STLC2500ATR datasheet(28/37 Pages) STMICROELECTRONICS

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General specification

STLC2500A

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collision and it allows the maximization of the 2.4 GHz ISM bandwidth usage for both

devices while preserving the quality of some critical types of link.

6.11.2

Algorithm 2: WLAN master

In case the STLC2500A has to cooperate in a collocated scenario with a WLAN chip that

does not support a PTA based algorithm, a simpler mechanism can be put in place. The

interface is reduced to 1 line.

Figure 8.

ALgorithm 2: WLAN master

When the WLAN has to operate, it alerts HIGH the RF_NOT_ALLOWED signal and the

STLC2500A will not operate while this signals stays HIGH.

This mechanism permits to avoid packet collision in order to make an efficient use of the

bandwidth but cannot provide guaranteed quality over the Bluetooth links.

6.11.3

Algorithm 3: Bluetooth master

This algorithm represents the symmetrical case of

Section 6.11.2. Also in this case the

interface is reduced to 1 line.

Figure 9.

ALgorithm 3 - Bluetooth master

When the STLC2500A has to operate it alerts HIGH the RF_NOT_ALLOWED signal and

the WLAN will not operate while this signals stays HIGH.

This mechanism permits to avoid packet collision in order to make an efficient use of the

bandwidth, it provides high quality for all Bluetooth links but cannot provide guaranteed

quality over the WLAN links.

6.11.4

Algorithm 4: Two-wire mechanism

Based on algorithm 2 and 3, the Host decides, on a case-by-case basis, whether WLAN or

Bluetooth is master.

6.11.5

Algorithm 5: Alternating Wireless Medium Access (AWMA)

AWMA utilizes a portion of the WLAN beacon interval for Bluetooth operations. From a

timing perspective, the medium assignment alternates between usage following WLAN

procedures and usage following Bluetooth procedures.

The timing synchronization between the WLAN and the STLC2500A is done by the HW

signal MEDIUM_FREE.

STLC2500

WLAN

RF_NOT_ALLOWED

STLC2500

WLAN

RF_NOT_ALLOWED

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