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CS7808-CM Datasheet(PDF) 18 Page - Cirrus Logic |
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CS7808-CM Datasheet(HTML) 18 Page - Cirrus Logic |
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18 / 52 page 
CS7808 18 3. FUNCTIONAL DESCRIPTION 3.1 Block Diagram The CS7808 block diagram is shown in Figure 14. 3.2 CS7808 Device Details 3.2.1 RISC-32 Processors • Two Powerful 32-bit RISC processors (RISC0 and RISC1) • Virtual memory support • Optimizing C compiler • Big or little endian data formats support • MAC multiply/accumulate in 2 cycles with C support • 4 Kbyte instruction cache, 2 Kbyte data cache • Single cycle instructions, runs at 81 Mhz 3.2.2 Powerful 32-Bit DSP • Powerful 32/24-bit DSP processor • 24-bit fixed point logic, with 54-bit accumulator • Single-cycle throughput, 2-cycle latency multiply accumulate, 34-bit simple integer logic • 8-Kbyte instruction cache, 8-Kbyte program visible local memory • Single cycle instructions, runs at 81 Mhz 3.2.3 System Controls • Includes several hardware lockable semaphore registers • General-purpose register for inter-processor com- munication • 32-bit timers for I/O and other uses, with program- mable interval rates • Both hardware and software interrupts on data or debug RISC0 (Navigation & Control) PLL (Main, Audio, SDRAM) MPEG2 Video Decoder 2/4/8 Bit OSD Video Processor (I/O, Scale, PIP, Mix) SubPicture Decoder RISC1 (Application) AC '97 CODEC Interface PCM, SPDIF Interface AUDIO DSP DMA Control (BitBlt, CSS) Mem Control (SDRAM,ROM) Host Interface (ATAPI,AV,ISA) External IO (GPIO, IR) Registers I2C (Debug Port) Figure 14. CS7808 Block Diagram |
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