Ampro Corporation XTX 820 Pideiow, Pideior, Piderdy, Cblidp, Pideak, Pideintrq, PIDEA1, Pdiag

Chapter 3				Hardware
	J4	Signal	40-	Description
	Pin #		Pin #
		GND	22	Ground
	54	PIDE_IOW*	23	Drive I/O Write – 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.
		GND	24	Ground
	52	PIDE_IOR*	25	Drive I/O Read – 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.
		GND	26	Ground
	48	PIDE_RDY	27	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.
	90	CBLID_P*	28	Cable ID Select – Used to detects the presence of an 80 conductor
				IDE cable on the primary IDE channel. This allows BIOS or
				system software to determine if is necessary to enable high-speed
				transfer modes (DMA66 or DMA100).
	46	PIDE_AK*	29	DMA Channel Acknowledge – Used by the host to acknowledge
				data has been accepted or data is available. Used in response to
				DMARQ asserted.
		GND	30	Ground
	44	PIDE_INTRQ	31	Drive Interrupt Request (IRQ 14)– Asserted by drive when it has
				pending interrupt (PIO transfer of data to or from the drive to the
				host).
	NC	NC	32	Not Connected
	40	PIDE_A1	33	Drive Address Bus 1 – Used (0 to 2) to indicate which byte in the
				ATA command block or control block (register) is being accessed.
	NC	PDIAG*	34	Not Connected (Passed Diagnostics)
	38	PIDE_A0	35	Drive Address Bus 0 – Used (0 to 2) to indicate which byte in the
				ATA command block or control block (register) is being accessed.
	36	PIDE_A2	36	Drive Address Bus 2 – Used (0 to 2) to indicate which byte in the
				ATA command block or control block (register) is being accessed.
	32	PIDE_CS1*	37	Chip Select 1 – Used to select the host-accessible Command Block
				Register.
	30	PIDE_CS3*	38	Chip Select 3 – Used to select the host-accessible Command Block
				Register.
	NC	DASP*	39	Not Connected (Drive Active/Drive Present)
		GND	40	Ground

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

XTX 820 Reference Manual 47