TC58NS256DC

2000-08-27

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Read Mode (3)

Read mode (3) has the same timing as Read modes (1) and (2) but is used to access information in the extra

16-byte redundancy area of the page. The start pointer is therefore set to a value between byte 512 and byte

527.

Sequential Read (1) (2) (3)

This mode allows the sequential reading of pages without additional address input.

Sequential Read modes (1) and (2) output the contents of addresses 0~527 as shown above, while Sequential

Read mode (3) outputs the contents of the redundant address locations only. When the pointer reaches the last

address, the device continues to output the data from this address ** on each RE clock signal.

** Column address 527 on the last page.

BY

/

RY

WE

CLE

RE

Busy

50H

CE

ALE

I/O

Figure 5. Read mode (3) operation

527

Addresses bits A0~A3 are used to set the start pointer for the

redundant memory cells, while A4~A7 are ignored.

Once a 50H command has been issued, the pointer moves to

the redundant cell locations and only those 16 cells can be

addressed, regardless of the value of the A4-to-A7 address. (An

00H command is necessary to move the pointer back to the

0-to-511 main memory cell location.)

512

A0~A3

A

Sequential Read (1)

(00H)

0

527

A

Sequential Read (2)

(01H)

A

Sequential Read (3)

(50H)

512 527

BY

/

RY

00H

Busy

01H

Busy

Busy

Address input

Data output

50H

Data output