Cypress CY7C1312AV18 用户手册

Document #: 38-05497 Rev. *A

Page 5 of 21

Q

[x:0]

Outputs-

Synchronous

Data Output signals. These pins drive out the requested data during a Read operation. 

Valid data is driven out on the rising edge of both the C and C clocks during Read 

operations or K and K when in single clock mode. When the Read port is deselected, 

Q

[x:0]

 are automatically tri-stated. 

CY7C1310AV18 

− Q

[7:0]

CY7C1312AV18 

− Q

[17:0]

CY7C1314AV18 

− Q

[35:0]

RPS

Input-

Synchronous

Read Port Select, active LOW. Sampled on the rising edge of Positive Input Clock (K). 

When active, a Read operation is initiated. Deasserting will cause the Read port to be 

deselected. When deselected, the pending access is allowed to complete and the output 

drivers are automatically tri-stated following the next rising edge of the C clock. Each 

read access consists of a burst of two sequential transfers.

C

Input-Clock

Positive Output Clock Input. C is used in conjunction with C to clock out the Read data 

from the device. C and C can be used together to deskew the flight times of various 

devices on the board back to the controller. See application example for further details.

C

Input-Clock

Negative Output Clock Input. C is used in conjunction with C to clock out the Read data 

from the device. C and C can be used together to deskew the flight times of various 

devices on the board back to the controller. See application example for further details.

K

Input-Clock

Positive Input Clock Input. The rising edge of K is used to capture synchronous inputs 

to the device and to drive out data through Q

[x:0] 

when in single clock mode. All accesses 

are initiated on the rising edge of K. 

K

Input-Clock

Negative Input Clock Input. K is used to capture synchronous inputs being presented 

to the device and to drive out data through Q

[x:0]

 when in single clock mode.

CQ

Echo Clock

CQ is referenced with respect to C. This is a free running clock and is synchronized 

to the output clock(C) of the QDR-II. In the single clock mode, CQ is generated with 

respect to K. The timings for the echo clocks are shown in the AC timing table.

CQ

Echo Clock

CQ is referenced with respect to C. This is a free running clock and is synchronized 

to the output clock(C) of the QDR-II. In the single clock mode, CQ is generated with 

respect to K. The timings for the echo clocks are shown in the AC timing table.

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 V

DD

, 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 will turn off the DLL inside 

the device. The timings in the DLL turned off operation will be different from those listed 

in this data sheet. More details on this operation can be found in the application note, 

“DLL Operation in the QDR-II.”

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/36M

N/A

Address expansion for 36M. This is not connected to the die and so can be tied to any 

voltage level.

NC/72M

N/A

Address expansion for 72M. This is not connected to the die and so can be tied to any 

voltage level.

V

SS

/72M

Input

Address expansion for 72M. This must be tied LOW on the 18M devices.

V

SS

/144M

Input

Address expansion for 144M. This must be tied LOW on the 18M devices.

V

SS/

288M

Input

Address expansion for 288M. This must be tied LOW on the 18M devices.

 (continued)