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参数资料
| 型号： | AM29DS163DB100WAKN |
| 厂商： | Advanced Micro Devices, Inc. |
| 英文描述： | 16 Megabit CMOS 1.8 Volt-only, Simultaneous Operation Flash Memory |
| 中文描述： | 16兆位的CMOS 1.8伏只，同时作业快闪记忆体 |
| 文件页数： | 28/50页 |
| 文件大小： | 1682K |
| 代理商： | AM29DS163DB100WAKN |
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Am29DS163D
A D V A N C E I N F O R M A T I O N
WRITE OPERATION STATUS
The device provides several bits to determine the sta-
tus of a program or erase operation: DQ2, DQ3, DQ5,
DQ6, and DQ7.
Table 15 on page 31
and the following
subsections describe the function of these bits. DQ7
and DQ6 each offer a method for determining whether
a program or erase operation is complete or in
progress. The device also provides a hardware-based
output signal, RY/BY#, to determine whether an Em-
bedded Program or Erase operation is in progress or
is completed.
DQ7: Data# Polling
The Data# Polling bit, DQ7, indicates to the host sys-
tem whether an Embedded Program or Erase
algorithm is in progress or completed, or whether a
bank is in Erase Suspend. Data# Polling is valid after
the rising edge of the final WE# pulse in the command
sequence.
During the Embedded Program algorithm, the device
outputs on DQ7 the complement of the datum pro-
grammed to DQ7. This DQ7 status also applies to
programming during Erase Suspend. When the Em-
bedded Program algorithm is complete, the device
outputs the datum programmed to DQ7. The system
must provide the program address to read valid status
information on DQ7. If a program address falls within a
protected sector, Data# Polling on DQ7 is active for
approximately 1 μs, then that bank returns to reading
array data.
During the Embedded Erase algorithm, Data# Polling
produces a “0” on DQ7. When the Embedded Erase
algorithm is complete, or if the bank enters the Erase
Suspend mode, Data# Polling produces a “1” on DQ7.
The system must provide an address within any of the
sectors selected for erasure to read valid status infor-
mation on DQ7.
After an erase command sequence is written, if all
sectors selected for erasing are protected, Data# Poll-
ing on DQ7 is active for approximately 100 μs, then the
bank returns to reading array data. If not all selected
sectors are protected, the Embedded Erase algorithm
erases the unprotected sectors, and ignores the se-
lected sectors that are protected. However, if the
system reads DQ7 at an address within a protected
sector, the status may not be valid.
Just prior to the completion of an Embedded Program
or Erase operation, DQ7 may change asynchronously
with DQ0–DQ6 while Output Enable (OE#) is asserted
low. That is, the device may change from providing
status information to valid data on DQ7. Depending on
when the system samples the DQ7 output, it may read
the status or valid data. Even if the device completes
the program or erase operation and DQ7 contains
valid data, the data outputs on DQ0–DQ6 may be still
invalid. Valid data on DQ0–DQ7 appears on succes-
sive read cycles.
Table 15 on page 31
shows the outputs for Data# Poll-
ing on DQ7.
Figure 5
shows the Data# Polling
algorithm.
Figure 21, on page 42
shows the Data#
Polling timing diagram.
Figure 5. Data# Polling Algorithm
DQ7 = Data
Yes
No
No
DQ5 = 1
No
Yes
Yes
FAIL
PASS
Read DQ7–DQ0
Addr = VA
Read DQ7–DQ0
Addr = VA
DQ7 = Data
START
Notes:
1. VA = Valid address for programming. During a sector
erase operation, a valid address is any sector address
within the sector being erased. 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.
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