tmp19a43fd TOSHIBA Semiconductor CORPORATION, tmp19a43fd Datasheet - Page 15

• Manufacturer Part Number: tmp19a43fd
• Description: 32-bit Risc Microprocessor
• Manufacturer: TOSHIBA Semiconductor CORPORATION

3.
3.1 Flash Memory
Flash Memory Operation
This section describes the hardware configuration and operation of the flash memory. The feature of this device
is that the internal ROM of TMP19A43CDXBG is replaced by an internal flash memory. Other configurations
and functions of the device remain the same as with TMP19A43CDXBG. Please refer to the
TMP19A43CDXBG data sheet for functions not described in this section.
3.1.1
1) Memory size
2) Flash memory access
3) Write/erase time
4) Programming method
Rewriting method
The flash memory included in this device is generally compliant with the applicable JEDEC standards
except for some specific functions. Therefore, if the user is currently using an external flash memory
device, it is easy to implement the functions into this device. Furthermore, the user is not required to
build his/her own programs to realize complicated write and erase functions because such functions are
automatically performed using the circuits already built-in the flash memory chip.
This device is also implemented with a read-protect function to inhibit reading flash memory data from
any external writer device. On the other hand, rewrite protection is available only through command-
based software programming; any hardware setting method to apply +12VDC is not supported. The
above described protection function is automatically enabled when all the four area are configured for
protection. When the user removes protection, the internal data is automatically erased before the
protection is actually removed.
The TMP19A43FDXBG device contains 4M bits (512 kB) of flash memory. The memory area
consists of 4 independent memory blocks (128 kB u 4) to enable independent write access to each
block. When the CPU is to access the internal flash memory, 32-bit data bus width is used.
Interleave access is used in this device.
Write time: 2 sec/Chip (Typ)
Erase: 0.4 sec/Chip (Typ)
The onboard programming mode is available for the user to program (rewrite) the device while it is
mounted on the user's board.
(Note)
4-1) User boot mode
4-2) Single boot mode
Features
The user's original rewriting method can be supported.
The rewriting method to use serial data transfer (Toshiba's unique method) can be supported.
The above values are theoretical values not including data transfer time.
The write time per chip depends on the write method to be used by the user.
TMP19A43 (rev2.0)3-1
0.5 sec/128 Kbyte (Typ.)
100 msec/128 Kbyte (Typ.)
Flash Memory Operation
TMP19A43