Pin definitions – Cypress CY7C1316JV18 User Manual

Page 7

CY7C1316JV18, CY7C1916JV18
CY7C1318JV18, CY7C1320JV18

Document Number: 001-15271 Rev. *B

Page 7 of 26

Output Clock CQ is 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 single clock mode, CQ is generated with respect to K. The timing for
the echo clocks is shown in

Switching Characteristics

on page 22.

Output Clock CQ is 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 single clock mode, CQ is generated with respect to K. The timing for
the echo clocks is shown in

Switching Characteristics

on page 22.

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 V

DDQ

, 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 is different from that 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.

N/A