ST1.3 Series Product Manual, Rev. C 25
4.0 Interface description
These drives use the industry-standard ATA task file interface that supports 16-bit data transfers. It supports
ATA programmed input/output (PIO) modes 0–4; multiword DMA modes 0–2, and Ultra DMA modes 0–4. The
drive also supports the use of the IORDY signal to provide reliable high-speed data transfers.
For detailed information about the 35-way ZIF (IDE interface) connector, please contact your local Seagate
representative.

4.1 Connector interface signals and connector pins

The following table summarizes the signals on the 35-way ZIF (zero insertion force) IDE interface connector.
For a detailed description of these signals, please contact your local Seagate representative.

Table 8: 35-way ZIF (IDE interface) connector signals

Pin
Num
Signal
Name
In, Out
Type
1GNDGround
2D10Data bus bit 10
3D09Data bus bit 09
4D02Data bus bit 02
5D08Data bus bit 08
6D01Data bus bit 01
7ResReserved. Do not connect
8D00Data bus bit 0
9ResReserved. Do not connect
10 A00 Address bus bit 0
11 DMACK- DMA Acknowledge
12 A01 Address bus bit 1
13 DMARQ DMA Request
14 A02 Address bus bit 2
15 IORDY
I/O Ready
DMA ready during Ultra DMA data-in bursts
DMA strobe during Ultra DMA data-out bursts
16 RESET- Hard Reset
17 Res Reserved. Do not connect
18 VCC 3.3V Voltage supply to drive
19 VCC 3.3V Voltage supply to drive
20 IRQ Interrupt request
21 IOWR- I/O Write
Stop during DMA data bursts