Ata Interface; Ata Interface Signals And Connector Pins; At Bus Signal Levels - Seagate ST32122A - Medalist 2.1 GB Hard Drive Product Manual

Medalist 4342, 3232, 2122, 1722 and 1012 Product Manual

3.0 ATA interface

These drives use the industry-standard ATA task file interface. It supports
16-bit data transfers. It supports ATA programmed input/output (PIO)
modes 0, 1, 2, 3 and 4; multiword DMA modes 0, 1 and 2; and Ultra DMA
modes 0, 1 and 2. The drive also supports the use of the IORDY signal
to provide reliable high-speed data transfers.
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 draft of AT Attachment with Packet Interface Extension (ATA/ATAPI-
4), NCITS T13 1153D , subsequently referred to as the Draft ATA-4
Standard .

3.1 ATA interface signals and connector pins

Figure 5 on page 22 summarizes the signals on the ATA interface
connector that the drive supports. For a detailed description of these
signals, refer to the Draft ATA-4 Standard.

3.1.1 AT bus signal levels

Signals that the drive receives must have the following characteristics at
the drive connector:
Logic low 0.0V to 0.7V
Logic high 2.0V to 5.25V
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