3.10 Power Supply
3.11 Configuring the RDK board
All electronic devices on the RDK, except U7,
the programmable RS232 transceiver, are 3.3V
devices. The RDK uses an LDO regulator to
convert the 5 V
DC
to 3.3 V
DC
for those devices.
As long as the output current from the voltage
converter remains less than 2A, the RDK board
can work without any problem.
The RDK hardware’s Processor/Local Bus is
pre-configured for non-multiplexed data and
address generic (C mode) Processor/Local Bus
operation. It can be reconfigured for either
multiplexed data and address Processor/Local
Bus operation generic (J mode) or Motorola
PowerQUICC (M Mode) Processor/Local Bus
operation. (Note. Even though the PCI
9054RDK-LITE can be configured for M Mode
operation, M Mode designers should use the
PCI 9054RDK-860 or CompactPCI 9054RDK-
860 instead.)
Several resistors configure the RDK hardware’s
Processor/Local Bus for C, J, or M Mode. The
specific resistors to install and remove for each
mode are detailed in Table 3-5.
Table 3-5. PCI 9054 Mode Setting
Install R3, R4, R26, R27, R28, R29, R30, R42, R44, and R46.
C Mode
Do not install R1, R2, R22, R23, R24, R25, R31, R43, R45 and R47
LA29 resistor RN12[1,8] must be a pull-up (default configuration).
(Default)
Install R1, R4, R26, R27, R28, R29, R30, R43, R45 and R47
J Mode
Do not install R2, R3, R22, R23, R24, R25, R31, R42, R44 and R46
ALE resistor RN12[1,8] must be a pull-down.
Install R1, R2, R22, R23, R24, R25 and R31.
M Mode
Do not install R3, R4, R26, R27, R28, R29, or R30.
The PCI 9054RDK-LITE is shipped
configured for C-Mode Local Bus operation.
As a result, pin 56, LA29, is pulled up
(RN12[1,8]). If the RDK is re-configured for
J-Mode Local Bus operation (see Table 3-5
above), pin 56 changes from LA29 to ALE
and must be pulled down.
To convert RN12[1,8] from a pull-up to a
pull-down, cut the short trace leading from
pin 8, to disconnect the resistor from 3.3V
(Vdd). Then connect pin 8 to GND by
soldering a wire to pin 8, with the other end
of the wire soldered to the top of C3 (or
C11), approximately 1 cm distant from pin 8.
PCI 9054RDK-LITE Hardware Reference Manual v1.3
© 2006 PLX Technology, Inc. All rights reserved.
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