CC2564MODN Datasheet, PDF (20/62 Pages) Texas Instruments – Bluetooth Host Controller Interface (HCI) Module

CC2564MODN, CC2564MODA
SWRS160D – FEBRUARY 2014 – REVISED DECEMBER 2015
www.ti.com
Figure 5-4 shows UART Transport Layer.
Host
Host_RX
Host_TX
Host_CTS
Host_RTS
HCI_RX
HCI_TX
HCI_CTS
HCI_RTS
CC2564MODx
Figure 5-4. UART Transport Layer
When the UART RX buffer of the TI Bluetooth HCI module passes the flow control threshold, it sets the
HCI_RTS signal high to stop transmission from the host.
When the HCI_CTS signal is set high, the module stops transmission on the interface. If HCI_CTS is set
high while transmitting a byte, the module finishes transmitting the byte and stops the transmission.
The UART Transport Layer includes a mechanism that handles the transition between active mode and
sleep mode. The protocol occurs through the CTS and RTS UART lines and is known as the enhanced
HCI low level (eHCILL) power-management protocol.
For more information on the UART Transport Layer, see Volume 4 Host Controller Interface, Part A UART
Transport Layer of the Bluetooth Core Specifications (www.bluetooth.org/en-
us/specification/adoptedspecifications).
5.7.2 Three-Wire UART Transport Layer
The Three-wire UART Transport Layer consists of three signals (see Figure 5-5):
• TX
• RX
• GND
Host
Host_RX
Host_TX
GND
HCI_RX
HCI_TX
GND
CC2564MODx
Figure 5-5. Three-Wire UART Transport Layer
The Three-Wire UART Transport Layer supports the following features:
• Software flow control (XON/XOFF)
• Power management using the software messages:
– WAKEUP
– WOKEN
– SLEEP
• CRC data integrity check
For more information on the Three-Wire UART Transport Layer, see Volume 4 Host Controller Interface,
Part D Three- Wire UART Transport Layer of the Bluetooth Core Specifications (www.bluetooth.org/en-
us/specification/adoptedspecifications).
5.8 Digital Codec Interface
The codec interface is a fully programmable port to support seamless interfacing with different PCM and
I2S codec devices. The interface includes the following features:
• Two voice channels
• Master and slave modes
• All voice coding schemes defined by the Bluetooth specification: linear, A-Law, and μ-Law
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Detailed Description
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