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by storing the suitable mask word in Number Extract Mask Register. Then, in the command
stack, one must identify a command that is to retrieve the desired number, by setting bit 18
(value 0x40000) in its Mode Register. With this done, the subsequent block transfer will use
the retrieved number as the number of transfers, overriding any data stored in bits 24-31 of
the Mode Word.
The number extract mask word must have contiguous set of bits set to identify the position of
the desired number within the data word retrieved. Valid numbers are 0 – 256.
4.5.17 Using XXUSBWin Application to Handle Stacks
The MS Windows application XXUSBWin allows one to create, save, and read, as well as to
upload the VME command stack list in an easy and convenient way.
Further, it is possible to create the VME command stack with either a text editor or user
program. All required programming details are given in chapter 4.5.
The following example shows the VME command stack (as saved to file) for a VME 32-bit
write to address 0x78000020 / data 0xAAAAFFFF as well as a VME 16-bit read from
address 0x78000120, both with AM=0x09. Please note that the VME command stack is
based on 32-bit words but arrange in 16-bit lines, i.e. 2 consequent lines belong to one 32-bit
word. Explanations are added in blue color:
VM-USB Command Stack Generated on 8/29/2005 at 5:56:57 PM
WIENER, Plein & Baus GmbH
31
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