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1. Describe
The RC64474 and RC64475 are high performance 64-bit microprocessors for applications requiring high bandwidth, real-time response, and fast data processing, ideal for products ranging from interconnected networking equipment (switches, routers) to multimedia web browsers, set-top boxes, video Systems such as games and Windows® CE-based products. These processors are rated at 330 Dhrystone MIPS, 125 million floating-point operations per second, and 250 MHz. The internal cache bandwidth of these devices exceeds 3GB/sec. The 64-bit external bus bandwidth is above 1000MB/s, and the 32-bit external bus bandwidth is 500MB/s. Packaged in a 128-pin QFP package with a 32-bit external bus, the RC64474 offers the ideal combination of 64-bit processing power and a 32-bit low-cost memory system. The RC64475 is available in a 208-pin QFP package and uses a full 64-bit external bus. The RC64475 is ideal for applications requiring 64-bit performance and 64-bit external bandwidth.
2. Features
1. High performance 64-bit microprocessor, based on the RISCore4000
– Minimized branch and load delays, through streamlined 5-stage scalar pipeline.
– Single and double precision floating-point unit
– 125 peak MFLOP/s at 250 MHz
– 330 Dhrystone MIPS at 250 MHz
– Flexible RC4700-compatible MMU
– Joint TLB on-chip, for virtual-to-physical address mapping
2. On-chip two-way set associative caches
– 16KB instruction cache (I-cache)
– 16KB data cache (D-cache)
3. Optional I-cache and D-cache locking (per set), provides improved real-time support
4. Enhanced, flexible bus interface allows simple, low-cost design
– 64-bit Bus Interface option, 1000MB/s bandwidth support
– 32-bit Bus Interface option, 500MB/s bandwidth support
– SDRAM timing protocol, through delayed data in write cycles
– RC4000/RC5000 family bus-protocol compatibility
– Bus runs at fraction of pipeline clock (1/2 to 1/8)
5. Implements MIPS-III Instruction Set Architecture (ISA)
6. 3.3V core with 3.3V I/O
7. Software compatible with entire RISController Series of Embedded Microprocessors
8. Industrial temperature range support
9. Active power management
– Powers down inactive units, through sleep-mode feature
10. 100% pin compatibility between RC64574, RC64474 and RC4640
11. 100% pin compatibility between RC64575, RC64475 and RC4650
12. RC64474 available in 128-pin QFP package, for 32-bit only systems
13. RC64475 available in 208-pin QFP package, for full 64/32 bit systems
14. Simplified board-level testing, through full Joint Test Action Group (JTAG) boundary scan
15. Windows® CE compliant
