DSP2022-A ATA/IDE Disk Drive Installation Guide
3
Note Pin Status of the Vendor-Specific Field
The vendor-specific pin field consists of pins A1–A4 and is
used for manufacturing testing purposes. As indicated in
Table 1, these vendor-specific pins should always be left
open.
Table 1
Vendor-Specific Pin Options
Pin
Function
Status
A1
Ground MFG test strap
Leave open
A2
Test UART receive data
Leave open
A3
+12 V for controller ROM
Leave open
A4
Test UART transmit data
Leave open
Note the Use of the ATA Signal Pins
The 44 ATA signals pins carry the ATA signals, power, and
grounds paths for the drive circuitry. Table 2 provides a list
of the signal names. For a full explanation of all the ATA
signal functions, refer to the ANSI ATA Specification.
