Process and apparatus for configuring the direct memory access transfer mode of a motherboard or host computer
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United States of America Patent
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Feb 18, 2003
Grant Date -
N/A
app pub date -
Mar 20, 2000
filing date -
Nov 5, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process and apparatus for configuring a motherboard or host computer (3) to operate direct memory transfer mode, such as Ultra-DMA or Ultra-ATA, in accordance with the particular type of cable--IDE or 40-conductor cable being used. The 80-conductor cable has one particular conductor which is cut between the host connector and the device connectors and which corresponds to a terminal which the device releases when it receives a reset pulse. On the host side the terminal is internally connected to ground. A sampling of the logical state carried by the particular terminal is performed during a reset pulse transmitted to the device(s), in order to determine the type of cable, and configure the Ultra-DMA mode accordingly. The invention is well adapted for the 80-conductor detection by testing pin 34 carrying the PDIAG# signal.
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