STPM098C datasheet(22/110 Pages) STMICROELECTRONICS

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Table 16. ABIST activation register

ABIST_EN

Description

ABIST procedure disabled (default)

ABIST procedure enabled

When both are enabled, the MBIST procedure is carried out first.

When MBIST is performed:

•

If no MBIST error is detected, the procedure is ended and the state machine evolves to the next stage;

•

If an MBIST error is detected, the device reacts by establishing SAFE_HIZ and preventing any further

device operation. The device persists in this state until another power-up sequence is forced.

When ABIST is performed:

•

If no ABIST error is detected, the procedure is ended and the state machine evolves to the next stage;

•

If an ABIST error is detected, the ABIST_FAIL bit is set and the state machine evolves to the next stage.

Table 17. ABIST status register

ABIST_FAIL

Description

NO ABIST failure

ABIST procedure failure

MBIST FAIL state corresponds to LOCKUP STATE.

Figure 14. BIST procedure state machine

NVM

DWNL

nvm_dwnl_end=‘1’ (10us deglitch) &

memory_bist_enable=‘0’ &

abist_disable=‘1’

abist_end=‘1’

MBIST

RUN

ADDR

LATCH

ABIST

RUN

nvm_dwnl_end=‘1’ (10us deglitch) &

memory_bist_enable=‘1’

mbist_end=‘1’ &

memory_bist_fail=‘0’ (or mbist_fail_enable=‘0’) &

abist_disable=‘1’

mbist_end=‘1’ &

memory_bist_fail=‘0’ (or mbist_fail_enable=‘0’) &

abist_disable=‘0’

MBIST

FAIL

mbist_end=‘1’ &

memory_bist_fail=‘1’ &

mbist_fail_enable=‘1’

To FULL ON

From WAIT POR_ANA

RELEASE

nvm_dwnl_end=‘1’ (10us deglitch) &

memory_bist_enable=‘1’ &

abist_disable=‘0’

BIST mode retriggering

In case of a fault detection during the analog BIST check at power-up (ABIST_FAIL = 1), a fault confirmation can

be performed by triggering an additional procedure run through the two dedicated PMBus™ commands

MFR_ABIST_RESTART and MFR_ADC_SELFTEST_RESTART.

STPM098C

Functional description

DS14440 - Rev 1

page 22/110

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