Cypress CY7C1472BV25, CY7C1474BV25, CY7C1470BV25 manual Truth Table, Address Operation, Used

CY7C1470BV25

CY7C1472BV25, CY7C1474BV25

Table 4. Truth Table

The truth table for CY7C1470BV25, CY7C1472BV25, and CY7C1474BV25 follows. [1, 2, 3, 4, 5, 6, 7]

	Address
Operation		CE	ZZ	ADV/LD	WE	BWx	OE	CEN	CLK	DQ
	Used
Deselect Cycle	None	H	L	L	X	X	X	L	L-H	Tri-State
Continue Deselect Cycle	None	X	L	H	X	X	X	L	L-H	Tri-State
Read Cycle	External	L	L	L	H	X	L	L	L-H	Data Out (Q)
(Begin Burst)
Read Cycle	Next	X	L	H	X	X	L	L	L-H	Data Out (Q)
(Continue Burst)
NOP/Dummy Read	External	L	L	L	H	X	H	L	L-H	Tri-State
(Begin Burst)
Dummy Read	Next	X	L	H	X	X	H	L	L-H	Tri-State
(Continue Burst)
Write Cycle	External	L	L	L	L	L	X	L	L-H	Data In (D)
(Begin Burst)
Write Cycle	Next	X	L	H	X	L	X	L	L-H	Data In (D)
(Continue Burst)
NOP/Write Abort	None	L	L	L	L	H	X	L	L-H	Tri-State
(Begin Burst)
Write Abort	Next	X	L	H	X	H	X	L	L-H	Tri-State
(Continue Burst)
Ignore Clock Edge (Stall)	Current	X	L	X	X	X	X	H	L-H	–
Sleep Mode	None	X	H	X	X	X	X	X	X	Tri-State

Notes

1.X = “Don't Care”, H = Logic HIGH, L = Logic LOW, CE stands for ALL Chip Enables active. BWx = L signifies at least one Byte Write Select is active, BWx = Valid signifies that the desired Byte Write Selects are asserted, see “Partial Write Cycle Description” on page 11 for details.

2.Write is defined by WE and BW[a:d]. See “Partial Write Cycle Description” on page 11 for details.

3.When a write cycle is detected, all IOs are tri-stated, even during Byte Writes.

4.The DQ and DQP pins are controlled by the current cycle and the OE signal.

5.CEN = H inserts wait states.

6.Device powers up deselected with the IOs in a tri-state condition, regardless of OE.

7.OE is asynchronous and is not sampled with the clock rise. It is masked internally during write cycles.During a Read cycle DQs and DQP[a:d] = tri-state when OE is inactive or when the device is deselected, and DQs = data when OE is active.

Document #: 001-15032 Rev. *D Page 10 of 29

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