Cypress Semiconductor CY7C1473BV33 Bedienungsanleitung PDF herunterladen (Seite 10)

CY7C1471BV33

CY7C1473BV33

Document Number: 001-15029 Rev. *G Page 10 of 31

Truth Table

The truth table for CY7C1471BV33, and CY7C1473BV33 follows.

[1, 2, 3, 4, 5, 6, 7]

Operation Address Used CE

ZZ ADV/LD WE BW

OE CEN CLK DQ

Deselect cycle None H X X L L X X X L L->H Tri-state

Deselect cycle None X X H L L X X X L L->H Tri-state

Deselect cycle None X L X L L X X X L L->H Tri-state

Continue deselect cycle None X X X L H X X X L L->H Tri-state

Read cycle (begin burst) External L H L L L H X L L L->H Data out (Q)

Read cycle (continue burst) Next X X X L H X X L L L->H Data out (Q)

NOP/Dummy read (begin burst) External L H L L L H X H L L->H Tri-state

Dummy read (continue burst) Next X X X L H X X H L L->H Tri-state

Write cycle (begin burst) External L H L L L L L X L L->H Data in (D)

Write cycle (continue burst) Next X X X L H X L X L L->H Data in (D)

NOP/Write abort (begin burst) None L H L L L L H X L L->H Tri-state

Write abort (continue burst) Next X X X L H X H X L L->H Tri-state

Ignore clock edge (stall) Current X X X L X X X X H L->H –

Sleep mode None X X XH X XXXX X Tri-state

Notes

1. X = “Don't Care.” H = Logic HIGH, L = Logic LOW. BW

= L signifies at least one Byte Write Select is active, BW

= Valid signifies that the desired Byte Write Selects

are asserted, see section Truth Table for Read/Write on page 11 for details.

2. Write is defined by BW

, and WE. See section Truth Table for Read/Write on page 11.

3. When a Write cycle is detected, all I/Os are tri-stated, even during Byte Writes.

4. The DQs and DQP

pins are controlled by the current cycle and the OE signal. OE is asynchronous and is not sampled with the clock.

5. CEN

= H, inserts wait states.

6. Device powers up deselected with the I/Os 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

= tri-state when OE is

inactive or when the device is deselected, and DQs and DQP

= data when OE is active.

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Cypress Semiconductor CY7C1473BV33 Bedienungsanleitung Seite 10