A d v a n c e I n f o r m a t i o n
START
Read DQ7–DQ0
Addr = VA
Yes
DQ7 = Data?
No
No
DQ5 = 1?
Yes
Read DQ7–DQ0
Addr = VA
Yes
DQ7 = Data?
No
PASS
FAIL
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.
Figure 5. Data# Polling Algorithm
RY/BY#: Ready/Busy#
The RY/BY# is a dedicated, open-drain output pin that indicates whether an Em-
bedded 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
.
CC
February 18, 2005 S29AL004D_00_A1
S29AL004D
27
SPANSION [ SPANSION ]
