TMS320VC5409 Fixed-Point Digital Signal ... - Texas Instruments

Functional Overview3.3.2 Multichannel Buffered Serial Ports (McBSPs)The 5409 device has three high-speed, full-duplex multichannel buffered serial ports (McBSPs) that allowdirect interface to other C54x/LC54x devices, codecs, and other devices in a system. The McBSPs are basedon the standard serial port interface found on other 54x devices. Like its predecessors, the McBSP provides:• Full-duplex communication• Double-buffer data registers, which allow a continuous data stream• Independent framing and clocking for receive and transmitIn addition, the McBSP has the following capabilities:• Direct interface to:− T1/E1 framers− MVIP switching-compatible and ST-BUS compliant devices− IOM-2 compliant devices− AC97-compliant devices− Serial peripheral interface (SPI) devices• Multichannel transmit and receive of up to 32 channels in a 128 channel stream.• A wide selection of data sizes including 8, 12, 16, 20, 24, or 32 bits• µ-law and A-law companding• Programmable polarity for both frame synchronization and data clocks• Programmable internal clock and frame generationFor detailed information on the standard features of the McBSP, refer to the TMS320C54x DSP ReferenceSet, Volume 5: Enhanced Peripherals, (literature number SPRU302).Although the BCLKS pin is not available on the 5409 PGE and GGU packages, the 5409 is capable ofsynchronization to external clock sources. BCLKX or BCLKR can be used by the sample rate generator forexternal synchronization. The sample rate clock mode extended (SCLKME) bit field is located in the PCR toaccommodate this option.15 14 13 12 11 10 9 8Reserved XIOEN RIOEN FSXM FSRM CLKXM CLKRMRW RW RW RW RW RW RW7 6 5 4 3 2 1 0SCLKME CLKS STAT DX STAT DR STAT FSXP FSRP CLKXP CLKRPRW RW RW RW RW RW RW RWLEGEND: R = Read, W = WriteFigure 3−8. Pin Control Register (PCR)32 SPRS082FApril 1999 − Revised October 2008