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Document Number: 002-00856 Rev. *E
S29JL064J
8. The fourth cycle of the autoselect command sequence is a read cycle. The system must provide the bank address to obtain the manufacturer ID, device ID, or Secured
Silicon Region factory protect information. Data bits DQ15–DQ8 are don’t care. While reading the autoselect addresses, the bank address must be the same until a
reset command is given. See
Autoselect Command Sequence on page 27
for more information.
9. The device ID must be read across the fourth, fifth, and sixth cycles.
10. The data is 81h for factory locked, 41h for customer locked, and 01h for not factory/customer locked.
11. The data is 00h for an unprotected sector/sector block and 01h for a protected sector/sector block.
12. The Unlock Bypass command is required prior to the Unlock Bypass Program command.
13. The Unlock Bypass Reset command is required to return to the read mode when the bank is in the unlock bypass mode.
14. The system may read and program in non-erasing sectors, or enter the autoselect mode, when in the Erase Suspend mode. The Erase Suspend command is valid
only during a sector erase operation, and requires the bank address.
15. The Erase Resume command is valid only during the Erase Suspend mode, and requires the bank address.
16. Command is valid when device is ready to read array data or when device is in autoselect mode.
17. Additional sector erase commands during the time-out period after an initial sector erase are one cycle long and identical to the sixth cycle of
the sector erase command sequence (SA / 30).
11. Write Operation Status
The device provides several bits to determine the status of a program or erase operation: DQ2, DQ3, DQ5, DQ6, and DQ7.
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 Embedded Program or Erase operation is in progress or has been completed.
11.1
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 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 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 active for approximately 1 µs, then that bank 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 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 information on DQ7.
After an erase command sequence is written, if all sectors selected for erasing are protected, Data# Polling on DQ7 is active for
approximately 3 ms, then the bank returns to the read mode. If not all selected 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.
When the system detects DQ7 has changed from the complement to true data, it can read valid data at DQ15–DQ0 (or DQ7–DQ0
for x8-only device) on the
following
read cycles. Just prior to the completion of an Embedded Program or Erase operation, DQ7 may
change asynchronously with DQ15–DQ8 (DQ7–DQ0 for x8-only device) 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 completed the program or erase operation and DQ7 has valid
data, the data outputs on DQ15–DQ0 may be still invalid. Valid data on DQ15–DQ0 (or DQ7–DQ0 for x8-only device) will appear on
successive read cycles.
shows the outputs for Data# Polling on DQ7.
shows the Data# Polling algorithm.
shows the Data# Polling timing diagram.