L9663 datasheet(32/104 Pages) STMICROELECTRONICS

32 / 104 page

Satellite interface

L9663

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DocID028693 Rev 1

If a channel fault occurs, the content of every sensor buffer is affected regardless the

moment inside the timeslots cycle in which the fault occurs. This value will be held until the

fault is cleared (reading the appropriate bit in the Status Register) or a fault with higher

priority occurs.

In asynchronous communication mode a six stages FIFO is implemented: the newest data

is always in the data buffer range corresponding to sensor no. 1, the oldest data is in the

data buffer range corresponding to sensor no. 6. When the buffer is full, the FIFO shifts the

incoming data to keep always the newest data. As soon as the first data is read by SPI, the

FIFO will be locked to writing, until it is emptied(e). This situation is reported through SPI bit

FIFO_LCK.

Figure 17. Sensor buffer in asynchronous mode diagram

If a fault occurs and FIFO is unlocked, the correspondent code is written in the FIFO buffer

at the current position; if more than one fault occurs at the same time the fault with the

highest priority is written in the FIFO.

In both synchronous and asynchronous mode, when a valid data is read, the buffer empty

code 1F0 is written in the buffer.

e. For the lock of the FIFO see errata n.1526, Section 7: Errata.

Table 8. Time (t0-t7) vs SensorData

Time/Sensor

SensorData1

Buffer Empty

SensorData2

Buffer Empty

Buffer

Empty

SensorData3

Buffer Empty

Buffer

Empty

Buffer

Empty

SensorData4

Buffer Empty

Buffer

Empty

Buffer

Empty

Buffer

Empty

SensorData5

Buffer Empty

Buffer

Empty

Buffer

Empty

Buffer

Empty

Buffer

Empty

SensorData6

Buffer Empty

Buffer

Empty

Buffer

Empty

Buffer

Empty

Buffer

Empty

Buffer

Empty

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