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参数资料
| 型号： | Am29LV641DH90RZE |
| 厂商： | Advanced Micro Devices, Inc. |
| 英文描述： | 8 Characters x 2 Lines, 5x7 Dot Matrix Character and Cursor |
| 中文描述： | 64兆位（4个M x 16位），3.0伏的CMOS只均匀部门闪光控制记忆与VersatileI |
| 文件页数： | 25/57页 |
| 文件大小： | 1467K |
| 代理商： | AM29LV641DH90RZE |
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30
Am29LV640D/Am29LV641D
September 20, 2002
WRITE OPERATION STATUS
The device provides several bits to determine the status of
a program or erase operation: DQ2, DQ3, DQ5, DQ6, and
DQ7. Table 11 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 hard-
ware-based output signal, RY/BY#, to determine whether
an Embedded Program or Erase operation is in progress or
has been completed.
DQ7: Data# Polling
The Data# Polling bit, DQ7, indicates to the host system
whether an Embedded Program or Erase algorithm is in
progress or completed, or whether the device 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 out-
puts on DQ7 the complement of the datum programmed to
DQ7. This DQ7 status also applies to programming during
Erase Suspend. When the Embedded 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 ac-
tive for approximately 1 s, then the device returns to the
read mode.
During the Embedded Erase algorithm, Data# Polling
produces a “0” on DQ7. When the Embedded Erase
algorithm is complete, or if the device 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 s, then
the device returns to the read mode. 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 sys-
tem 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 has com-
pleted the program or erase operation and DQ7 has
valid data, the data outputs on DQ0–DQ6 may be still
invalid. Valid data on DQ0–DQ7 will appear on suc-
cessive read cycles.
Table 11 shows the outputs for Data# Polling on DQ7.
in the AC Characteristics section shows the Data#
Polling timing diagram.
Figure 5.
Data# Polling Algorithm
DQ7 = Data?
Yes
No
DQ5 = 1?
No
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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