Cypress CY7C1541V18 manual TDO for Jtag, TCK Pin for Jtag, TDI Pin for Jtag, TMS Pin for Jtag

				CY7C1541V18, CY7C1556V18
				CY7C1543V18, CY7C1545V18
Pin Definitions (continued)
	Pin Name	IO		Pin Description
	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. Alternately, 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 timings
	DOFF
			in the DLL turned off operation are different from those listed in this data sheet. For normal operation, this
			pin can be connected to a pull up through a 10 KΩ or less pull up resistor. The device behaves in QDR-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 QDR-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/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 and Outputs as
		Reference	well as AC 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: 001-05389 Rev. *F Page 7 of 28

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