Table 3-10. Secondary Ide Interface Pin/Signal Descriptions (J7) - Ampro LittleBoard800 Reference Manual

Chapter 3
Pin # Signal
23 PDIOW*
24 GND
25 PDIOR*
26 GND
27 PDIORDY
28 NC
29 PDACK*
30 GND
31 IRQ14
32 NC
33 PDA1
34 PDIAG
35 PDA0
36 PDA2
37 PDCS1
38 PDCS3
39 NC
40 GND
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.

Table 3-10. Secondary IDE Interface Pin/Signal Descriptions (J7)

Pin # Signal
1 RESET*
2 GND
3 SDD7
4 SDD8
5 SDD6
6 SDD9
7 SDD5
8 SDD10
9 SDD4
LittleBoard 800
Description
Primary I/O Read/Write Strobe – Strobe signal for write functions. Negative
edge enables data from a register or data port of the drive onto the host data bus.
Positive edge latches data at the host.
Ground
Primary I/O Read/Write Strobe – Strobe signal for read functions. Negative
edge enables data from a register or data port of the drive onto the host data bus.
Positive edge latches data at the host.
Ground
Primary I/O Channel Ready – When negated extends the host transfer cycle of
any host register access when the drive is not ready to respond to a data transfer
request. High impedance if asserted.
Not connected
Primary Cable Select – Used to configure IDE drives as device 0 or device 1
using a special cable
Ground
Interrupt Request 14 – Asserted by drive when it has pending interrupt (PIO
transfer of data to or from the drive to the host).
Not connected
Primary ATA Disk Address – Used (0 to 2) to indicate which byte in the ATA
command block or control block is being accessed
UDMA 33/66 Sense – Senses which DMA mode to use for IDE devices.
Primary ATA Disk Address – Used (0 to 2) to indicate which byte in the ATA
command block or control block is being accessed
Primary ATA Disk Address – Used (0 to 2) to indicate which byte in the ATA
command block or control block is being accessed
Primary Slave/Master Chip Select 1 – Used to select the host-accessible
Command Block Register.
Primary Slave/Master Chip Select 3 – Used to select the host-accessible
Command Block Register.
Not connected
Ground
Description
Low active hardware reset (RSTDRV inverted)
Ground
Secondary Disk Data 7 – These signals (0 to 15) provide the disk data signals.
Secondary Disk Data 8 – These signals (0 to 15) provide the disk data signals.
Secondary Disk Data 6 – These signals (0 to 15) provide the disk data signals.
Secondary Disk Data 9 – These signals (0 to 15) provide the disk data signals.
Secondary Disk Data 5 – These signals (0 to 15) provide the disk data signals.
Secondary Disk Data 10 – These signals (0 to 15) provide the disk data signals.
Secondary Disk Data 4 – These signals (0 to 15) provide the disk data signals.
Reference Manual
Hardware
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