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5-16 Operating Registers
Register: 0x07 (0x87)
General Purpose (GPREG)
Read/Write
R Reserved [7:2]
GPIO[1:0] General Purpose [1:0]
These bits are programmed through the General Purpose
Pin Control (GPCNTL) register as inputs, outputs, or to
perform special functions. These signals can also be
programmed as live inputs and sensed through a
SCRIPTS register to register Move Instruction. GPIO[1:0]
default as inputs. When configured as inputs, an internal
pull-up is enabled.
LSI Logic SDMS software uses the GPIO 0 pin to toggle
SCSI device LEDs, turning on the LED whenever the
LSI53C810A is connected to the SCSI bus. SDMS
software drives this pin low to turn on the LED, or drives
it high to turn off the LED.
The GPIO[1:0] pins are used in SDMS software to access
serial NVRAM. When used for accessing serial NVRAM,
GPIO 1 is used as a clock with the GPIO 0 pin serving
as data.
7 210
R GPIO[1:0]
x x x x x x00