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IS1002

Bluetooth Baseband Controller

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創傑科技股份有限公司

Integrated System Solution Corp.

IS1002

Bluetooth Baseband Controller

7.8 HCI Control Logic for USB/UART:

A hardwired control logic is presented in front of the USB and UART devices for HCI

protocol handling and packet buffering. This control logic is part of the HCI controller

defined in Bluetooth specification. This logic is partially responsible for the HCI protocol

handling to/from the host and it also maps the registers of the USB and UART devices

indirectly to the 8051 such that the system can receive or send a HCI packet to/from the

respective host interface. Major functions of this logic include:

• HCI packet formatter and de-formatter (identifying the packet type)

• Frame boundary determination, segmentation and reassembly of HCI packets.

• HCI packet transmission, receiving, and buffering (using common memory HCI

buffer).

• Independent receive / transmit channels

• Universal device interface

7.9 Embedded UART:

An embedded UART (Universal Asynchronous Receiver Transmitter) is included in this

design. In order to reduce gate count, only the functions required for the HCI logic are

included. These include the following:

• Full-Duplex operation

• Programmable BAUD rate (using 16-bit input clock divider to obtain Baud Rate x16

clock base)

• 7 or 8 Data bits

• 1 or 2 Stop bits

• Even / Odd / Mark / Space / None Parity configurations

• Break Generation / Detection

• Maskable individual interrupts to CPU and combined Error interrupt to HCI

• Selectable Direct CPU interface or interface to HCI module

7.10 Voice CODEC

On the Bluetooth Specification, either a 64 kb/s log PCM format (A-Law or µ-Law) is used,

or a CVSD (Continuous Variable Slope Delta Modulation) is used. ISSC IS1090 supports

all coding schemes with conversion capabilities. In addition, the ISSC IS1090 Audio

handling section also supports simultaneous 3-SCO channel operation. An external

Codec must be added to perform the A/D and D/A functions.

Preliminary Datasheet

page 10

Released date: July 2004

Revision 0.9

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