L5965 datasheet(52/73 Pages) STMICROELECTRONICS

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After power-on release, the SAF (Antifuse cell) FSM (Finite State Machine) starts to download all SAF rows to

internal DFFs. When the auto download has finished, if Prim Id (bit15~13, ROW9) are “000”, the FSM will go to

OTP program mode for customer usage.

In this mode, the user could program/burn SAF rows:

•

Write data to SAF_REG_DI via SPI

•

Set SAF parameter in SAF_REG_CFG via SPI

The program/burn command should be sent to SAF_REG_OP via SPI, then the data in SAF_REG_DI will be

burned in SAF cells.

USR_ Area _PROTECTION (bit15~13 of ROW12) is used to protect SAF rows from re-burning; when the bits are

“111”, the burning command for USR SAF rows can’t be executed. So the Row12 must be the last one to be

burned in the USR Area.

In OTP program mode, the saf_addr should be from 8~12; otherwise the saf_opration_error flag will be set.

Table 13 shows the detailed instructions on how to program an OTP row.

Table 13. OTP row programming

Step

Description

Action

SPI Frame

Enter

OTP

prog

mode

Power on device. If OTP has

not been burned yet, the

device goes to OTP program

mode

Power on device.

Burn

OTP

In this step, selected words

(indicated as data1) must be

written to a selected row of

OTP (address indicated as

row_addr)

Write register SAF_REG_DI = “data1” via SPI.

Note: bit15~13 of this register is crc of data1, it is auto

calculated by digital circuit.

DI frame:

Bit31=’1’, bit30~23 =“0x32”,

Bit22=’1’, bit21=’0’, bit20~5=data1,

bit4~0=CRC.

Write register SAF_REG_CFG=“0x7000” via SPI;

note: saf_hv_en_force_decoding (bit14~bit12 of this register)

should be set to "111", otherwise the burn operation is

forbidden.

DI frame:

Bit31=’1’, bit30~23 =“0x31”,

Bit22=’1’, bit21=’1’,

bit20~5=“0x7000”, bit4~0=CRC.

Send burn command and address of selected row of OTP.

Write register SAF_REG_OP=“0x001[row_addr]” via SPI

DI frame:

Bit31=’1’, bit30~23 =“0x30”,

Bit22=’1’, bit21=’0’,

bit20~11=“0x000”,

Bit10~9=”01”,

Bit8~5=”row_addr”,

bit4~0=CRC.

Wait end of write procedure, then read register

SAF_REG_STAT via SPI. For first reading, don’t care DO

frame.

DI frame:

Bit31=’0’, bit30~23 =“0x34”,

Bit22=’1’, bit21=’1’, bit20~5=”--”,

bit4~0=CRC.

Read register SAF_REG_STAT via SPI again.

Saf_busy (bit4 of this register)=’1’ indicates burn operation is

not finished, then wait a moment and read this register again.

Saf_busy =’0’ indicates burn operation is finished.

Saf_opration_error (bit6 of this register) =’0’ indicates the burn

operation is valid, otherwise invalid.

DI frame:

Bit31=’0’, bit30~23 =“0x34”,

Bit22=’1’, bit21=’0’, bit20~5=”--”,

bit4~0=CRC.

DO frame:

Check if bit28~21=“0x34”,

If bit9=’0’, if bit11=’0’.

Read

OTP

In this step, read the selected

row of OTP

Write register SAF_REG_CFG=“0xXXXX” via SPI;

This is not necessary, you can skip it if you keep saf_r_code

default.

L5965

OTP program mode

DS12567 - Rev 3

page 52/73

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