AM29LV008T データシートの表示（PDF） - Advanced Micro Devices

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AM29LV008T

8 Megabit (1,048,576 x 8-Bit) CMOS 3.0 Volt-only, Sectored Flash Memory

Advanced Micro Devices 

PRELIMINARY

RY/BY: Ready/Busy Pin

The Am29LV008 provides a RY/BY open-drain output

pin as a way to indicate to the host system that the Em-

bedded Algorithms are either in progress or have been

completed. If the output is low, the device is busy with

either a program or erase operation. If the output is

high, the device is ready to accept any read/write or

erase operation. When the RY/BY pin is low, the device

will not accept any additional program or erase com-

mands with the exception of the Erase Suspend com-

mand. If the Am29LV008 is placed in an Erase

Suspend mode, the RY/BY output will be high. For pro-

gramming, the RY/BY is valid (RY/BY=0) after the ris-

ing edge of the fourth WE pulse in the four write pulse

sequence. For chip erase, the RY/BY is valid after the

rising edge of the sixth WE pulse in the six write pulse

sequence. For sector erase, the RY/BY is also valid

after the rising edge of the sixth WE pulse.

Since the RY/BY pin is an open-drain output, several

RY/BY pins can be tied together in parallel with a

pull-up resistor to VCC.

Table 7. Toggle Bit Status

Mode

DQ7

DQ6

DQ2

Program

DQ7

Toggles

1

Erase

0

Toggles

Toggles

Erase-Suspend Read (Note 1) (Erase-Suspended Sector)

1

1

Toggles

Erase Suspend Program

DQ7 (Note 2)

Toggles

1 (Note 2)

Notes:

1. These status flags apply when outputs are read from a sector that has been erase suspended.

2. These status flags apply when outputs are read from the addresses of the non-erase suspended sector.

CE

WE

RY/BY

LAST_BUS_CYCLE

Figure 1. RY/BY Timing Diagram

tBUSY

20511C-4

18

Am29LV008T/Am29LV008B

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