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DS42587 ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 28 Page - Advanced Micro Devices

๋ถ€ํ’ˆ๋ช… DS42587
์ƒ์„ธ๋‚ด์šฉ  Stacked Multi-Chip Package (MCP) Flash Memory and SRAM
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DS42587
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 13 and the following subsec-
tions describe the function of these bits. DQ7 and DQ6
each offer a method for determining whether a pro-
gram or erase operation is complete or in progress.
The device also provides a hardware-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 sys-
tem whethe r an Embed ded Pr ogr am or Er as e
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 ยตs, then that bank returns to reading
array data.
During the Embedded Erase algorithm, Data# Polling
produces a โ€œ0โ€ on DQ7. When the Embedded Erase
algorithm is complete, or if the bank enters the Erase
Suspend mode, Data# Polling produces a โ€œ1โ€ 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 ยตs, then
the bank returns to reading array data. If not all se-
lected sectors are protected, the Embedded Erase
algorithm erases the unprotected sectors, and ignores
the selected 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 DQ0โ€“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 DQ0โ€“DQ6 may be still
invalid. Valid data on DQ0โ€“DQ7 will appear on suc-
cessive read cycles.
Table 13 shows the outputs for Data# Polling on DQ7.
Figure 5 shows the Data# Polling algorithm. Figure 22
in the AC Characteristics section shows the Data#
Polling timing diagram.
Figure 5.
Data# Polling Algorithm
DQ7 = Data?
Yes
No
No
DQ5 = 1?
No
Yes
Yes
FAIL
PASS
Read DQ7โ€“DQ0
Addr = VA
Read DQ7โ€“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 = โ€œ1โ€ because
DQ7 may change simultaneously with DQ5.


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