S29CD016G SPANSION, S29CD016G Datasheet - Page 64

• Manufacturer Part Number: S29CD016G
• Description: 16 Megabit (512 K x 32-Bit) CMOS 2.5 Volt-only Burst Mode / Dual Boot / Simultaneous Read/Write Flash Memory
• Manufacturer: SPANSION

Notes:
1. Read toggle bit with two immediately consecutive reads to determine whether or not it is toggling. See text.
2. Recheck toggle bit because it may stop toggling as DQ5 changes to “1”. See text.
64
The remaining scenario is that the system initially determines that the toggle bit
is toggling and DQ5 has not gone high. The system may continue to monitor the
toggle bit and DQ5 through successive read cycles, determining the status as de-
scribed in the previous paragraph. Alternatively, it may choose to perform other
system tasks. In this case, the system must start at the beginning of the algo-
rithm when it returns to determine the status of the operation (top of
No
Figure 7. Toggle Bit Algorithm
Read Byte Twice
A d v a n c e
DQ6 = Toggle?
DQ6 = Toggle?
Adrdess = VA
Address = VA
Address = VA
(DQ 0-DQ7)
(DQ0-DQ7)
(DQ0-DQ7)
Read Byte
Read Byte
DQ5 = 1?
START
FAIL
S29CD016G
Yes
Yes
Yes
I n f o r m a t i o n
(Notes
1, 2)
(Note 1)
No
No
PASS
Figure
S29CD016_00_A4 November 5, 2004
7).