Ciprico Rimfire 3880 Manuel D’Utilisation
21020285 D
User’s Guide
Appendix E Design Differences
Page E - 6
How to Maximize Performance
Uniquely Identify the RF3880
In order to differentiate the RF3880 from the RF3560/70 and RF3870, a new
word field was added to the Board Information Data Structure returned from
the Board Information command. This new word is the Adapter Base Model #
(number) word.
word field was added to the Board Information Data Structure returned from
the Board Information command. This new word is the Adapter Base Model #
(number) word.
Odd-byte Addressing
VME addresses for transfers must be word-aligned.
How to
Maximize
Performance
Maximize
Performance
In order to take full advantage of the RF3880 design, you should do the
following:
following:
•
Align VME D64 data buffers to 2K address boundaries, and specify a
Bus Throttle of 2048 bytes per burst. Any other alignment will reduce the
maximum Burst size to 256 bytes per burst.
Bus Throttle of 2048 bytes per burst. Any other alignment will reduce the
maximum Burst size to 256 bytes per burst.
•
Align all data buffers to double-longword address boundaries. Any other
alignment will cause multiple data transfer cycles on the VME bus. The
first transfer will move enough data to align the address to a double-
longword. The next transfer will move the data according to the Bus
Throttle setting.
alignment will cause multiple data transfer cycles on the VME bus. The
first transfer will move enough data to align the address to a double-
longword. The next transfer will move the data according to the Bus
Throttle setting.