Document Number: 002-00870 Rev.*K

Page 35 of 56

S29AS008J

Figure 12.1 Data# Polling Algorithm

Notes

1. VA = Valid address for programming. During a sector erase operation, a valid address is an address within any sector selected for erasure. During chip erase, a valid

address is any non-protected sector address.

2. DQ7 should be rechecked even if DQ5 = 1 because DQ7 may change simultaneously with DQ5.

12.2

RY/BY#: Ready/Busy#

The RY/BY# is a dedicated, open-drain output pin that indicates whether an Embedded Algorithm is in progress or complete. The

RY/BY# status is valid after the rising edge of the final WE# pulse in the command sequence. Since RY/BY# is an open-drain output,

If the output is low (Busy), the device is actively erasing or programming. (This includes programming in the Erase Suspend mode.)

If the output is high (Ready), the device is ready to read array data (including during the Erase Suspend mode), or is in the standby

mode.

Table on page 38 shows the outputs for RY/BY#. Figures Figure 18.1 on page 42, Figure 18.2 on page 43, Figure 18.5 on page 46

and Figure 18.6 on page 46 shows RY/BY# for read, reset, program, and erase operations, respectively.

DQ7 = Data?

Yes

No

No

DQ5 = 1?

No

Yes

Yes

FAIL

PASS

Read DQ7–DQ0

Addr = VA

Read DQ7–DQ0

Addr = VA

DQ7 = Data?

START