Parallel ATA (PATA), originally AT Attachment, is an interface standard for the connection of storage devices such as hard disks, floppy drives, and optical disc drives in computers. The standard is maintained by X3/INCITS committee.[1] It uses the underlying AT Attachment (ATA) and AT Attachment Packet Interface (ATAPI) standards.The Parallel ATA standard is the result of a long history of incremental technical development, which began with the original AT Attachment interface, developed for use in early PC AT equipment. The ATA interface itself evolved in several stages fromWestern Digital's original Integrated Drive Electronics (IDE) interface.
DATA PINs
| Pin 1 | Reset | ||
|---|---|---|---|
| Pin 2 | Ground | ||
| Pin 3 | Data 7 | ||
| Pin 4 | Data 8 | ||
| Pin 5 | Data 6 | ||
| Pin 6 | Data 9 | ||
| Pin 7 | Data 5 | ||
| Pin 8 | Data 10 | ||
| Pin 9 | Data 4 | ||
| Pin 10 | Data 11 | ||
| Pin 11 | Data 3 | ||
| Pin 12 | Data 12 | ||
| Pin 13 | Data 2 | ||
| Pin 14 | Data 13 | ||
| Pin 15 | Data 1 | ||
| Pin 16 | Data 14 | ||
| Pin 17 | Data 0 | ||
| Pin 18 | Data 15 | ||
| Pin 19 | Ground | ||
| Pin 20 | Key or VCC_in | ||
| Pin 21 | DDRQ | ||
| Pin 22 | Ground | ||
| Pin 23 | I/O write | ||
| Pin 24 | Ground | ||
| Pin 25 | I/O read | ||
| Pin 26 | Ground | ||
| Pin 27 | IOCHRDY | ||
| Pin 28 | Cable select | ||
| Pin 29 | DDACK | ||
| Pin 30 | Ground | ||
| Pin 31 | IRQ | ||
| Pin 32 | No connect | ||
| Pin 33 | Addr 1 | ||
| Pin 34 | GPIO_DMA66_Detect | ||
| Pin 35 | Addr 0 | ||
| Pin 36 | Addr 2 | ||
| Pin 37 | Chip select 1P | ||
| Pin 38 | Chip select 3P | ||
| Pin 39 | Activity | ||
| Pin 40 | Ground |
other specification
| Hot pluggable | No | ||
|---|---|---|---|
| External | No | ||
| Cable | 40 or 80 wires ribbon cable | ||
| Pins | 40 | ||
| Width | 16 bits | ||
| Bitrate | 16 MB/s originally later 33, 66, 100 and 133 MB/s | ||
| Max. devices | 2 (master/slave) | ||
| Protocol | Parallel | ||
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