STA2500DTR STMICROELECTRONICS [STMicroelectronics], STA2500DTR Datasheet - Page 39

• Manufacturer Part Number: STA2500DTR
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STA2500D
6.13.2
6.13.3
6.13.4
The combination of time division multiplexing and the priority mechanism avoids the
interference due to packet collision. It also allows the maximization of the 2.4 GHz ISM
bandwidth usage for both devices while preserving the quality of some critical types of link.
Algorithm 2: WLAN master
In case the STA2500D has to cooperate, in a collocated scenario, with a WLAN chip not
supporting a PTA based algorithm, it is possible to put in place a simpler mechanism.
The interface is reduced to 1 line:
Figure 14. WLAN master
When the WLAN has to operate, it alerts high the BT_RF_NOT_ALLOWED signal and the
STA2500D will not operate while this signal 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.
Algorithm 3: Bluetooth master
This algorithm represents the symmetrical case of algorithm 2. Also in this case the
interface is reduced to 1 line:
Figure 15. Bluetooth master
When the STA2500D has to operate it alerts high the WLAN_RF_NOT_ALLOWED signal
and the WLAN will not operate while this signal 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.
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.The Master role can be checked and changed at run-time by the Host
via an HCI command.
STLC2500D
STLC2500D
Doc ID 16067 Rev 1
BT_RF_NOT_ALLOWED
WLAN_RF_NOT_ALLOWED
WLAN
WLAN
General specification
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