Preliminary Datasheet
Released date: July 2004
Revision 0.9
page 10
創傑科技股份有限公司
IS1002
Integrated System Solution Corp.
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.
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