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参数资料
| 型号： | VMS115 |
| 元件分类： | 加密电路 |
| 英文描述： | TELECOM, DATA ENCRYPTION CIRCUIT, PQFP100 |
| 封装： | MQFP-100 |
| 文件页数： | 45/64页 |
| 文件大小： | 572K |
| 代理商： | VMS115 |
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VLSI Technology, a subsidiary of Philips Semiconductors
8/10/99
5
Revision: 2.3
906
Data Sheet
IPSec processing only. The order is significant, as the more dynamic elements are listed first and
those elements expected to change less frequently are listed later. A context write will flush all
previous states of the IPSec processor. A context write does not overwrite the entire context area,
thus it’s only necessary to modify those elements in the context that have actually changed since
the previous write.
The Context Read/Write Pointer Registers are used by the VMS115 to determine the location
within the context block for read and write accesses. The context pointers point to the word (4
bytes) of data that will be read or written for a context access. The Context Read/Write Pointer
registers are reset to the first location (zero) under the following conditions:
Read Pointer Reset Conditions:
1. Any packet data access (read or write).
2. A change from context write to context read.
3. Soft Reset
4. Chip Reset
Write Pointer Reset Conditions:
1. Any packet data access (read or write).
2. A change from context read to context write.
3. Soft Reset
4. Chip Reset
The context pointers may be directly accessed through the VMS115 memory space by the exter-
nal processor and they may be set to any value via this interface. A context data read results in 20
bytes of Hash Digest being added to the beginning of the context data. The Hash Digest is stored
in the Context Buffer such that the beginning of the digest (first word) is at the beginning of the
Context.
Separate pointer registers exist for read (Context Read Pointer Register) and writes (Context
Write Pointer Register). Each can be accessed and set separately by the external processor.
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