Chapter 3

Hardware

IDE Interface (J12, J17)

The LittleBoard 550 provides two IDE connectors for primary and secondary IDE signals. The EIDE interface logic supports the following features:

Transfer rate up to 100Mbps

Increase reliability using Ultra DMA 33/66/100 transfer protocols

Full scatter-gather capability

Supports ATAPI and DVD compliant devices

PIO IDE transfers as fast as 14Mbps.

Bus master IDE transfers as fast as 100Mbps.

Single Bus Master EIDE

Supports two IDE drives per interface channel (primary or secondary connector) Table 3-9 gives the signals for the IDE 40-pin, 0.100” header.

Table 3-9. Primary IDE Interface Pin/Signal Descriptions (J12)

Pin #

Signal

Description

1

IDERST*

IDE Reset – Low active hardware reset (RSTDRV inverted)

 

 

 

2

GND

Ground

3

PDD7

Primary Disk Data 7 – These signals (D0-D15) carry the Data, Commands, and

 

 

Status between the host and the controller. D0 is the LSB of the even Byte of the

 

 

Word. D8 is the LSB of the Odd Byte of the Word. All Task File operations

 

 

occur in byte mode on the low order bus D0-D7, while all data transfers are 16

 

 

bit using D0-D15 to provide the disk data signals.

4

PDD8

Primary Disk Data 8 – Refer to PDD7 on pin-2 for more information.

5

PDD6

Primary Disk Data 6 – Refer to PDD7on pin-2 for more information.

 

 

 

6

PDD9

Primary Disk Data 9 – Refer to PDD7on pin-2 for more information.

 

 

 

7

PDD5

Primary Disk Data 5 – Refer to PDD7on pin-2 for more information.

8

PDD10

Primary Disk Data 10 – Refer to PDD7 on pin-2 for more information.

 

 

 

9

PDD4

Primary Disk Data 4 – Refer to PDD7 on pin-2 for more information.

 

 

 

10

PDD11

Primary Disk Data 11 – Refer to PDD7 on pin-2 for more information.

11

PDD3

Primary Disk Data 3 – Refer to PDD7 on pin-2 for more information.

 

 

 

12

PDD12

Primary Disk Data 12 – Refer to PDD7 on pin-2 for more information.

 

 

 

13

PDD2

Primary Disk Data 2 – Refer to PDD7 on pin-2 for more information.

14

PDD13

Primary Disk Data 13 – Refer to PDD7 on pin-2 for more information.

 

 

 

15

PDD1

Primary Disk Data 1 – Refer to PDD7 on pin-2 for more information.

 

 

 

16

PDD14

Primary Disk Data 14 – Refer to PDD7 on pin-2 for more information.

17

PDD0

Primary Disk Data 0 – Refer to PDD7 on pin-2 for more information.

 

 

 

18

PDD15

Primary Disk Data 15 – Refer to PDD7 on pin-2 for more information.

 

 

 

19

GND

Ground

20

NC/Key

Not connected / Key pin plug

 

 

 

LittleBoard 550

Reference Manual

35

Page 41
Image 41
Ampro Corporation Littleboard 550 manual IDE Interface J12, J17, Pin # Signal Description