TH50VSF2582 Datasheet, PDF (22/50 Pages) Toshiba Semiconductor – SRAM AND FLASH MEMORY MIXED MULTI-CHIP PACKAGE

Auto-Program Mode
TH50VSF2582/2583AASB
The TH50VSF2582/2583AASB can be programmed in either byte or word units. Auto-Program Mode is set
using the Program command. The program address is latched on the falling edge of the WE signal and data is
latched on the rising edge of the fourth Bus Write cycle (with WE control). Auto programming starts on the
rising edge of the WE signal in the fourth Bus Write cycle. The Program and Program Verify commands are
automatically executed by the chip. The device status during programming is indicated by the Hardware
Sequence flag. To read the Hardware Sequence flag, specify the address to which the Write is being performed.
During Auto-Program execution, a command sequence for the bank on which execution is being performed
cannot be accepted. To terminate execution, use a hardware reset. Note that if the Auto-Program operation is
terminated in this manner, the data written so far is invalid.
Any attempt to program a protected block is ignored. In this case the device enters Read Mode 3 µs after the
rising edge of the WE signal in the fourth Bus Write cycle.
If an Auto-Program operation fails, the device remains in the programming state and does not automatically
return to Read Mode. The device status is indicated by the Hardware Sequence flag. Either a Reset command or
a hardware reset is required to return the device to Read Mode after a failure. If a programming operation fails,
the block which contains the address to which data could not be programmed should not be used.
The device allows 0s to be programmed into memory cells which contain a 1. 1s cannot be programmed into
cells which contain 0s. If this is attempted, execution of Auto Program will fail. This is a user error, not a device
error. A cell containing 0 must be erased in order to set it to 1.
Fast Program Mode
Fast Program is a function which enables execution of the command sequence for the Auto Program to be
completed in two cycles. In this mode the first two cycles of the command sequence, which normally requires
four cycles, are omitted. Writing is performed in the remaining two cycles. To execute Fast Program, input the
Fast Program command. Write in this mode uses the Fast Program command but operation is the same at that
for ordinary Auto-Program. The status of the device is indicated by the Hardware Sequence flag and read
operations can be performed as usual. To exit this mode, the Fast Program Reset command must be input.
When the command is input, the device will return to Read Mode.
Acceleration Mode
The TH50VSF2582/2583AASB features Acceleration Mode which allows write time to be reduced. Applying
VACC to WP or ACC automatically sets the device to Acceleration Mode. In Acceleration Mode, Block Protect
Mode changes to Temporary Block Unprotect Mode. Write Mode changes to Fast Program Mode. Modes are
switched by the WP/ACC signal; thus, there is no need for a Temporary Block Unprotect operation or to set or
reset Fast Program Mode. Operation of Write is the same as in Auto-Program Mode. Removing VACC from
WP/ACC terminates Acceleration Mode.
2001-10-25 22/50