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Chapter 3
IDE Interface (J22)
The ReadyBoard 700 provides one IDE connector (J22) for two IDE devices on the primary IDE
controller and one CompactFlash socket (J23) on the secondary IDE controller.
The EIDE interface logic supports the following features:
Transfer rate up to 100Mbps
Increased 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 66Mbps.
Single Bus Master EIDE
Supports two IDE drives on primary interface and one CompactFlash card on the secondary
Table 3-9 list the signals for the IDE 44-pin, 2mm header.
Table 3-9. Primary IDE Interface Pin/Signal Descriptions (J22)
Pin # Signal
1
RESET*
2
GND
3
PDD7
4
PDD8
5
PDD6
6
PDD9
7
PDD5
8
PDD10
9
PDD4
10
PDD11
11
PDD3
12
PDD12
13
PDD2
14
PDD13
15
PDD1
16
PDD14
17
PDD0
18
PDD15
19
GND
20
NC-Key
21
PDDREQ
ReadyBoard 700
Description
Reset – Low active hardware reset (RSTDRV inverted)
Digital Ground
Primary Disk Data 7 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 8 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 6 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 9 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 5 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 10 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 4 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 11 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 3 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 12 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 2 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 13 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 1 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 14 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 0 – These signals (0 to 15) provide the disk data signals
Primary Disk Data 15 – These signals (0 to 15) provide the disk data signals
Digital Ground
Not Connected - Key pin plug
Primary Device DMA Channel Request – Used for DMA transfers between
host and drive (direction of transfer controlled by DIOR* and DIOW*). Also
used in an asynchronous mode with DMACK*. Drive asserts IDRQ0 when
ready to transfer or receive data.
Reference Manual
Hardware
33
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