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TC58DVM92A1FT00

TENTATIVE TOSHIBA MOS DIGITAL INTEGRATED CIRCUIT SILICON GATE CMOS

Toshiba 

TC58DVM92A1FT00

Status Read

The device has three Status Read commands. There are Status Read (1) command “70H” and Status Read (2)

command “71H”.

The device automatically implements the execution and verification of the Program and Erase operations. The

Status Read function is used to monitor the Ready/Busy status of the device, determine the result (pass/fail) of a

Program or Erase operation, and determine whether the device is in Protect mode. The device status is output

via the I/O port on the RE clock after a Status Read command “70H” or “71H” input.

The resulting information of Status Read (1) command “70H” is outlined in Table 5 below and the resulting

information of Status Read (2) command “71H” are outlined in the explanation for Multi Block Program and

Multi Block Erase toward the end of this document.

Table 5. Status output table for Status Read (1) command “70H”

STATUS

OUTPUT

I/O1

Pass/Fail

Pass: 0

Fail: 1

I/O2

Not Used

0

I/O3

Not Used

0

I/O4

Not Used

0

I/O5

Not Used

0

The Pass/Fail status on I/O1 is only

valid when the device is in the Ready

state.

I/O6

Not Used

0

I/O7

Ready/Busy

Ready: 1

Busy: 0

I/O8

Write Protect

Protect: 0

Not Protected: 1

An application example with multiple devices is shown in Figure 6.

CE1

CE2

CE3

CEN

CEN  1

CLE

ALE

WE

RE

I/O1

to I/O8

RY/BY

Device

1

Device

2

Device

3

Device

N

Device

N 1

RY/BY

Busy

CLE

ALE

WE

CE1

CEN

RE

I/O

70H

70H

Status on Device 1

Status on Device N

Figure 6. Status Read timing application example

System Design Note: If the RY/BY pin signals from multiple devices are wired together as shown in the

diagram, the Status Read function can be used to determine the status of each individual device.

2003-01-10 25/44

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