Cypress CY7C1143V18, CY7C1145V18 manual Pin Definitions, Pin Name Pin Description, BWS2, BWS3, Qvld

CY7C1141V18, CY7C1156V18

CY7C1143V18, CY7C1145V18

Pin Definitions

Pin Name

IO

Pin Description

D[x:0]

Input-

Data Input Signals. Sampled on the rising edge of K and

clocks during valid write operations.

K

Synchronous

CY7C1141V18−D[7:0]

CY7C1156V18−D[8:0]

CY7C1143V18−D[17:0]

CY7C1145V18−D[35:0]

Input-

Write Port Select − Active LOW. Sampled on the rising edge of the K clock. When asserted active,

WPS

Synchronous

a write operation is initiated. Deasserting deselects the write port. Deselecting the write port causes

D[x:0] to be ignored.

0,

1,

Input-

Nibble Write Select 0, 1 − Active LOW.(CY7C1141V18 Only) Sampled on the rising edge of the K

NWS

NWS

Synchronous

and K clocks during write operations. This is used to select the nibble that is written into the device

NWS0 controls D[3:0] and NWS1 controls D[7:4].

All the Nibble Write Selects are sampled on the same edge as the data. Deselecting a Nibble Write

Select causes the corresponding nibble of data to be ignored and not written into the device.

0,

1,

Input-

Byte Write Select 0, 1, 2, and 3 − Active LOW. Sampled on the rising edge of the K and

clocks

BWS

BWS

K

BWS2, BWS3

Synchronous

during write operations. This is used to select the byte that is written into the device during the current

portion of the write operations. Bytes not written remain unaltered.

CY7C1156V18 − BWS0

controls D[8:0]

CY7C1143V18 − BWS0

controls D[8:0] and BWS1 controls D[17:9].

CY7C1145V18 − BWS0

controls D[8:0], BWS1 controls D[17:9], BWS2 controls D[26:18], and BWS3

controls D[35:27].

All the Byte Write Selects are sampled on the same edge as the data. Deselecting a Byte Write Select

causes the corresponding byte of data to be ignored and not written into the device.

A

Input-

Address Inputs. Sampled on the rising edge of the K clock during active read and write operations.

Synchronous

These address inputs are multiplexed for both read and write operations. Internally, the device is

organized as 2M x 8 (4 arrays each of 512K x 8) for CY7C1141V18, 2M x 9 (4 arrays each of 512K

x 9) for CY7C1156V18, 1M x 18 (4 arrays each of 256K x 18) for CY7C1143V18, and 512K x 36 (4

arrays each of 128K x 36) for CY7C1145V18. Therefore, only 19 address inputs are needed to access

the entire memory array of CY7C1141V18 and CY7C1156V18, 18 address inputs for CY7C1143V18

and 17 address inputs for CY7C1145V18. These inputs are ignored when the appropriate port is

deselected.

Q[x:0]

Outputs-

Data Output signals. These pins drive out the requested data during a read operation. Valid data is

Synchronous

driven out on the rising edge of both the K and K 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.

CY7C1141V18−Q[7:0]

CY7C1156V18−Q[8:0]

CY7C1143V18−Q[17:0]

CY7C1145V18−Q[35:0]

Input-

Read Port Select − Active LOW. Sampled on the rising edge of Positive Input Clock (K). When

RPS

Synchronous

active, a read operation is initiated. Deasserting causes the read port to be deselected. When

deselected, the pending access is enabled to complete and the output drivers are automatically

tri-stated following the next rising edge of the K clock. Each read access consists of a burst of four

sequential transfers.

QVLD

Valid output

Valid Output Indicator. The Q Valid indicates valid output data. QVLD is edge aligned with CQ and

indicator

CQ.

K

Input-

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

Clock

and to drive out data through Q[x:0] when in single clock mode. All accesses are initiated on the rising

edge of K.

Input-

Negative Input Clock Input.

is used to capture synchronous inputs presented to the device and

K

K

Clock

to drive out data through Q[x:0] when in single clock mode.

CQ

Echo Clock

Synchronous Echo Clock Outputs. This is a free running clock and is synchronized to the input

clock (K) of the QDR-II+. The timings for the echo clocks are shown in the “Switching Characteristics”

on page 23.

Document Number: 001-06583 Rev. *D

Page 6 of 28

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