SPIRIT1 datasheet(48/94 Pages) STMICROELECTRONICS

48 / 94 page

Transmission and reception

SPIRIT1

48/94

Doc ID 022758 Rev 3

When reception is aborted on timeout expiration, the packet is considered not valid and will

be discarded.

It is responsibility of the user to choose the proper boolean condition that suit its application.

In particular, it is required to include always SQI valid check, to avoid to stay in RX state for

unlimited time, if timeout is stopped but no valid SQI is detected (in such cases, the RX state

can be left using a SABORT command).

It is also important to notice that, in case a packet is received, that the timeout is stopped by

some of the conditions in order to get an RX data ready interrupt, otherwise SPIRIT1 will

wait in RX mode for the RX timeout to expire anyway.

9.4

Intermediate frequency setting

The intermediate frequency (IF) is controlled by the registers IF_OFFSET_ANA and

IF_OFFSET_DIG, and can be set as:

Equation 7

Equation 8

where fXO is the XTAL oscillator frequency (24, 25, 26, 48, 50 or 52 MHz) and fCLK is the

digital clock frequency (24, 25 or 26 MHz).

Both RSSI AND SQI above

threshold

Both RSSI AND PQI above

threshold

Both SQI AND PQI above

threshold

ALL above threshold

RSSI OR SQI above

threshold

RSSI OR PQI above

threshold

SQI OR PQI above

threshold

ANY above threshold

Table 26.

RX timeout stop condition configuration (continued)

RX_TIMEOUT_

AND_OR_SELECT

CS_TIMEOUT_MASK

SQI_TIMEOUT

_MASK

PQI_TIMEOUT_M

ASK

Description

IF_OFFSET_ANA

ROUND

---------

–

⋅⋅

⎝⎠

⎛⎞

⋅

IF_OFFSET_DIG

ROUND

CLK

-----------

–

⋅⋅

⎝⎠

⎛⎞

⋅

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