Figure 5. I/O Pins And Supported Ata Signals - Seagate ST32122A - Medalist 2.1 GB Hard Drive Product Manual

22 Medalist 4342, 3232, 2122, 1722 and 1012 Product Manual
Drive pin #
Signal name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
(removed)
20
21 DMARQ
22
23
24
25
HDMARDY:
HSTROBE
26
27
DDMARDY-:
DSTROBE
28
DMACK –
29
30
31
IOCS16 –
32
33
PDIAG –
34
35
36
37
38
39
40
Pins 28, 34 and 39 are used for master-slave communication (details shown below).
Drive 1 (slave) Drive 0 (master)
28
34
39

Figure 5. I/O pins and supported ATA signals

Host pin # and signal description
Reset –
1 Hardware Reset
Ground 2 Ground
DD7 3 Host Data Bus Bit 7
DD8 4 Host Data Bus Bit 8
DD6 5 Host Data Bus Bit 6
DD9 6 Host Data Bus Bit 9
DD5 7 Host Data Bus Bit 5
DD10 8 Host Data Bus Bit 10
DD4 9 Host Data Bus Bit 4
DD11 10 Host Data Bus Bit 11
DD3 11 Host Data Bus Bit 3
DD12 12 Host Data Bus Bit 12
DD2 13 Host Data Bus Bit 2
DD13 14 Host Data Bus Bit 13
DD1 15 Host Data Bus Bit 1
DD14 16 Host Data Bus Bit 14
DD0 17 Host Data Bus Bit 0
DD15 18 Device Data (15:0)
Ground 19 Ground
(No Pin)
20
21 DMA Request
Ground 22 Ground
DIOW-: 23 Device I/O Write:
STOP Stop Ultra DMA Burst
Ground 24 Ground
DIOR-:
25 Device I/O Read:
Host Ultra DMA Ready:
Host Ultra DMA Data Strobe
Ground 26 Ground
IORDY: 27 I/O Channel Ready
Device Ultra DMA Ready
Device Ulta DMA Data Strobe
CSEL 28 Cable Select
29 DMA Acknowledge
Ground 30 Ground
INTRQ 31 Device Interrupt
32 Host 16 Bit I/O
DA1 33 Host Address Bus Bit 1
34 Passed Diagnostics
DA0 35 Device Address (2:0)
DA2 36 Device Address (2:0)
CS0 –
37 Chip Select (1:0)
CS1 –
38 Chip Select (1:0)
DASP –
39 Drive Active / Slave Present
Ground 40 Ground
28 CSEL
PDIAG –
34
DASP–
39
Host
28
34
39