參數(shù)資料
型號： AM29BDS640G
廠商： Spansion Inc.
英文描述： 64 Megabit (4 M x 16-Bit) CMOS 1.8 Volt-only Simultaneous Read/Write, Burst Mode Flash Memory
中文描述： 64兆位（4個M x 16位）的CMOS 1.8伏，只有同時讀/寫，突發(fā)模式閃存
文件頁數(shù)： 26/65頁
文件大?。?/td> 899K
代理商： AM29BDS640G
October 31, 2002
Am29BDS640G
31
AD V A NCE
INF O R M A T IO N
RDY: Ready
The RDY is a dedicated output that, by default, indi-
cates (when at logic low) the system should wait 1
clock cycle before expecting the next word of data.
Using the RDY Configuration Command Sequence,
RDY can be set so that a logic low indicates the system
should wait 2 clock cycles before expecting valid data.
RDY functions only while reading data in burst mode.
The following conditions cause the RDY output to be
low: during the initial access (in burst mode), and after
the boundary that occurs every 64 words beginning
with the 64th address, 3Fh.
DQ6: Toggle Bit I
Toggle Bit I on DQ6 indicates whether an Embedded
Program or Erase algorithm is in progress or complete,
or whether the device has entered the Erase Suspend
mode. Toggle Bit I may be read at any address in the
same bank, and is valid after the rising edge of the final
WE# pulse in the command sequence (prior to the
program or erase operation), and during the sector
erase time-out.
During an Embedded Program or Erase algorithm
operation, successive read cycles to any address
cause DQ6 to toggle. When the operation is complete,
DQ6 stops toggling.
After an erase command sequence is written, if all
sectors selected for erasing are protected, DQ6
toggles for approximately 100 s, then returns to
reading array data. If not all selected sectors are pro-
tected, the Embedded Erase algorithm erases the
unprotected sectors, and ignores the selected sectors
that are protected.
The system can use DQ6 and DQ2 together to deter-
mine whether a sector is actively erasing or is
erase-suspended. When the device is actively erasing
(that is, the Embedded Erase algorithm is in progress),
DQ6 toggles. When the device enters the Erase
Suspend mode, DQ6 stops toggling. However, the
system must also use DQ2 to determine which sectors
are erasing or erase-suspended. Alternatively, the
system can use DQ7 (see the subsection on DQ7:
Data# Polling).
If a program address falls within a protected sector,
DQ6 toggles for approximately 1 ms after the program
command sequence is written, then returns to reading
array data.
DQ6 also toggles during the erase-suspend-program
mode, and stops toggling once the Embedded
Program algorithm is complete.
See the following for additional information: Figure 4
(toggle bit flowchart), DQ6: Toggle Bit I (description),
Figure 5.
Toggle Bit Algorithm
DQ2: Toggle Bit II
The “Toggle Bit II” on DQ2, when used with DQ6, indi-
cates whether a particular sector is actively erasing
(that is, the Embedded Erase algorithm is in progress),
START
No
Yes
DQ5 = 1?
No
Yes
DQ6 = Toggle?
No
Read Byte
DQ7–DQ0
Address = VA
DQ6 = Toggle?
Read Byte Twice
DQ7–DQ0
Address = VA
Read Byte
DQ7–DQ0
Address = VA
FAIL
PASS
Note: The system should recheck the toggle bit even if DQ5
= “1” because the toggle bit may stop toggling as DQ5
changes to “1.” See the subsections on DQ6 and DQ2 for
more information.
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