Ata Interface; Ata Interface Signals And Connector Pins; At Bus Signal Levels - Seagate MARATHON 810 Product Manual

Ata interface drive

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Marathon 810 (ST9816AG) Product Manual, August 1995

3.0 ATA interface

The ST9816AG uses the industry-standard ATA interface. It supports

both 8-bit and 16-bit data transfers. It supports ATA programmed in-

put/output (PIO) modes 0, 1, 2, 3 and 4, ATA single-word DMA modes

0, 1 and 2, and ATA multiword DMA modes 0, 1 and 2. The drive also

supports the use of the IORDY signal to provide reliable high-speed data

transfers.

The drive can differentiate between a hard reset and a soft reset while

in Sleep mode. You can use a daisy-chain cable to connect two drives

to a single AT host bus. For detailed information regarding the ATA

interface, refer to the Proposed Working Draft of the ATA-2 Draft Pro-

posed American National Standard , document X3T9.2/948D (sub-

sequently referred to as the Draft Proposed ATA-2 Standard).

Figure 5 on page 22 summarizes the signals on the ATA interface

connector that are supported by the ST9816AG. For a detailed descrip-

tion of these signals, refer to the Draft Proposed ATA-2 Standard.

Signals that the drive sends have the following output characteristics at

the drive connector:

Logic Low

0.0V to 0.4V

Logic High

2.5V to 5.25V

Signals that the drive receives must have the following input charac-

teristics, measured at the drive connector:

Logic Low

0.0V to 0.8V

Logic High

2.0V to 5.25V

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