Functional Description; Block Diagram; Cs98000 Device Details; Risc-32 - Cirrus Logic Crystal CS98000 Series Manual

3. FUNCTIONAL DESCRIPTION

3.1

Block Diagram

The CS98000 block is shown in Figure 8.
3.2

CS98000 Device Details

3.2.1

RISC-32

• Powerful 32-bit RISC processor
• Virtual memory support
• Optimizing C compiler and source level debug-
ger
• 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.
10
RISC-1
Instruction Data
Cache Cache
MMU MAC
MPEG Decoder
VLC Parser IDCT
Motion
RAM
Comp
System Sync
STC Interrupts
External Interface
Serial Interface
Programmable I/O
Infrared Input
DVD
ATAPI / LBUS Interface
Figure 8. CS98000 Block Diagram
3.2.2

DSP-32

• Powerful 24/32 bit DSP processor
• 24 bit fixed point logic, with 54 bit accumula-
tor.
• Single-cycle throughput, 2 cycle latency multi-
ply accumulate, 32 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

• Include several hardware lockable semaphore
registers
• General-purpose register for inter-processor
communication
• 32-bit timers for I/O and other uses, with pro-
grammable interval rates
RISC-2
Instruction Data
Cache Cache
MMU MAC
System Controls
Registers
Instruction
Cache
PLL
Subpicture Decoder
Dataflow Engine
Decoder
DMA / BitBlit
Video Processor
SRAM Buffer
On-Screen Display
Picture-in-Picture
Memory Controller
Video / Graphics Display
SDRAM Control
FLASH Control
Filter
Audio Interface
PCM Out
PCM In
SPDIF Out
DSP
X,Y Data
Memory
CPU / MAC
Scaler
Video Input
Scaler
CS98000
DS525PP1