PM0020 datasheet(77/87 Pages) STMICROELECTRONICS

77 / 87 page

PM00020

ISC logic description

77/87

Once the end of sector is reached, the program flow cannot jump to the next sector.

After the end of the sector is reached, the execution of next ISC_PROGRAM instruction is

not allowed without shifting in a new address. This avoids that, continuing to repeat the

steps from 3 to 7 once the end of sector is reached, the program flow starts again from the

beginning of the sector. This control isn't active if the program flow is interrupted before

reaching the end of sector.

OTP may be programmed many times until the OTP Lock bit is set, it cannot ever be erased.

If the Lock bit is set, the program instruction is not executed and no error flag is set.

Once the end of sector is reached, the program flow cannot jump to the next sector.

DR-Scan

Shift in 64 bits of data to be

programmed

Run-Test/Idle

Program starts/address incremented

Wait for 50 us. Begin polling

IR-Scan

Load ISC-NOOP

DR-Scan

Shift out status

Repeat step 7 until ready = 1

Go back to step 3, repeat steps 3-7

until end of sector is reached.

Run-Test/Idle

End

Table 42.

OTP program flow (Lock bit: blocked)

Step

Tap activity

Comment

Run-Test/Idle

Start

IR-Scan

Load ISC_ADDRESS_SHIFT

DR-Scan

Shift in the 8 bit OTP address -

70 Hex

IR-Scan

Load ISC_PROGRAM

DR-Scan

Shift in 64 bits of data to be

programmed

Run-Test/Idle

Program starts/address

incremented

Wait for 50 us. Begin polling

IR-Scan

Load ISC-NOOP

DR-Scan

Shift out status

Repeat step 7 until ready = 1

Go back to step 3, repeat steps

3-7 three more times (256 bits)

Run-Test/Idle

End

Table 41.

Main and Secondary Flash sectors program flow (continued)

Step

Tap Activity

Comment

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