Host card type-a function, Type-b function, 3 type-a card and type-b card – SDI Technologies SDIO Card User Manual

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SDIO Card Bluetooth Type-A Simplified Specification Version 1.00

1.3 Type-A Card and Type-B Card

An SDIO Card for Bluetooth provides Bluetooth wireless technology in the form of SD Card dimensions.
The SDIO Card Type-A Specification for Bluetooth provides a uniform interface for accessing an SDIO
Card Type-A for Bluetooth. This interface enables the Host and the Card to execute Bluetooth protocols
cooperatively in such a way that some layers reside in the Host and the rest in the Card. It defines the
service provided by the Bluetooth protocol layers that reside in the Card, and the data transport
mechanism over SDIO.

These slim cards come with two different implementations to cater to various kinds of appliances. The
Type-A implementation is meant for appliances like PDAs or notebook computers that have sufficient
processing resources and are easily re-configurable. The Type-B implementation is intended for
appliances that have very limited processing resources or are difficult to re-configure, such as audio
players, video viewers and Digital Still Cameras (DSC).

Figure 3 shows a conceptual view of the Type-A function and the Type-B function. The Type-A
implementation consists of only the Radio, Baseband and the SDIO interface. The remaining Bluetooth
protocol layers and profiles reside in the Host. The Type-B implementation consists of those modules
found in Type-A implementation plus additional upper Bluetooth protocol layers such as L2CAP, SDP
and RFCOMM.

Figure 3 – Conceptual View of Type-A Function and Type-B Function

Antenna

Bluetooth Module

Upper Layer

Protocol Stacks

and Profiles

SDIO

Host

Card

Type-A

Function

Baseband LSI

Radio LSI

Bluetooth Module

Protocol Layers

& Profiles