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| 型號(hào)： | C3ENPB0-DS |
| 英文描述： | 4 Mbit (512 Kbit x 8) ZEROPOWER® SRAM |
| 中文描述： | ? - 3E的網(wǎng)絡(luò)處理器的數(shù)據(jù)資料硅修訂買0 |
| 文件頁數(shù)： | 25/114頁 |
| 文件大?。?/td> | 1893K |
| 代理商： | C3ENPB0-DS |
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Table Lookup Unit
25
MOTOROLA GENERAL BUSINESS INFORMATION
C3ENPA1-DS/D REV 03
Some of these parameters are programmed into the SDRAMs
’
mode register and can be
applied only once per power cycle. The ECC functionality can be enabled or disabled via
configuration register writes.
If needed, the interface can narrowed to 128bits by disabling ECC and providing board
pull-ups for the two control bits and nine ECC bits. This is useful if DIMMs are used in the
board design. If individual SDRAM parts are used, x16 and x32 are supported. The BMU
supports SDRAM devices that use 12 address lines. Internal address calculation paths limit
the maximum memory size to 128MBytes. Only one physical bank of SDRAM is supported.
Table Lookup Unit
The Table Lookup Unit (TLU) performs table lookups in external SRAM. It can also be used
for statistics accumulation and retrieval and as general data storage. The TLU
simultaneously supports multiple application-defined tables and multiple search
strategies, such as those needed for routing, circuit switching, and QoS lookup tasks.
The C-3e NP uses external 64bit wide ZBT Pipelined Bursting Static RAM (SRAM) modules
(at frequencies up to 125MHz) for storage of its tables. These modules allow
implementation of tables with 2
25
x 64bit entries using 8Mbit SRAM technology. The
maximum amount of memory supported by the TLU is 128MBytes in four banks, when
SRAM technology supports 4M x 18pins parts.
Table 5
TLU SRAM Configurations
SRAM TECHNOLOGY
MIN TABLE SIZE
(ONE BANK)
MAXIMUM TABLE SIZE
(FOUR BANKS)
1Mbit (32k x 32pins)
256kBytes
1MBytes
2Mbit (64k x 32pins)
512kBytes
2MBytes
4Mbit (256k x 18pins)
2MBytes
8MBytes
8Mbit (512k x 18pins)
4MBytes
16MBytes
16Mbit (1M x 18pins)
8MBytes
32MBytes
32Mbit (2M x 18pins)
16MBytes
64MBytes
64Mbit (4M x 18pins)
32MBytes
128MBytes
F
n
.
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