am42bds640ag Meet Spansion Inc., am42bds640ag Datasheet - Page 63

• Manufacturer Part Number: am42bds640ag
• Description: 64 Megabit 4 M ? 16-bit Cmos 1.8 Volt-only, Simultaneous Operation, Burst Mode Flash Memory And 16 Mbit 1 M ? 16-bit Static Ram Preliminary
• Manufacturer: Meet Spansion Inc.

AC CHARACTERISTICS
Note: Breakpoints in waveforms indicate that system may alternately read array data from the “non-busy bank” while checking
the status of the program or erase operation in the “busy” bank. The system should read status twice to ensure valid information.
62
Addresses
AVD#
WE#
Data
OE#
CE#f
t
WPH
Command Sequence
PA/SA
t
AS
Sector Erase
Last Cycle in
Program or
t
WC
Figure 33. Back-to-Back Read/Write Cycle Timings
t
WP
PD/30h
t
t
AH
DS
t
t
t
OEH
DH
OE
P R E L I M I N A R Y
t
RA
SR/W
t
ACC
Read status (at least two cycles) in same bank
Am42BDS640AG
t
RC
and/or array data from other bank
RD
t
OEZ
t
OEH
RA
t
RC
RD
t
command sequence
GHWL
write or program
555h
Begin another
November 1, 2002
t
WC
AAh