Ampro Corporation 700 manual Pdiow, Pdiordy, Pdcsel, Pddack, PDA1, PDA0, PDA2, PDCS1, PDCS3

Chapter 3			Hardware
	Pin #	Signal	Description
	22	GND	Digital Ground
	23	PDIOW*	Primary Device 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.
	24	GND	Digital Ground
	25	PDIOR*	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.
	26	GND	Digital Ground
	27	PDIORDY	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.
	28	PDCSEL	Primary Cable Select – Used to configure IDE drives as device 0 or device 1
			using a special cable.
	29	PDDACK*	Primary DMA Channel Acknowledge – Used by the host to acknowledge data
			has been accepted or data is available. Used in response to DMARQ asserted.
	30	GND	Digital Ground
	31	IRQ14	Interrupt Request 14 – Asserted by drive when it has pending interrupt (PIO
			transfer of data to or from the drive to the host).
	32	NC	Not connected (IOCS16*)
	33	PDA1	Primary IDE ATA Disk Address (0 to 2). Used to indicate which byte in the
			ATA command block or control block is being accessed
	34	PD33/66	UDMA 33/66 Sense – Senses which DMA mode to use for IDE devices.
	35	PDA0	Primary IDE ATA Disk Address (0 to 2). Used to indicate which byte in the
			ATA command block or control block is being accessed
	36	PDA2	Primary IDE ATA Disk Address (0 to 2). Used to indicate which byte in the
			ATA command block or control block is being accessed
	37	PDCS1*	Primary Slave/Master Chip Select 1 – Used to select the host-accessible
			Command Block Register.
	38	PDCS3*	Primary Slave/Master Chip Select 3 – Used to select the host-accessible
			Command Block Register.
	39	IDE LED1	IDE Activity –Indicates IDE drive activity to yellow IDE LED (D4) on card
			edge..
	40	GND	Digital Ground
	41	+5V	+5 volt power ±10%
	42	+5V	+5 volt power ±10%
	43	GND	Digital Ground
	44	NC	Not connected

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

34 Reference Manual ReadyBoard 700