k8d6316u Samsung Semiconductor, Inc., k8d6316u Datasheet - Page 28

• Manufacturer Part Number: k8d6316u
• Description: 64m Bit 8m X8/4m X16 Dual Bank Nor Flash Memory
• Manufacturer: Samsung Semiconductor, Inc.

K8D6x16UTM / K8D6x16UBM
DEVICE STATUS FLAGS
The K8D6316U has means to indicate its status of operation in the bank where a program or erase operation is in processes.
Address must include bank address being excuted internal routine operation. The status is indicated by raising the device status flag
via corresponding DQ pins or the RY/ BY pin. The corresponding DQ pins are DQ7, DQ6, DQ5, DQ3 and DQ2. The statuses are as
follows :
Table 13. Hardware Sequence Flags
Notes :
1. DQ2 will toggle when the device performs successive read operations from the erase suspended block.
2. If DQ5 is High (exceeded timing limits), successive reads from a problem block will cause DQ2 to toggle.
DQ7 : Data Polling
When an attempt to read the device is made while executing the Internal Program, the complement of the data is written to DQ7 as
an indication of the Routine in progress. When the Routine is completed an attempt to access to the device will produce the true data
written to DQ7. When a user attempts to read the device during the Erase operation, DQ7 will be low. If the device is placed in the
Erase Suspend Mode, the status can be detected via the DQ7 pin. If the system tries to read an address which belongs to a block
that is being erased, DQ7 will be high. If a non-erased block address is read, the device will produce the true data to DQ7. If an
attempt is made to program a protected block, DQ7 outputs complements the data for approximately 1 s and the device then returns
to the Read Mode without changing data in the block. If an attempt is made to erase a protected block, DQ7 outputs complement
data in approximately 100us and the device then returns to the Read Mode without erasing the data in the block.
DQ6 : Toggle Bit
Toggle bit is another option to detect whether an Internal Routine is in progress or completed. Once the device is at a busy state,
DQ6 will toggle. Toggling DQ6 will stop after the device completes its Internal Routine. If the device is in the Erase Suspend Mode,
an attempt to read an address that belongs to a block that is being erased will produce a high output of DQ6. If an address belongs
to a block that is not being erased, toggling is halted and valid data is produced at DQ6.
If an attempt is made to program a protected block, DQ6 toggles for approximately 1us and the device then returns to the Read
Mode without changing the data in the block. If an attempt is made to erase a protected block, DQ6 toggles for approximately 100 s
and the device then returns to the Read Mode without erasing the data in the block.
DQ5 : Exceed Timing Limits
If the Internal Program/Erase Routine extends beyond the timing limits, DQ5 will go High, indicating program/erase failure.
In Progress
Time Limits
Exceeded
Programming
Block Erase or Chip Erase
Erase Suspend Read
Erase Suspend Read
Erase Suspend
Program
Programming
Block Erase or Chip Erase
Erase Suspend Program
Status
Erase Suspended
Block
Non-Erase Sus-
pended Block
Non-Erase Sus-
pended Block
DQ7
Data
DQ7
DQ7
DQ7
DQ7
0
1
0
28
Toggle
Toggle
Toggle
Toggle
Toggle
Toggle
DQ6
Data
1
DQ5
Data
0
0
0
0
1
1
1
FLASH MEMORY
DQ3
Data
0
1
0
0
0
1
0
(Note 1)
(Note 2)
Toggle
Toggle
Toggle
Toggle
DQ2
Data
No
No
1
1
Revision 1.5
March 2005
RY/BY
0
0
1
1
0
0
0
0