GE DS200TBCBG1AAA Channel output module

Address consistency, or address coherency, refers to communications between the XVME-660 and the VMEbus in which both architectures' addresses are the same for each byte. In other words, the XVME-660 and the VMEbus memory images appear the same. Address consistency is desirable for byte-oriented data such as strings or video image data. Consider the example of transferring the string Text to the VMEbus memory using a 32-bit transfer in Figure 4-4.

Maintaining Address 

Consistency Notice that the data byte at each address is identical. To achieve this, the data bytes need to be swapped as they are passed from the PCI bus to the VMEbus. To maintain address consistency, enable the byte-swapping buffers by setting setting bits 6 and 7 of the Flash Paging and Byte Swap register (register 234h) both to 1 (see p. 17). That is, hardware byte swapping is enabled, so tundra data invariation is neutralized.

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