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參數(shù)資料
| 型號： | PC755CVGHU366LE |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | PowerPC 755/745 RISC Microprocessor |
| 中文描述： | 32-BIT, 366 MHz, RISC PROCESSOR, CBGA360 |
| 封裝： | HITCE, CERAMIC, BGA-360 |
| 文件頁數(shù)： | 22/50頁 |
| 文件大?。?/td> | 1064K |
| 代理商： | PC755CVGHU366LE |
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PC755/745
2138D–HIREL–06/03
Though the die junction-to-ambient and the heat sink-to-ambient thermal resistances
are a common figure-of-merit used for comparing the thermal performance of various
microelectronic packaging technologies, one should exercise caution when only using
this metric in determining thermal management because no single parameter can ade-
quately describe three-dimensional heat flow. The final die-junction operating
temperature, is not only a function of the component-level thermal resistance, but the
system-level design and its operating conditions. In addition to the component’s power
consumption, a number of factors affect the final operating die-junction temperature —
airflow, board population (local heat flux of adjacent components), heat sink efficiency,
heat sink attach, heat sink placement, next-level interconnect technology, system air
temperature rise, altitude, etc.
Due to the complexity and the many variations of system-level boundary conditions for
today’s microelectronic equipment, the combined effects of the heat transfer mecha-
nisms (radiation, convection and conduction) may vary widely. For these reasons, we
recommend using conjugate heat transfer models for the board, as well as, system-level
designs. To expedite system-level thermal analysis, several “compact” thermal-package
models are available within FLOTHERM
. These are available upon request.
Power consideration
Power management
The PC755 provides four power modes, selectable by setting the appropriate control
bits in the MSR and HIDO registers. The four power modes are as follows:
Full-power: This is the default power state of the PC755. The PC755 is fully
powered and the internal functional units operate at the full processor clock speed.
If the dynamic power management mode is enabled, functional units that are idle
will automatically enter a low-power state without affecting performance, software
execution, or external hardware.
Doze: All the functional units of the PC755 are disabled except for the time
base/decrementer registers and the bus snooping logic. When the processor is in
doze mode, an external asynchronous interrupt, a system management interrupt, a
decrementer exception, a hard or soft reset, or machine check brings the PC755
into the full-power state. The PC755 in doze mode maintains the PLL in a fully
powered state and locked to the system external clock input (SYSCLK) so a
transition to the full-power state takes only a few processor clock cycles.
Nap: The nap mode further reduces power consumption by disabling bus snooping,
leaving only the time base register and the PLL in a powered state. The PC755
returns to the full-power state upon receipt of an external asynchronous interrupt, a
system management interrupt, a decrementer exception, a hard or soft reset, or a
machine check input (MCP). A return to full-power state from a nap state takes only
a few processor clock cycles. When the processor is in nap mode, if QACK is
negated, the processor is put in doze mode to support snooping.
Sleep: Sleep mode minimizes power consumption by disabling all internal functional
units, after which external system logic may disable the PPL and SUSCLK.
Returning the PC755 to the full-power state requires the enabling of the PPL and
SYSCLK, followed by the assertion of an external asynchronous interrupt, a system
management interrupt, a hard or soft reset, or a machine check input (MCP) signal
after the time required to relock the PPL.
相關(guān)PDF資料 |
PDF描述 |
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| PC755CMZFU300LE | PowerPC 755/745 RISC Microprocessor |
| PC755CVGSU300LE | PowerPC 755/745 RISC Microprocessor |
| PC755CVGSU350LE | PowerPC 755/745 RISC Microprocessor |
| PC755CVGSU366LE | PowerPC 755/745 RISC Microprocessor |
| PC755CVGSU400LE | PowerPC 755/745 RISC Microprocessor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PC755CVGHU400LE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:PowerPC 755/745 RISC Microprocessor |
| PC755CVGSU300LE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:PowerPC 755/745 RISC Microprocessor |
| PC755CVGSU350LE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:PowerPC 755/745 RISC Microprocessor |
| PC755CVGSU366LE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:PowerPC 755/745 RISC Microprocessor |
| PC755CVGSU400LE | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:PowerPC 755/745 RISC Microprocessor |
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