Cypress CY7C1177V18 Pin Definitions, Pin Name Pin Description, Synchronous Read/Write Input. When

CY7C1166V18, CY7C1177V18

CY7C1168V18, CY7C1170V18

Pin Definitions

Pin Name

IO

Pin Description

DQ[x:0]

Input Output-

Data Input Output Signals. Inputs are sampled on the rising edge of K and

clocks during valid

K

Synchronous

write operations. These pins drive out the requested data when a read operation is active. Valid data

is driven out on the rising edge of both the K and K clocks during read operations. When read access

is deselected, Q[x:0] are automatically tri-stated.

CY7C1166V18 − DQ[7:0]

CY7C1177V18 − DQ[8:0]

CY7C1168V18 − DQ[17:0]

CY7C1170V18 − DQ[35:0]

Input-

Synchronous Load. This input is brought LOW when a bus cycle sequence is to be defined. This

LD

Synchronous

definition includes address and read/write direction. All transactions operate on a burst of two data.

LD must meet the setup and hold times around edge of K. LD must meet the setup and hold times

around edge of K.

0,

1,

Input-

Nibble Write Select 0, 1 − Active LOW.(CY7C1166V18 Only) Sampled on the rising edge of the K

NWS

NWS

Synchronous

and K clocks during write operations. It 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 ignores the corresponding nibble of data 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

Synchronous

during Write operations. It is used to select the byte that is written into the device during the current

BWS2, BWS3

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

CY7C1177V18 − BWS0

controls D[8:0]

CY7C1168V18 − BWS0

controls D[8:0], and

BWS

1 controls D[17:9].

CY7C1170V18 − 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

ignores the corresponding byte of data 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 (two arrays each of1M x 8) for CY7C1166V18, 2M x 9 (two arrays each of 1M

x 9) for CY7C1177V18, 1M x 18 (two arrays each of 512K x 18) for CY7C1168V18, and 512K x 36

(two arrays each of 256K x 18) for CY7C1170V18. All the address inputs are ignored when the

appropriate port is deselected.

Input-

R/W

Synchronous Read/Write Input. When

is LOW, this input designates the access type (read

LD

Synchronous

is LOW) for loaded address. R/W must meet the setup and hold

when R/W is HIGH, write when R/W

times around edge of K.

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 being presented to the device

K

K

Clock

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

CQ

Clock Output

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

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

on page 22.

Clock Output

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

CQ

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

on page 22.

Document Number: 001-06620 Rev. *D

Page 6 of 27

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