IDT 89HPES48T12G2, User Manual

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IDT Switch Configuration and Status Registers
PES48T12G2 User Manual 16 - 14 April 5, 2013
GPIOCFG0 - General Purpose I/O Configuration 0 (0x0AA8)
GPIOCFG1 - General Purpose I/O Configuration 1 (0x0AAC)
GPIOD0 - General Purpose I/O Data 0 (0x0AB0)
Bit
Field
Field
Name
Type
Default
Value
Description
31:0 GPIOCFG RW 0x0
SWSticky
GPIO Configuration. Each bit in this field controls the correspond-
ing GPIO pin. When a bit is configured as a general purpose I/O
pin and the corresponding bit in this field is set, then the pin is con-
figured as a GPIO output. When a bit is configured as a general
purpose I/O pin and the corresponding bit in this field is cleared,
then the pin is configured as an input. When the pin is configured
as an alternate function, the behavior of the pin is defined by the
alternate function.
Bit x in this field corresponds to GPIO pin x.
Bit
Field
Field
Name
Type
Default
Value
Description
21:0 GPIOCFG RW 0x0
SWSticky
GPIO Configuration. Each bit in this field controls the correspond-
ing GPIO pin. When a bit is configured as a general purpose I/O
pin and the corresponding bit in this field is set, then the pin is con-
figured as a GPIO output. When a bit is configured as a general
purpose I/O pin and the corresponding bit in this field is cleared,
then the pin is configured as an input. When the pin is configured
as an alternate function, the behavior of the pin is defined by the
alternate function.
Bit x in this field corresponds to GPIO pin (x+32).
31:22 Reserved RO 0x0 Reserved field.
Bit
Field
Field
Name
Type
Default
Value
Description
31:0 GPIOD RW HWINIT
SWSticky
GPIO Data. Each bit in this field controls the corresponding GPIO
pin. Reading this field returns the current value of each GPIO pin
regardless of GPIO pin mode (i.e., alternate function or GPIO pin).
Writing a value to this field causes the corresponding pins which
are configured as GPIO outputs to change state to the value writ-
ten.
Bit x in this field corresponds to GPIO pin x.