Compactflash Socket (J8); Table 3-11. Compactflash Interface Pin/Signal Descriptions (J8) - Ampro LittleBoard800 Reference Manual

Chapter 3
Pin # Signal
38 SDCS3
39 NC
40 GND
Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.

CompactFlash Socket (J8)

The board contains a Type II PC card socket, which allows for the insertion of a CompactFlash (CF)
Card. The CompactFlash Card acts as a standard IDE Drive and is connected to the secondary IDE bus.
If a CompactFlash card is installed, only one additional IDE drive may be added to the secondary bus.
Jumpers are used to select the Master/Slave mode and the voltage selection (+5V or +3.3V). Refer to
Table 2-5, Jumper Settings for more information. The CompactFlash socket has 50 pins, 2 rows,
consecutive (1, 26), with 1.27mm pin spacing.
CAUTION
To prevent system hangs when using older CompactFlash cards,
ensure your CompactFlash is compatible with UDMA 100 IDE
hard disk drives. Consult your CompactFlash card vendor for
UDMA 100 compatibility.

Table 3-11. CompactFlash Interface Pin/Signal Descriptions (J8)

Pin # Signal
1 GND
2 SD3
3 SD4
4 SD5
5 SD6
6 SD7
7 SDCS1*
8, 9, 10, GND
11, 12
13 VCC
14, 15, GND
16, 17
18 SA2
19 SA1
20 SA0
LittleBoard 800
Description
Secondary Slave/Master Chip Select 3 – Used to select the host-accessible
Command Block Register.
Not connected
Ground
Description
Ground
Secondary Disk Data 3 – 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.
Secondary Disk Data 4 – Refer to SD3 on pin-2 for more information.
Secondary Disk Data 5 – Refer to SD3 on pin-2 for more information.
Secondary Disk Data 6 – Refer to SD3 on pin-2 for more information.
Secondary Disk Data 7 – Refer to SD3 on pin-2 for more information.
Secondary Chip Select 1 – This signal, along with CE2*, selects the CF and
indicates to the CF when a byte or word operation is being performed. This
signal accesses the even byte or odd byte of the word depending on A0 and CE2*.
Ground
Voltage Jumper (JP3) – Selects voltage; pins 1-2 = +5V or pins 2-3 = +3.3V.
Ground
Secondary Address Select 2 – One of three signals (0 – 2) used to select one of
eight registers in the Task File. The host grounds all remaining address lines.
Secondary Address Select 1 – Refer to SA2 on pin-18 for more information.
Secondary Address Select 0 – Refer to SA2 on pin-18 for more information.
Reference Manual
Hardware
37