L99LD21 datasheet(49/73 Pages) STMICROELECTRONICS

49 / 73 page

DS11130 Rev 5

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L99LD21

SPI functional description

Margin Mode

(load)

In this step, antifuses are compared

with a lower resistance than the

standard one - to be sure selected bits

are properly burned. Their content is

loaded into CTM register.

Send an SPI write to

CTM

00 111110 010

000000000000000000000

Margin Mode

(read)

During previous step, the result of MM

Read is loaded into the most

significant 16 bits of each

corresponding trimming register. A

read operation is required to read this

result.

Send an SPI read for

customer trimming

the SDO frame

received from device

01 111110 000

000000000000000000001

Margin Mode

(decision)

A decision must be taken, based on

the previous result. If antifuses were

not correctly burned after three steps,

then device must be discarded,

otherwise the flow can proceed.

If the answer to SPI

read operation is

different from:

xxxxxxxx

[ctmd]100000000000

x, then device must

be discarded.

Last bit depends on

odd parity check.

Final Blank

Check

(load)

In this step, antifuses are compared

with a higher resistance than the

standard one - to be sure unselected

bits are really unburned. Their content

is loaded in CTM register.

Send an SPI write to

CTM

00 111110 011

000000000000000000000

Final Blank

Check

(read)

During previous step, the result of

Blank Check Read is loaded into bits

(20÷13) of CTM register. A read

operation is required for each of them

to read this result.

Send an SPI read for

customer trimming

the SDO frame

received from device

01 111110 000

000000000000000000001

Final Blank

Check

(decision)

A decision must be taken, based on

the previous result. If antifuses were

damaged, device must be discarded,

otherwise the flow can proceed.

If the answer to SPI

read operation

operation is different

from: xxxxxxxx

[ctmd]100000000000

x, then device must

be discarded.

Last bit depends on

odd parity check.

Table 28. Testing procedure description (continued)

Step

Description

Action

SPI Frames (binary, unless

otherwise specified)

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