Ampro LittleBoard 800, Reference Manual

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Chapter 3 Hardware
LittleBoard 800 Reference Manual 37
Pin # Signal Description
38 SDCS3 Secondary Slave/Master Chip Select 3 – Used to select the host-accessible
Command Block Register.
39 NC Not connected
40 GND Ground
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 Description
1 GND Ground
2 SD3 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.
3 SD4 Secondary Disk Data 4 – Refer to SD3 on pin-2 for more information.
4 SD5 Secondary Disk Data 5 – Refer to SD3 on pin-2 for more information.
5 SD6 Secondary Disk Data 6 – Refer to SD3 on pin-2 for more information.
6 SD7 Secondary Disk Data 7 – Refer to SD3 on pin-2 for more information.
7 SDCS1* 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*.
8, 9, 10,
11, 12 GND Ground
13 VCC Voltage Jumper (JP3) – Selects voltage; pins 1-2 = +5V or pins 2-3 = +3.3V.
14, 15,
16, 17 GND Ground
18 SA2 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.
19 SA1 Secondary Address Select 1 – Refer to SA2 on pin-18 for more information.
20 SA0 Secondary Address Select 0 – Refer to SA2 on pin-18 for more information.