The xFIT register class is used for reading and writing the FIFO Test registers within VXI cards.
The class is similar to the xDig class except that there is no INITIALISE function; bit subfields of hardware registers is not supported and the register can only be accessed if VXI.GO is not set.

The class accepts values in decimal or hex format.

All address variables are VME addresses and are thus expressed in units of bytes (8 bits).

Attributes :-

-s    VXI slot number

specifies the slot number (1-12) within the VXI crate. Manditory - no default value.

-c    channel number

specifies the hardware channel within the VXI card.
Normally channel 0 is used for the configuration and common registers positioned at the base of the card address space and channels 1 => n are used for the channel specific registers.

-o    offset

specifies the address offset of the hardware register relative to the base of the current channel within the VXI card.

-w    width of VME access. Options are 8; 16; 32.

specifies the data width required for accesses to the VXI hardware register.

-p    access permission (rw, ro, wo)

specifies the data access modes permitted to the VXI hardware register. Options are ro (read only); wo (write only); rw (read-write).

-f    data format

specifies the data format to be used by READ operations. Data can be return in decimal (d) or hexadecimal (x). The default is hexadecimal.

The absolute VME address of a register (relative to the card base address allocated by the Resource Manager) is given by (channel number * 256) + (register offset).