sta2416 STMicroelectronics, sta2416 Datasheet - Page 27

• Manufacturer Part Number: sta2416
• Description: Bluetooth?? Baseband With Integrated Flash
• Manufacturer: STMicroelectronics

STA2416
5.12.1
5.12.2
Algorithm 1: packet traffic arbitration (PTA)
Algorithm 1 is based on a bus connection between the STA2416 and the WLAN chip.
Figure 7.
By using this coexistence interface it's possible to dynamically allocate bandwidth to the two
devices when simultaneous operations are required while the full bandwidth can be
allocated to one of them in case the other one does not require activity. The algorithm
involves a priority mechanism, which allows preserving the quality of certain types of link. A
typical application would be to guarantee optimal quality to the Bluetooth
communication while an intensive WLAN communication is ongoing.
Several algorithms have been implemented in order to provide a maximum of flexibility and
efficiency for the priority handling. Those algorithms can be activated via specific HCI
commands.
The combination of a time division multiplexing techniques to share the bandwidth in case of
simultaneous operations and of the priority mechanism avoid the interference due to packet
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.
Algorithm 2: WLAN master
In case the STA2416 has to cooperate, in a collocated scenario, with a WLAN chip not
supporting a PTA based algorithm, it's possible to put in place a simpler mechanism.
The interface is reduced to 1 line.
Figure 8.
When the WLAN has to operate, it alerts HIGH the RF_NOT_ALLOWED signal and the
STA2416 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
Algorithm 1: PTA
Algorithm 2: WLAN master
STA2416
STA2416
RF_NOT_ALLOWED
D05AU1626
D05AU1628
WLAN
WLAN
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General specification
links.
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