SimpleTech Zeus Ultra manual 22

Functional DescriptionZeus SSD Functional Blocks

Table 4. ATA (IDE) Connector Pinout Configuration (Continued)

Pin	Pin Type	Signal Symbol	Signal Name	Signal Description
27	I	IORDY	I/O READY	Not used, and pulled up to Vcc through a
				4.7k ohm resistor.
28	I	-CSEL	CABLE SELECT	This internally pulled up signal is used to
				configure the drives as the Master or the
				Slave device. When the pin is grounded, the
				device is configured as a Master. When the
				pin is open, the device is configured as a
				Slave.
29	I	-DACK	DMA ACKNOWLEDGE	Not used
30	Ground	GND	—	Ground
31	O	INTRQ	INTERRUPT REQUEST	This is an interrupt request from the
				controller to the host, asking for service.
				This signal is the active high Interrupt
				Request to the host.
32	O	-IOS16	I/O SELECT 16	Not used
33	I	A1	HOST ADDRESS 1	This address line (A1) is used to select one
				of eight registers in the controller Task File.
34	I/O	-PDIAG		After an Executive diagnostic command to
				indicate to the Master it has passed its
				diagnostics, this bi-directional open drain
				signal is asserted by the Slave.
35	I	A0	HOST ADDRESS 0	These address lines (A0 and A2) are used to
				select one of eight registers in the controller
36	I	A2	HOST ADDRESS 2
				Task File.
37	I	-CS1	HOST CHIP SELECT 1	The chip select signal used to select the
				Task File register.
38	I	-CS2	HOST CHIP SELECT 2	The chip select signal used to select the
				Alternate Status register and the Device
				Control register.
39	I/O	-DASP	DISK ACTIVE/SLAVE	This input/output is the Disk Active/Slave
			PRESENT	Present signal in the Master/Slave
				handshake protocol.
40	Ground	GND	—	Ground
41*	—	VCC	Supply Voltage	5V power supply
42*	—	VCC	Supply Voltage	5V power supply
43*	Ground	GND	—	Ground
44*	—	—	—	No connection
* Applies to 44-pin, 2.5-inch SSD only
16				Zeus Ultra DMA Solid State Drives