TC58256AFTI View Datasheet(PDF) - Toshiba
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TC58256AFTI Datasheet PDF : 33 Pages
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TC58256AFTI
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.
CLE
CE
WE
ALE
RE
RY/BY
Busy
I/O
50H
A0~A3
512
527
Figure 5. Read mode (3) operation
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.)
Sequential Read (1) (2) (3)
This mode allows the sequential reading of pages without additional address input.
00H
01H
50H
Address input
tR
RY/BY
(00H)
0
Busy
527
Data output
(01H)
A
A
tR
Busy
Data output
(50H)
tR
Busy
512 527
A
Sequential Read (1)
Sequential Read (2)
Sequential Read (3)
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.
2001-05-30 19/33
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