Phytec phyCORE-PXA255, Hardware Manual

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Memory Configuration
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PHYTEC Meßtechnik GmbH 2004 L-657e_0
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PLD U6 control register 1 is used for switching and controlling
various supply voltages. The bit PM_5V displays whether the 5 V
voltage is still active or if it was shut off due to a wall adapter output
voltage drop to less than 8 V. If 5V_OFF is set, the 5 V supply can be
shut off independently of the input voltage level. The external CAN
supply voltage can be switched on with the CANPWR bit.
REG ADDR D7-D4 D3 D2 D1 D0
CTRL1 0x0c000002 Res PM_5V CANPWR Res 5V_OFF
RW R/W=0 R R/W R/W=0 R/W
Table 8: PLD U6 Control Register 1
5V_OFF Turns off the 5 V supply (bit set).
CANPWR Turns on the external CAN supply voltage (bit set).
PM_5V Indicates that 5 V supply voltage is active.
The registers for controlling the Development Board’s user LEDs
D11, D12 and D15 are in control register 2 of U6. The register values
are negated by the PLD so that the LEDs can be switched with a high-
active level. The LEDs are located to the right of the phyCORE
module.
REG ADDR D7-D4 D3 D2 D1 D0
CTRL2 0x0c000004 Res Res LEDBAS LEDUSR LEDPWR
RW R/W=0 R/W=0 R/W R/W R/W
Table 9: PLD U6 Control Register 2
LEDPWR Setting this bit will turn on user LED D11.
LEDUSR Setting this bit will turn on user LED D12.
LEDBAS Setting this bit will turn on user LED D15.