 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
IDT79RV4650-100DPI Datasheet(PDF) 3 Page - Integrated Device Technology |
|
||||||||||||||||||||||||||||||
IDT79RV4650-100DPI Datasheet(HTML) 3 Page - Integrated Device Technology |
|
|
3 / 25 page  3 of 25 March 28, 2000 IDT79RC4650™ ,QWHJHU#([HFXWLRQ#(QJLQH ,QWHJHU#([HFXWLRQ#(QJLQH ,QWHJHU#([HFXWLRQ#(QJLQH ,QWHJHU#([HFXWLRQ#(QJLQH The RC4650 implements the MIPS-III Instruction Set Architecture and is upwardly compatible with applications that run on the earlier generation parts. The RC4650 includes the same additions to the instruction set found in the RC4700 family of microprocessors, targeted at improving performance and capability while maintaining binary compatibility with earlier RC3000 processors. The extensions result in better code density, greater multi-processing support, improved performance for commonly used code sequences in operating system kernels, and faster execution of floating-point intensive applications. All resource dependencies are made transparent to the programmer, insuring transportability among implementations of the MIPS instruction set architecture. In addition, MIPS-III specifies new instructions defined to take advantage of the 64-bit architecture of the processor. Finally, the RC4650 also implements additional instructions, which are considered extensions to the MIPS-III architecture. These instruc- tions improve the multiply and multiply-add throughput of the CPU, making it well suited to a wide variety of imaging and DSP applications. These extensions, which use opcodes allocated by MIPS Technologies for this purpose, are supported by a wide variety of development tools. The MIPS integer unit implements a load/store architecture with single cycle ALU operations (logical, shift, add, sub) and autonomous multiply/divide unit. The 64-bit register resources include: 32 general- purpose orthogonal integer registers, the HI/LO result registers for the integer multiply/divide unit, and the program counter. In addition, the on- chip floating-point co-processor adds 32 floating-point registers, and a floating-point control/status register. 5HJLVWHU#)LOH 5HJLVWHU#)LOH 5HJLVWHU#)LOH 5HJLVWHU#)LOH The RC4650 has thirty-two general-purpose 64-bit registers. These registers are used for scalar integer operations and address calculation. The register file consists of two read ports and one write port and is fully bypassed to minimize operation latency in the pipeline. Figure 1 illus- trates the RC4650 Register File. $/8 $/8 $/8 $/8 The RC4650 ALU consists of the integer adder and logic unit. The adder performs address calculations in addition to arithmetic operations, and the logic unit performs all logical and shift operations. Each of these units is highly optimized and can perform an operation in a single pipe- line cycle. ,QWHJHU#0XOWLSO\2'LYLGH ,QWHJHU#0XOWLSO\2'LYLGH ,QWHJHU#0XOWLSO\2'LYLGH ,QWHJHU#0XOWLSO\2'LYLGH The RC4650 uses a dedicated integer multiply/divide unit, optimized for high-speed multiply and multiply-accumulate operation. Table 1 shows the performance, expressed in terms of pipeline clocks, achieved by the RC4650 integer multiply unit. The MIPS-III architecture defines that the results of a multiply or divide operation are placed in the HI and LO registers. The values can then be transferred to the general purpose register file using the MFHI/ MFLO instructions. The RC4650 adds a new multiply instruction, “MUL”, which can specify that the multiply results bypass the “Lo” register and are placed immediately in the primary register file. By avoiding the explicit “Move- from-Lo” instruction required when using “Lo”, throughput of multiply- intensive operations is increased. An additional enhancement offered by the RC4650 is an atomic “multiply-add” operation, MAD, used to perform multiply-accumulate operations. This instruction multiplies two numbers and adds the product to the current contents of the HI and LO registers. This operation is used in numerous DSP algorithms, and allows the RC4650 to cost reduce systems requiring a mix of DSP and control functions. Finally, aggressive implementation techniques feature low latency for these operations along with pipelining to allow new operations to be issued before a previous one has fully completed. Table 1 also shows the repeat rate (peak issue rate), latency, and number of processor stalls required for the various operations. The RC4650 performs automatic operand size detection to determine the size of the operand, and imple- ments hardware interlocks to prevent overrun, allowing this high-perfor- mance to be achieved with simple programming. )ORDWLQJ03RLQW#&R03URFHVVRU )ORDWLQJ03RLQW#&R03URFHVVRU )ORDWLQJ03RLQW#&R03URFHVVRU )ORDWLQJ03RLQW#&R03URFHVVRU The RC4650 incorporates an entire single-precision floating-point co- processor on chip, including a floating-point register file and execution units. The floating-point co-processor forms a “seamless” interface with the integer unit, decoding and executing instructions in parallel with the integer unit. The RC4650’s floating-point unit directly implements single-precision floating-point operations. This enables the RC4650 to perform functions such as graphics rendering, without requiring extensive die are or power consumption. The RC4650 does not directly implement the double-precision opera- tions found in the RC64475. However, to maintain software compatibility, 2SFRGH 2SHUDQG# 6L]H /DWHQF\ 5HSHDW 6WDOO MULT/U, MAD/U 16 bit 3 2 0 32 bit 4 3 0 MUL 16 bit 3 2 1 32 bit 4 3 2 DMULT, DMULTU any 6 5 0 DIV, DIVU any 36 36 0 DDIV, DDIVU any 68 68 0 Table 1 RC4650 Integer Multiply Operation |
Similar Part No. - IDT79RV4650-100DPI |
|
Similar Description - IDT79RV4650-100DPI |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
