s29as008j Meet Spansion Inc., s29as008j Datasheet - Page 36

• Manufacturer Part Number: s29as008j
• Description: 8 Megabit 1 M X 8-bit/512 K X 16-bit Cmos 1.8 Volt-only Boot Sector Flash Memory
• Manufacturer: Meet Spansion Inc.

12.2
36
RY/BY#: Ready/Busy#
Notes
1. VA = Valid address for programming. During a sector erase operation, a valid address is an address within any sector selected for
2. DQ7 should be rechecked even if DQ5 = 1 because DQ7 may change simultaneously with DQ5.
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, several RY/BY# pins can be tied together in parallel with a
pull-up resistor to V
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 12.1 on page 39
on page
and erase operations, respectively.
erasure. During chip erase, a valid address is any non-protected sector address.
44,
Figure 18.5 on page 46
CC
.
shows the outputs for RY/BY#. Figures
D a t a
No
S h e e t
Figure 12.1 Data# Polling Algorithm
and
S29AS008J
Read DQ7–DQ0
Read DQ7–DQ0
Figure 18.6 on page 47
DQ7 = Data?
DQ7 = Data?
Addr = VA
Addr = VA
DQ5 = 1?
START
FAIL
( A d v a n c e
No
Yes
No
Yes
Yes
Figure 18.1 on page
I n f o r m a t i o n )
shows RY/BY# for read, reset, program,
PASS
S29AS008J_00_03 June 6, 2008
43,
Figure 18.2