PLX Technology PEX 8647-AA RDK, Справочник по аппаратуре

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3. On-Board Connectors, Switches, and Jumpers
3.1 DIP Switches
The PEX 8647-AA RDK contains one user controllable DIP switch (SW2) for selecting the lower three bits of I
2
C
address. Each DIP switch position can be either ON (logic ‘LOW) or OFF (logic ‘HIGH). The white squares
in
Figure 3-1 indicate which way the switch is connected. The default settings of the I
2
C address are I2C_ADD[2:]
= 000 or “ON, ON, ON”.
3.1.1
I
2
C
Address Selection (SW2)
1
ON
2
3
4
Figure 3-1. Switch SW2 Default Settings
Table 3-1. Switch SW2 Description
SW2 Functional Description Switch Position Settings
PEX 8647 I
2
C Address bits[2:0].
Default setting is 000b.
1: I2C_ADDR[0]
2: I2C_ADDR[1]
3: I2C_ADDR[2]
4: RSV_17#
I
2
C_ADD[2:0] PEX 8647 I
2
C Slave Address
000b 68h
001b 69h
010b 6Ah
011b 6Bh
100b 6Ch
101b 6Dh
110b 6Eh
111b 6Fh
RSV_17#: PLX use only and should be set to “HIGH”
3.2 Push-Button Switches
3.2.1 Manual Reset# (S1)
The PEX 8647-AA RDK provides a manual switch (S1) for PERST# capability. Note that manual PERST# will
only apply warm reset to the PEX 8647 as well as SLOT 1 and SLOT 2.
PEX 8647-AA RDK Hardware Reference Manual, Version 1.2
12 Copyright © 2008 by PLX Technology, Inc. All rights reserved