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CP3BT10G38 Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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CP3BT10G38 Datasheet(HTML) 6 Page - National Semiconductor (TI) |
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6 / 210 page  www.national.com 6 3.16 ACCESS.BUS INTERFACE The ACCESS.bus interface module (ACB) is a two-wire se- rial interface with the ACCESS.bus physical layer. It is also compatible with Intel’s System Management Bus (SMBus) and Philips’ I2C bus. The ACB module can be configured as a bus master or slave, and can maintain bidirectional com- munications with both multiple master and slave devices. The ACCESS.bus receiver can trigger a wake-up condition out of the low-power modes using the Multi-Input Wake-Up module. 3.17 DMA CONTROLLER The Direct Memory Access Controller (DMAC) can speed up data transfer between memory and I/O devices or be- tween two memories, relative to data transfers performed di- rectly by the CPU. A method called cycle-stealing allows the CPU and the DMAC to use the core bus in parallel. The DMAC implements four independent DMA channels. DMA requests from a primary and a secondary source are recog- nized for each DMA channel, as well as a software DMA re- quest issued directly by the CPU. Table 1 shows the DMA channel assignment on the CP3BT10 architecture. The fol- lowing on-chip modules can assert a DMA request to the DMAC: CR16C (Software DMA request) USB UART Advanced Audio Interface CVSD/PCM Converter Table 1 shows how the four DMA channels are assigned to the modules listed above. Table 1 DMA Channel Assignment 3.18 ADVANCED AUDIO INTERFACE The audio interface provides a serial synchronous, full-du- plex interface to codecs and similar serial devices. Transmit and receive paths operate asynchronously with respect to each other. Each path uses three signals for communica- tion: shift clock, frame synchronization, and data. In case receive and transmit use separate shift clocks and frame sync signals, the interface operates in its asynchro- nous mode. Alternatively, the transmit and receive path can share the same shift clock and frame sync signals for syn- chronous mode operation. The interface can handle data words of either 8- or 16-bit length and data frames can consist of up to four slots. In the normal mode of operation, the interface only transfers one word at a periodic rate. In the network mode, the inter- face transfers multiple words at a periodic rate. The periodic rate is also called a data frame and each word within one frame is called a slot. The beginning of each new data frame is marked by the frame sync signal. 3.19 CVSD/PCM CONVERSION MODULE The CVSD/PCM module performs conversion between CVSD and PCM data, in which the CVSD encoding is as de- fined in the Bluetooth specification 1.0 and the PCM data can be 8-bit µ-Law, 8-bit A-Law, or 13-bit to 16-bit Linear. 3.20 SERIAL DEBUG INTERFACE The Serial Debug Interface module (SDI module) provides a JTAG-based serial link to an external debugger, for exam- ple running on a PC. In addition, the SDI module integrates an on-chip debug module, which allows the user to set up to four hardware breakpoints on instruction execution and data transfer. The SDI module can act as a CPU bus master to access all memory mapped resources, such as RAM and peripherals. It also provides fast program download into the on-chip Flash program memory using the JTAG interface. Note: The SDI module may assert Freeze mode to gather information, which may cause periodic fluctuations in re- sponse (bus availability, interrupt latency, etc.). Anomalous behavior often may be traced to SDI activity. 3.21 DEVELOPMENT SUPPORT In addition to providing the features needed for the next gen- eration of embedded Bluetooth products, the CP3BT10 is backed up by the software resources designers need for rapid time-to-market, including an operating system, Blue- tooth protocol stack implementation, peripheral drivers, ref- erence designs, and an integrated development environment. Combined with National’s LMX5252 Bluetooth radio transceiver, the CP3BT10 provides a total Bluetooth system solution. National Semiconductor offers a complete and industry- proven application development environment for CP3BT10 applications, including the IAR Embedded Workbench, iSYSTEM winIDEA and iC3000 Active Emulator, Bluetooth Development Board, Bluetooth Protocol Stack, and Applica- tion Software. See your National Semiconductor sales rep- resentative for current information on availability and features of emulation equipment and evaluation boards. Channel Primary/ Secondary Peripheral Transaction 0 Primary USB Read/Write Secondary UART Read 1 Primary UART Write Secondary Unused N/A 2 Primary AAI Read Secondary CVSD/PCM Read 3 Primary AAI Write Secondary CVSD/PCM Write |
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