Cypress CY7C1422BV18 Referenced with Respect to, TDO for Jtag, TCK Pin for Jtag, TDI Pin for Jtag

						CY7C1422BV18, CY7C1429BV18
						CY7C1423BV18, CY7C1424BV18
Pin Definitions (continued)
	Pin Name	IO				Pin Description
	CQ	Echo 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 timings
			for the echo clocks is shown in the Switching Characteristics on page 23.
		Echo Clock		Referenced with Respect to		. This is a free-running clock and is synchronized to the input clock
	CQ		CQ		C
			for output data (C) of the DDR-II. In the single clock mode, CQ is generated with respect to K. The timings
			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, this pin can be connected directly to VDDQ, which enables the
			minimum impedance mode. This pin cannot be connected directly to GND or left unconnected.
		Input	DLL Turn Off − Active LOW. Connecting this pin to ground turns off the DLL inside the device. The timing
	DOFF
			in the DLL turned off operation differs from those listed in this data sheet. For normal operation, this pin
			can be connected to a pull up through a 10-Kohm or less pull up resistor. The device behaves in DDR-I
			mode when the DLL is turned off. In this mode, the device can be operated at a frequency of up to 167
			MHz with DDR-I timing.
	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. Can be tied to any voltage level.
	NC/72M	N/A	Not Connected to the Die. Can be tied to any voltage level.
	NC/144M	N/A	Not Connected to the Die. Can be tied to any voltage level.
	NC/288M	N/A	Not Connected to the Die. Can be tied 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 #: 001-07035 Rev. *D Page 7 of 30

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