Ampro Corporation Littleboard 550 manual SDA1, SDA0, SDA2, SDCS1#, SDCS3#

Chapter 3 Hardware

Pin #	Signal	Description
33	SDA1	Secondary Disk Address 1 – One of three signals (0 – 2) used to indicate which
		byte in the ATA command block or control block is being accessed.
34	SD33_66	UDMA 33/66 Sense – Used to detect the presence of an 80 conductor IDE cable
		on the secondary IDE channel. Enables BIOS to sense which DMA mode to
		use for IDE devices.
35	SDA0	Secondary Disk Address 0 – Refer to SDA1 on pin-33 for more information.
36	SDA2	Secondary Disk Address 2 – Refer to SDA1 on pin-33 for more information.
37	SDCS1#	Secondary Slave/Master Chip Select 1 – Used to select the host-accessible
		Command Block Register.
38	SDCS3#	Secondary Slave/Master Chip Select 3 – Used to select the host-accessible
		Command Block Register.
39	Reserved	Reserved
40	GND	Ground

Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.

38 Reference Manual LittleBoard 550