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參數(shù)資料
| 型號： | 9248DF-39 |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 150 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封裝： | 0.300 INCH, SSOP-48 |
| 文件頁數(shù)： | 4/18頁 |
| 文件大?。?/td> | 321K |
| 代理商： | 9248DF-39 |
12
ICS9248-39
CPU_STOP# Timing Diagram
CPU_STOP# is an asychronous input to the clock synthesizer. It is used to turn off the CPU clocks for low power operation.
CPU_STOP# is synchronized by the ICS9248-39. The minimum that the CPU clock is enabled (CPU_STOP# high pulse) is
100 CPU clocks. All other clocks will continue to run while the CPU clocks are disabled. The CPU clocks will always be stopped
in a low state and start in such a manner that guarantees the high pulse width is a full pulse. CPU clock on latency is less than
4 CPU clocks and CPU clock off latency is less than 4 CPU clocks.
Notes:
1. All timing is referenced to the internal CPU clock.
2. CPU_STOP# is an asynchronous input and metastable conditions may exist. This signal is synchronized
to the CPU clocks inside the ICS9248-39.
3. IOAPIC output is Stopped Glitch Free by CPUSTOP# going low.
4. SDRAM-F output is controlled by Buffer in signal, not affected by the ICS9248-39
CPU_STOP# signal. SDRAM (0:11) are controlled as shown.
5. All other clocks continue to run undisturbed.
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