Cypress CY7C1427AV18 Referenced with Respect to, TDO for Jtag, TCK Pin for Jtag, TDI Pin for Jtag

						CY7C1416AV18, CY7C1427AV18
						CY7C1418AV18, CY7C1420AV18
Pin Definitions (continued)
	Pin Name	IO				Pin Description
	CQ	Output Clock	CQ Referenced with Respect to C. This is a free-running clock and is synchronized to the input clock
			for output data (C) of the DDR-II. In the single clock mode, CQ is generated with respect to K. The timing
			for the echo clocks is shown in the Switching Characteristics on page 23.
	CQ	Output Clock	CQ	Referenced with Respect to	C	. This is a free-running clock and is synchronized to the input clock
			for output data (C) of the DDR-II. In the single clock mode, CQ is generated with respect to K. The timing
			for the echo clocks is shown in the Switching Characteristics on page 23.
	ZQ	Input	Output Impedance Matching Input. This input is used to tune the device outputs to the system data bus
			impedance. CQ, CQ, and Q[x:0] output impedance are set to 0.2 x RQ, where RQ is a resistor connected
			between ZQ and ground. Alternatively, connect this pin directly to VDDQ, which enables the minimum
			impedance mode. This pin cannot be connected directly to GND or left unconnected.
	DOFF	Input	DLL Turn Off − Active LOW. Connecting this pin to ground turns off the DLL inside the device. The timing
			in the DLL turned off operation differs from those listed in this data sheet.
	TDO	Output	TDO for JTAG.
	TCK	Input	TCK Pin for JTAG.
	TDI	Input	TDI Pin for JTAG.
	TMS	Input	TMS Pin for JTAG.
	NC	N/A	Not Connected to the Die. Tie to any voltage level.
	NC/72M	N/A	Not Connected to the Die. Tie to any voltage level.
	NC/144M	N/A	Not Connected to the Die. Tie to any voltage level.
	NC/288M	N/A	Not Connected to the Die. Tie to any voltage level.
	VREF	Input-	Reference Voltage Input. Static input used to set the reference level for HSTL inputs, outputs, and AC
		Reference	measurement points.
	VDD	Power Supply	Power Supply Inputs to the Core of the Device.
	VSS	Ground	Ground for the Device.
	VDDQ	Power Supply	Power Supply Inputs for the Outputs of the Device.

Document Number: 38-05616 Rev. *F Page 7 of 31

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