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The configuration file of a XC3S200 FPGA of VM-USB will occupy 512 sectors of flash
memory (512 calls to the xxusb_flashblock_program). The XC3S400 FPGA of VM-USB
will occupy 830 sectors of flash memory.
7
VM_USB SPECIFIC FUNCTIONS
The following functions are specific to the VM_USB. They are built on top of the general
purpose functions described in section 6 and provide users with an easier and more
transparent way of communicating with the controller.
7.1 VME_register_write
The VME_register_write function writes to the internal registers of the VM_USB as
described in section 3.4.
short VME_register_write{
HANDLE hDevice,
USHORT Address,
LONG Data
};
Parameters
hDevice
[in] Handle to the XX-USB device.
Address
[in] VME offset of the register you wish to write to
Data
[in] Data to be written to the specified register
Return Values
On success, the function returns the number of bytes written to VM-USB
Function returns a negative number on a failure
7.2 VME_register_read
The VME_register_read function reads from the internal registers of the VM_USB as
described in section 3.4.
short VME_register_read{
HANDLE hDevice,
USHORT Address,
LONG Data
};
Parameters
hDevice
[in] Handle to the XX-USB device.
Address
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