User's Manual

Table Of Contents

UniStone

Interfaces

Product Overview 15 T3130-8XV10PO5-7600, 2007-01-31

3 Interfaces

3.1 HCI / UART Interface

The HCI/UART interface is the main communication interface between the host and

UniStone. The standard HCI commands are supported together with an Infineon specific

set of commands called HCI+.

The interface consists of four UART signals and two wake-up signals as shown in

Figure 3-1. Depending on which HCI transport layer that is used, some or all of the

signals are needed.

3.1.1 Supported Transport Layers

UniStone supports the HCI Three-Wire UART transport layer and two derivatives of the

HCI UART transport layer (HCI UART-4W and HCI-UART-6W) where the only difference

is how low power modes are handled. UniStone automatically detects which transport

layer that is used by the host.

3.1.2 UART

The on-chip UART (Universal Asynchronous Receiver and Transmitter) is compatible

with standard UARTs and is optimized for Bluetooth communication. Hardware support

for SLIP

framing and 16-bit CRC calculation enhances performance with the HCI

Three-Wire UART transport layer. A separate supply voltage, VDDUART, makes it easy

to connect the UART interface to any system.

See http://www.ietf.org/rfc/rfc1055.txt for information about SLIP.

Figure 3-1 HCI/UART Interface

UARTTXD

UARTRXD

UARTRTS

UARTCTS

WAKEUP_BT