Cypress Semiconductor CY7C1511V18 User Manual Page 6
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CY7C1511V18, CY7C1526V18
CY7C1513V18, CY7C1515V18
Document Number: 38-05363 Rev. *F Page 6 of 32
Pin Definitions
Pin Name IO Pin Description
D
[x:0]
Input-
Synchronous
Data Input Signals. Sampled on the rising edge of K and K clocks when valid write operations are active.
CY7C1511V18 − D
[7:0]
CY7C1526V18 − D
[8:0]
CY7C1513V18 − D
[17:0]
CY7C1515V18 − D
[35:0]
WPS Input-
Synchronous
Write Port Select − Active LOW. Sampled on the rising edge of the K clock. When asserted active, a
write operation is initiated. Deasserting deselects the write port. Deselecting the write port ignores D
[x:0]
.
NWS
0
,
NWS
1
,
Input-
Synchronous
Nibble Write Select 0, 1 − Active LOW (CY7C1511V18 Only). Sampled on the rising edge of the K and
K
clocks
when write operations are active
. Used to select which nibble is written into the device
during
the current portion of the write operations.
NWS
0
controls D
[3:0]
and NWS
1
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 it is not written into the device
.
BWS
0
,
BWS
1
,
BWS
2
,
BWS
3
Input-
Synchronous
Byte Write Select 0, 1, 2 and 3 − Active LOW. Sampled on the rising edge of the K and K clocks when
write operations are active. Used to select which byte is written into the device during the current portion
of the write operations. Bytes not written remain unaltered.
CY7C1526V18 − BWS
0
controls D
[8:0]
CY7C1513V18 − BWS
0
controls D
[8:0]
and BWS
1
controls D
[17:9].
CY7C1515V18 − BWS
0
controls D
[8:0]
, BWS
1
controls D
[17:9]
,
BWS
2
controls D
[26:18]
and BWS
3
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 it is not written into the device
.
A Input-
Synchronous
Address Inputs. Sampled on the rising edge of the K clock during active read and write operations. These
address inputs are multiplexed for both read and write operations. Internally, the device is organized as
8M x 8 (4 arrays each of 2M x 8) for CY7C1511V18, 8M x 9 (4 arrays each of 2M x 9) for CY7C1526V18,
4M x 18 (4 arrays each of 1M x 18) for CY7C1513V18 and 2M x 36 (4 arrays each of 512K x 36) for
CY7C1515V18. Therefore, only 21 address inputs are needed to access the entire memory array of
CY7C1511V18 and CY7C1526V18, 20 address inputs for CY7C1513V18 and 19 address inputs for
CY7C1515V18. These inputs are ignored when the appropriate port is deselected.
Q
[x:0]
Outputs-
Synchronous
Data Output Signals. These pins drive out the requested data when the read operation is active. Valid
data is driven out on the rising edge of the C and C
clocks during read operations, or K and K when in
single clock mode. On deselecting the read port, Q
[x:0]
are automatically tri-stated.
CY7C1511V18 − Q
[7:0]
CY7C1526V18 − Q
[8:0]
CY7C1513V18 − Q
[17:0]
CY7C1515V18 − 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 deselects the read port. 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 four sequential transfers.
C Input Clock Positive Input Clock for Output data. 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 on page 10 for further details.
C
Input Clock Negative Input Clock for Output data. 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 on page 10 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.
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