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参数资料
| 型号： | 4450HA/3-K |
| 厂商： | EXAR CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | MICROPROCESSOR, PBGA324 |
| 封装： | HSBGA-324 |
| 文件页数： | 19/92页 |
| 文件大小： | 780K |
| 代理商： | 4450HA/3-K |
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4450 – Data Sheet, DS-0131-06
Page 26
Hifn Confidential
4.3 Public Key Processing
The 4450 Public Key processing includes the eSC embedded processor and efficient Public
Key acceleration hardware. To optimize the public key acceleration, the Public Key
processor is equipped with dedicated OpCode-based exponentiation hardware. The Public
Key processor operates on a batch of modular arithmetic instructions. Since each modular
arithmetic instruction (nano instruction) execution is eSC independent, the eSC is only
required to setup the Public Key engine with operands, issue instructions, and retrieve the
result upon completion of Public Key processing.
4.4 Clock Domains
The 4450 has separate clock domains for the GMAC interfaces, the internal packet
processing units, and the external SDRAM interfaces. The GMII/MII interfaces run at 125/
25/2.5 MHz (corresponding to 1G, 100M or 10M interface speeds), the packet processing
units run at 200MHz, and the SDRAM interfaces run at 200MHz.
The clock domains are controlled by a clock generation PLL, whose reference clock input is
either single-ended (prefclk) or differential (srefclk_p, srefclk_n). When in Serdes or SGMII
mode, the reference clock for the clock generation PLL must be the differential clock input
driven at a frequency of 125MHz. When the Serdes/SGMII interface is not being used, the
reference clock for the clock generation PLL is the single-ended clock input. The single-
ended PLL reference input can be either 25MHz or 125MHz, selected by the pll_mode[1]
select pin. With either input frequency, the appropriate clocks will be generated to support
10/100/1000 speeds assuming Serdes/SGMII mode is not selected. If Serdes (and/or TBI/
RTBI) mode is selected for a given interface, operation is limited to 1G speed only for that
interface.
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相关代理商/技术参数 |
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| 445-0X | 制造商:APEX 功能描述:TOOLS, HEX BITS; Bit Type:Slotted; Hex Bit Size:3F-4R; Length:25mm; Size:1" ;RoHS Compliant: NA |
| 4451 | 功能描述:电缆固定件和配件 PG 7 HYBRID CG .87X.59 .12-.28 RoHS:否 制造商:Heyco 类型:Cable Grips, Liquid Tight 材料:Nylon 颜色:Black 安装方法:Cable 最大光束直径:11.4 mm 抗拉强度: |
| 44510 | 功能描述:钳子和镊子 ESD Safe Tweezers 7a SA - 120mm RoHS:否 制造商:OK Industries 大小: 类型:Insertion/Extraction Tools And Kit |
| 44-510 | 制造商:RAWLPLUG 功能描述:RAWLBOLT PROJECTING M625P |
| 445100170 | 制造商:OMRON AUTOMATION AND SAFETY 功能描述:SR10 24VAC/DC OR 110/220VAC |
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