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| 型号： | IDT75T43100S66BS |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PBGA304 |
| 封装： | 31 X 31 MM, LOW PROFILE, THERMALLY ENHANCED, SBGA-304 |
| 文件页数： | 4/46页 |
| 文件大小： | 446K |
| 代理商： | IDT75T43100S66BS |
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12
IDT75T43100
Preliminary Information
IP Co-Processor 32K Entries
Commercial Temperature Ranges
Reply Width Registers (RWRs)
There are four 64-bit read/write Reply Width Registers. The four
RWRs addresses are listed in Table 2.1. Each register is divided into five
fields. There is one field assigned for each of the lookup widths as shown
inFigure2.6d. Bits[31:24]areusedfor288-bitlookups;bits[7:0]areused
for 144-bit lookups; and bits [15:8] are used for 72-bit lookups. The lower
five bits of the requested Lookup width are used to specify Index Bus bits
[19:15] for the specify Lookup operation. The other two fields are
reserved, the Reserved Bits [63:32] and [23:16] need to be written to 0's
for proper operation of the device.
Figure 2.6d — RWR Format
63
32 31
24 23
16 15
8 7
0
Re s e rv e d (1)
x288 W id th
Re s e rv e d (1)
x72 W id th
x144 W id th
D5325 tb l 04a
Table 2.1 — RWR Addresses
Request Data of Lookup
Address
Register
Bit 65
Bit 64
0000 0100
Reply Width Register 0
0
0000 0101
Reply Width Register 1
0
1
0000 0110
Reply Width Register 2
1
0
0000 0111
Reply Width Register 3
1
D5325 tbl 04b
During a Lookup operation, bits [65:64] at the Request Bus are
used to select which of the four RWRs will supply the information of the
requested Lookup to the Index Bus. Table 2.1 shows how the Reply
Width Registers are selected. In multiple width data lookup i.e., 144/
288, only the last (or least significant) word of the Lookup data is used
to define which RWR to use.
NOTE:
1. All reserved bits should be set to "0's".
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