STWBC2-HP datasheet(57/96 Pages) STMICROELECTRONICS

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Figure 56. IO fault detection circuit overview

While the probed state is equal to the reference, the counter and the FF used to memorize the fault condition are

reset, so incoherence_det_io is 0. When the probed state differs from the reference state, the counter increments.

If the counter counts to its maximum, the “RS” is set and incoherence_det_io signal passes 1.

The presence of the counter offers a debounce filter and accommodates for propagation delays. The counter

width is set to 3 bits.

The fault signal is a dynamic event in case of toggling IO. It has to be captured by an external logic to be

memorized and reported to the MCU. The incoherence_det_io lines are connected to the interrupt controller that

latches the request event.

The checkers' outputs are connected to the interrupt controller. This block is instantiating two times.

2.2.10.5

GDLS fault detection

The GDLS coherence checker verifies that the state of a GDLS corresponds effectively to the configured value.

This allows detecting short-circuit on GDLS signals.

When enabled, the cell compares a probed state of GDLS (data_in) with a reference state (GDLS data_out).

Figure 57. GDLS fault detection circuit overview

Note:

In the current implementation the “enable_check_gdls[2:0]” vector signal is kept fixed high.

While the probed state is equal to the reference, the counter and the FF used to memorize the fault condition

are reset, so incoherence_det_gdls is 0. When the probed state differs from the reference state, the counter

increments. If the counter counts to its maximum, the “RS” is set and incoherence_det_gdls signal passes 1.

The presence of the counter offers a debounce filter and accommodates for propagation delays. The counter

width is set to 3 bits.

The fault signal is a dynamic event in case of toggling IO. It has to be captured by an external logic to be

memorized and reported to the MCU. The incoherence_det_gdls lines are connected to the interrupt controller

that latches the request event.

The checkers' outputs are connected to the interrupt controller. This block instantiates twice.

2.2.10.6

Operating parameters

Table 41 summarizes the IP functional operating parameters.

STWBC2-HP

Digital AFE functions

DS13825 - Rev 1.0

page 57/96

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