Cypress CY7C1425JV18 manual Truth Table, Write Cycle Descriptions, Rps Wps, BWS0 BWS1, NWS1

CY7C1410JV18, CY7C1425JV18

CY7C1412JV18, CY7C1414JV18

Truth Table

The truth table for CY7C1410JV18, CY7C1425JV18, CY7C1412JV18, and CY7C1414JV18 follows. [2, 3, 4, 5, 6, 7]

Operation				K	RPS	WPS	DQ		DQ
Write Cycle:				L-H	X	L	D(A + 0) at K(t) ↑		D(A + 1) at
										K(t) ↑
Load address on the rising edge of	K;
input write data on K and K rising edges.
Read Cycle:				L-H	L	X	Q(A + 0) at		Q(A + 1) at C(t + 2) ↑
								C(t + 1) ↑
Load address on the rising edge of K;
wait one and a half cycle; read data on		C	and C rising edges.
NOP: No Operation				L-H	H	H	D = X		D = X
							Q = High-Z		Q = High-Z
Standby: Clock Stopped				Stopped	X	X	Previous State		Previous State

Write Cycle Descriptions

The write cycle description table for CY7C1410JV18 and CY7C1412JV18 follows. [2, 8]

BWS0/	BWS1/		K			Comments
					K
NWS0		NWS1
L		L	L–H		–	During the data portion of a write sequence:
						CY7C1410JV18 − both nibbles (D[7:0]) are written into the device.
						CY7C1412JV18 − both bytes (D[17:0]) are written into the device.
L		L	–	L-H		During the data portion of a write sequence:
						CY7C1410JV18 − both nibbles (D[7:0]) are written into the device.
						CY7C1412JV18 − both bytes (D[17:0]) are written into the device.
L		H	L–H		–	During the data portion of a write sequence:
						CY7C1410JV18 − only the lower nibble (D[3:0]) is written into the device, D[7:4]		remains unaltered.
						CY7C1412JV18 − only the lower byte (D[8:0]) is written into the device, D[17:9]	remains unaltered.
L		H	–	L–H		During the data portion of a write sequence:
						CY7C1410JV18 − only the lower nibble (D[3:0]) is written into the device, D[7:4]		remains unaltered.
						CY7C1412JV18 − only the lower byte (D[8:0]) is written into the device, D[17:9]	remains unaltered.
H		L	L–H		–	During the data portion of a write sequence:
						CY7C1410JV18 − only the upper nibble (D[7:4]) is written into the device, D[3:0]		remains unaltered.
						CY7C1412JV18 − only the upper byte (D[17:9]) is written into the device, D[8:0]	remains unaltered.
H		L	–	L–H		During the data portion of a write sequence:
						CY7C1410JV18 − only the upper nibble (D[7:4]) is written into the device, D[3:0]		remains unaltered.
						CY7C1412JV18 − only the upper byte (D[17:9]) is written into the device, D[8:0]	remains unaltered.
H		H	L–H		–	No data is written into the devices during this portion of a write operation.
H		H	–	L–H		No data is written into the devices during this portion of a write operation.

Notes

2.X = “Don't Care,” H = Logic HIGH, L = Logic LOW, ↑represents rising edge.

3.Device powers up deselected with the outputs in a tri-state condition.

4.“A” represents address location latched by the devices when transaction was initiated. A + 0, A + 1 represents the internal address sequence in the burst.

5.“t” represents the cycle at which a Read/Write operation is started. t + 1, and t + 2 are the first, and second clock cycles respectively succeeding the “t” clock cycle.

6.Data inputs are registered at K and K rising edges. Data outputs are delivered on C and C rising edges, except when in single clock mode.

7.It is recommended that K = K and C = C = HIGH when clock is stopped. This is not essential, but permits most rapid restart by overcoming transmission line charging symmetrically.

8.Is based on a write cycle that was initiated in accordance with the Write Cycle Descriptions table. NWS0, NWS1,BWS0, BWS1,BWS2 and BWS3 can be altered on different portions of a write cycle, as long as the setup and hold requirements are achieved.

Document #: 001-12561 Rev. *D Page 10 of 26

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