CY7C1392BV18, CY7C1992BV18

CY7C1393BV18, CY7C1394BV18

Switching Waveforms

Figure 5. Read/Write/Deselect Sequence [26, 27, 28]

NOP

READ

READ

WRITE

WRITE

READ

NOP

 

 

(burst of 2)

(burst of 2)

(burst of 2)

(burst of 2)

(burst of 2)

 

 

1

2

3

4

5

6

7

8

K

K

LD

R/W

A

D

Q

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tKH

 

tKL

 

tCYC

tKHKH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tSC

 

A0

 

A1

A2

 

A3

 

A4

 

 

t

SA

t

HA

 

tHD

 

 

tHD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tSD

 

 

tSD

 

 

 

 

 

 

 

 

D20

D21

D30

D31

 

 

 

 

 

Q00

Q01

Q10

Q11

 

Q40

Q41

 

 

 

t KHCH

tCLZ

tCQD

tDOH

 

 

 

 

 

 

 

 

 

 

 

tKHCH

 

 

 

tCO

tCQDOH

 

 

tCHZ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

C#

CQ

CQ#

tCQOH

tCQOH

tCCQO

tKH

tCCQO

tKL

tCYC

tKHKH

DON’T CARE

UNDEFINED

Notes

26.Q00 refers to output from address A0. Q01 refers to output from the next internal burst address following A0, that is, A0+1.

27.Outputs are disabled (High-Z) one clock cycle after a NOP.

28.In this example, if address A4 = A3, then data Q40 = D30 and Q41 = D31. Write data is forwarded immediately as read results. This note applies to the whole diagram.

Document #: 38-05623 Rev. *D

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Cypress CY7C1393BV18, CY7C1992BV18, CY7C1394BV18, CY7C1392BV18 manual Switching Waveforms, Burst