NAME

vme_rmw - Performs a VMEbus read/modify/write cycle.

SYNOPSIS

OPTIONS

-a addr_mod

VMEbus address modifer. Possible values are:

- VME_A16S - Short supervisory access.
- VME_A16U - Short nonprivileged access
- VME_A24SB - Standard supervisory block transfer
- VME_A24SD - Standard supervisory data access
- VME_A24SP - Standard supervisory program access
- VME_A24UB - Standard nonprivileged block transfer
- VME_A24UD - Standard nonprivileged data access
- VME_A24UP - Standard nonprivileged program access
- VME_A32SB - Extended supervisory block transfer
- VME_A32SD - Extended supervisory data access
- VME_A32SP - Extended supervisory program access
- VME_A32UB - Extended nonprivileged block transfer
- VME_A32UD - Extended nonprivileged data access
- VME_A32UP - Extended nonprivileged program access

-A vme_addr

VMEbus address to begin transfer.

-d dwidth

Transfer data width. Possible values are:

- VME_D8
- VME_D16
- VME_D32

-f flags

Flags to pass to the vme_master_window_create function. The following constants may be OR'ed together:

- VME_CTL_PWEN - Enable posted writes.
- VME_CTL_EXCLUSIVE - This window will not be shared.

One of the following values for max data width can be used. If a value is not specifed, a default max data width is selected.

- VME_CTL_MAX_DW_64
- VME_CTL_MAX_DW_32
- VME_CTL_MAX_DW_16
- VME_CTL_MAX_DW_8
- VME_CTL_PCI_IO_SPACE - Open the window to PCI I/O space.

PARAMETERS

mask

Mask of bits to compare.

cmp

Bit value against which the read value is compared.

swap

Bit values to write to bits that compare true.

DESCRIPTION

Performs a VMEbus read/modify/write cycle. The cycle is performed by reading a value from the VMEbus and bitwise-comparing masked values (true/false) with the contents of cmp. All true bits are swapped with the contents of the swap register.