TH50VSF2580AASB Datasheet, PDF (30/50 Pages) Toshiba Semiconductor – SRAM AND FLASH MEMORY MIXED MULTI-CHIP PACKAGE

DQ3 (Block Erase timer)
TH50VSF2580/2581AASB
The Block Erase operation starts 50 µs (the Erase Hold Time) after the rising edge of WE in the last
command cycle. DQ3 outputs a 0 for the duration of the Block Erase Hold Time and a 1 when the Block Erase
operation starts. Additional Block Erase commands can only be accepted during the Block Erase Hold Time.
Each Block Erase command input within the hold time resets the timer, allowing additional blocks to be marked
for erasing. DQ3 outputs a 1 if the Program or Erase operation fails.
DQ2 (Toggle bit 2)
DQ2 is used to indicate which blocks have been selected for Auto Block Erase or to indicate whether the
device is in Erase Suspend Mode.
If data is read continuously from the selected block during an Auto Block Erase, the DQ2 output will toggle.
Now 1 will be output from non-selected blocks; thus, the selected block can be ascertained. If data is read
continuously from the block selected for Auto Block Erase while the device is in Erase Suspend Mode, the DQ2
output will toggle. Because the DQ6 output is not toggling, it can be determined that the device is in Erase
Suspend Mode. If data is read from the address to which data is being written during Erase Suspend in
Programming Mode, DQ2 will output a 1.
RY/BY (READY /BUSY )
The TH50VSF2580/2581AASB has a RY/BY signal to indicate the device status to the host processor. A 0
(Busy state) indicates that an Auto-Program or auto-erase operation is in progress. A 1 (Ready state) indicates
that the operation has finished and that the device can now accept a new command. RY/BY outputs a 0 when
an operation has failed.
RY/BY outputs a 0 after the rising edge of WE in the last command cycle.
During an Auto Block Erase operation, commands other than Erase Suspend are ignored. RY/BY outputs a
1 during an Erase Suspend operation. The output buffer for the RY/BY pin is an open-drain type circuit,
allowing a wired-OR connection. A pull-up resistor must be inserted between VCC and the RY/BY pin.
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