Seagate DiamondMax 21 Manual download pdf (Page 35)

DiamondMax 21 PATA Product Manual, Rev. B 29

4.0 ATA interface

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 0–5. 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 about

the ATA interface, refer to the draft of AT Attachment with Packet Interface Extension (ATA/ATAPI-7), NCITS

T13 1410D, subsequently referred to as the Draft ATA-7 Standard.

4.1 ATA interface signals and connector pins

Figure 7 on page 29 summarizes the signals on the ATA interface connector that the drive supports. For a

detailed description of these signals, refer to the Draft ATA-7 Standard.

Figure 7 I/O pins and supported ATA signals

Reset

–

Ground

DD7

DD8

DD6

DD9

DD5

DD10

DD4

DD11

DD3

DD12

DD2

DD13

DD1

DD14

DD0

DD15

Ground

(removed)

DMARQ

Ground

DIOW–

STOP

Ground

DIOR

–

HDMARDY

–

HSTROBE

Ground

IORDY

DDMARDY–

DSTROBE

CSEL

DMACK

–

Ground

INTRQ

IOCS16

–

DA1

PDIAG

–

CBLID–

DA0

DA2

CS0

–

CS1

–

DASP

–

Ground

Hardware Reset

Ground

Host Data Bus Bit 7

Host Data Bus Bit 8

Host Data Bus Bit 6

Host Data Bus Bit 9

Host Data Bus Bit 5

Host Data Bus Bit 10

Host Data Bus Bit 4

Host Data Bus Bit 11

Host Data Bus Bit 3

Host Data Bus Bit 12

Host Data Bus Bit 2

Host Data Bus Bit 13

Host Data Bus Bit 1

Host Data Bus Bit 14

Host Data Bus Bit 0

Device Data (15:0)

Ground

(No Pin)

DMA Request

Ground

Device I/O Write:

Stop Ultra DMA Burst

Ground

Device I/O Read:

Host Ultra DMA Ready:

Host Ultra DMA Data Strobe

Ground

I/O Channel Ready

Device Ultra DMA Ready

Device Ulta DMA Data Strobe

Cable Select

DMA Acknowledge

Ground

Device Interrupt

Reserved

Host Address Bus Bit 1

Passed Diagnostics

Cable Assembly Type Identifier

Device Address (2:0)

Chip Select (1:0)

Drive Active/Slave Present

Ground

Host pin # and signal description

Drive pin #

Signal name

Pins 28, 34 and 39 are used for master-slave communication (details shown below).

Host

Drive 0 (master)Drive 1 (slave)

CSEL

PDIAG

–

DASP–

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 49 50

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Seagate DiamondMax 21 Manual Page 35

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