
111b 3Fh
3.1.3
Port Configuration (SW3)
Figure 3-3. Switch SW3 Default Settings
Table 3-3. Switch SW3 Description
SW3 Functional Description
Switch Position Settings
STRAP_PORTCFG[3:0]
Selects PEX 8509 Port Configuration
Default Setting is 11b.
NOTE: When the RDK Plugs into the RDK
Port Expansion Kit, SW3 setting should
be 00b.
1: STRAP_STN_PORTCFG[0]
2: STRAP_STN_PORTCFG[1]
Bus Encodings [1:0]
Port Configuration
00b x1,x1,x1,x1,x1,x1,x1,x1
01b x2,x1,x1,x1,x1,x1,x1
10b x2,x2,x1,x1,x1,x1
11b x4,x1,x1,x1,x1
SW3
ON
PORTCFG0
PORTCFG1
LOW
1
1
2
ON
2
HIGH
