TMP89FS60 datasheet(331/410 Pages) TOSHIBA

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Page 317

TMP89FS60

RA003

21.3.4 Product ID entry

This command activates the product ID mode. If an instruction to read the flash memory is executed in Prod-

uct ID mode, the vendor ID, flash ID and security status can be read from the flash memory.

21.3.5 Product ID exit

This command is used to exit the Product ID mode.

21.3.6 Security program

If the security program is enabled, the flash memory is read protected in parallel PROM mode, and the flash

memory overwrite command and the RAM loader command cannot be executed in serial PROM mode.

To disable the security program, the chip erase must be performed. To check whether the security program is

enabled or disabled, read 0xFF7F in product ID mode. Refer to Table 21-4 for further details. The time needed

to enable or disable the security program is 40

µs maximum. The next command sequence cannot be executed

until the security program setting is completed. To check the completion of the security program setting, per-

form read operations twice on the same address in the flash memory, and perform polling until the same data is

read. When the security program setting is being made, bit 6 is reversed each time a read is performed.

21.4 Toggle Bit (D6)

After the flash memory write, the chip erase, and the security program command sequence are executed, the value

of the 6th bit (D6) in data read by a read operation is reversed each time a read is performed. This bit reversal can be

used as a software mechanism for checking the completion of each operation. Normally, perform read operations

twice on the same address in the flash memory, and perform polling until the same data is read from the flash mem-

ory.

After the flash memory write, the chip erase, and the security program command sequence are executed, the toggle

bit read by the first read operation is always "1".

Note 1: If FLSCR1<FLSMD> is set to "disable", the toggle bit is not reversed.

Note 2: Do not read the toggle bit by using a 16-bit transfer instruction. If the toggle bit is read using a 16-bit transfer

instruction, the toggle bit does not function properly.

Note 3: Because the instruction cycle is longer than the write time in SLOW mode, the value is not reversed, even if the

toggle bit is read right after the Byte Program is performed.

Table 21-4 Values to Be Read in Product ID Mode

Address

Meaning

Read value

0xF000

Vendor ID

0x98

0xF001

Flash ID

0x4D

0xFF7F

Security status

0xFF:

Security program disabled

Other than 0xFF: Security program enabled

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