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参数资料
| 型号： | 4450HG/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： | ROHS COMPLIANT, HSBGA-324 |
| 文件页数： | 22/92页 |
| 文件大小： | 780K |
| 代理商： | 4450HG/3-K |
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4450 – Data Sheet, DS-0131-06
Page 29
Hifn Confidential
The security association database (SAD) is initialized on power up, and typically maintained
by the optional on-chip IKE firmware. For applications using host-based IKE, the host may
directly inspect and modify both inbound and outbound SAD entries via the Hifn
FlowThrough API. Refer to Hifn's FlowThrough Application Programming Interface
Programmer’s Guide, UG-0147, for more information on APIs.
5.5 Exception Handling
In the 4450, exceptions fall into three categories:
1. Packet Exceptions in the PPCI protocol (i.e. bad IP header, no SA for inbound
packet, authentication failure)
2. Management Communications Exceptions in the PPCI protocol (i.e. No ACK
received, out-of-sequence packet)
3. Chip Operation Exceptions (i.e. RAM parity error, bad Flash image, bad RNG etc.)
Generally, the Packet Exceptions are captured and processed by the IKE software. If IKE is
running on-chip, then these exceptions are internally routed to the eSC processor and dealt
with there. If IKE is running on the host system, then Packet Exceptions are encapsulated
in a special Ethernet frame and forwarded to the host.
Management communications between the host system and the 4450 are carried over a
proprietary protocol called PPCI (Packet Processing Command Interface). This protocol uses
Ethernet frames with a Hifn Ethertype of 0x814F. Any exceptions that occur within this
protocol are handled within the Hifn API code and PPCI handler through re-sends or higher-
level software interaction.
Chip Operation Exceptions may be fatal (such as a memory parity error) where the chip is
reset, or they may be recoverable with software intervention (such as a bad Flash image).
Additional information on exception handling and the PPCI protocol is available in the 44x0/
84x0 User's Manual.
5.6 System Boot
The 4450's internal processors use a small pre-boot ROM image that is resident on the
chip. These primitive instructions put the system into a state that searches for a boot
source (either a local Flash device or host interface) based on two configuration input pins.
If no external Flash is found, then the 4450 boot firmware enters a listening state, waiting
for the boot message protocol over the host-side Gigabit Ethernet port 0 or the RMII port.
The boot message protocol facilitates the rest of the boot code image downloading.
The boot code image can be located on the host, in an external Flash device, or on another
4450 device. Note that even if the device is configured to boot from Flash, a mechanism is
still provided to boot from the host in order to allow initial Flash programming or to recover
from a corrupted Flash. After the full image is downloaded, a complete system initialization
is performed and the 4450 is ready to process data.
相关PDF资料 |
PDF描述 |
|---|---|
| 4450HA/3-K | MICROPROCESSOR, PBGA324 |
| 45-21/LK2C-B56702C4CB2/2T | SINGLE COLOR LED, COOL WHITE |
| 45-21/LK2C-B38452C4CB2/2T | SINGLE COLOR LED, WARM WHITE |
| 45-21/QK2C-B45562C4CB2/2T | SINGLE COLOR LED, COOL WHITE |
| 45-21/QK2C-B56702C4CB41/2T | SINGLE COLOR LED, COOL WHITE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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