3.5” Bulldog User Guide
April 10, 2006
page 9 of 13
3.3 IDE INTERFACE
The AT3515 uses a unitized signal and power connector. Maximum cable length is 18
inches. Recommended cable length is 12 inches or less, especially if advanced PIO or
DMA transfer modes are used.
3.3.1 IDE CONNECTOR PINOUT
The signal to pin assignment for the 40-pin IDE interface connector is listed in the
following table.
PIN SIGNAL PIN SIGNAL
1 RESET-
2 GND
3 DATA7
4 DATA8
5 DATA6
6 DATA9
7 DATA5
8 DATA10
9 DATA4
10 DATA11
11 DATA3
12 DATA12
13 DATA2
14 DATA13
15 DATA1
16 DATA14
17 DATA0
18 DATA15
19 GND
20 KEY
(NO
PIN)
21 DMARQ
22 GND
23 IOW-
24 GND
25 IOR-
26 GND
27 IOCHRDY
28 CSEL
29 DMACK-
30 GND
31 IRQ
32 IOCS16-
33 ADDR1
34 PDIAG-
35 ADDR0
36 ADDR2
37 CS0-
38 CS1-
39 DASP-
40 GND
4. OPERATION
4.1 ECC
The IDE controller utilizes a 72-bit Reed-Solomon Error Detection Code (EDC) and Error
Correction Code (ECC), which provides the following error immunity for each 512-byte
block of data:
1. Corrects up to three random 12-bit symbol errors.
2. Corrects single bursts up to 25 bits.