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參數(shù)資料
| 型號： | IDT75T43100S50BS |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PBGA304 |
| 封裝： | 31 X 31 MM, LOW PROFILE, THERMALLY ENHANCED, SBGA-304 |
| 文件頁數(shù)： | 9/46頁 |
| 文件大小： | 446K |
| 代理商： | IDT75T43100S50BS |
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6.42
17
IDT75T43100
Preliminary Information
IP Co-Processor 32K Entries
Commercial Temperature Ranges
GMR and SRR Select
Table 3.1 GMR Select
(1st CLK2X rising edge)
Selected
Mode
CMD [3:0]
CMD [6:4]
SRR Selected
x72 bit
Lookup
0010
000
SRR 0
001
SRR 1
010
SRR 2
011
SRR 3
100
SRR 4
101
SRR 5
110
SRR 6
111
SRR 7
x144 bit
Lookup
0011
000
SRR 0
001
SRR 1
010
SRR 2
011
SRR 3
100
SRR 4
101
SRR 5
110
SRR 6
111
SRR 7
x288 bit
Lookup
1010
000
SRR 0
001
SRR 1
010
SRR 2
011
SRR 3
100
SRR 4
101
SRR 5
110
SRR 6
111
SRR 7
E5325 tbl 04
Table 3.2 SRR Select
(2nd CLK2X rising edge)
Selected
Mode
CMD [3:0] CMD [6:4]
GMR Selected
x72 bit
Lookup
0010
000
GMR 10 (use for Write)
001
GMR 11 (use for Write)
010
GMR 12 (use for Write)
011
GMR 13
100
GMR 14
101
GMR 15
110
GMR 16
111
No Mask
x144 bit
Lookup
0011
000
GMR 20, GMR 21
001
GMR 24, GMR 25
111
No Mask
XXX
All other bit combinations are
reserved
x288 bit
Lookup
1010
000
GMR 30, GMR 31, GMR 32, GMR 33
111
No Mask
XXX
All other bit combinations are
reserved
E5325 tbl 03a
TheCommandBusbits[6:4] areusedfortwofunctions. Onefunction
istospecifywhichGlobalMaskRegister(s) tousefortheWrite(Data/Mask)
and Lookup commands. The other function is to specify which Search
Result Register (SRR) will store the resulting Index of the search.
The Command Bus bits [6:4] are sampled on the rising edge of each
CLK2X. The Global Mask Register(s) are selected on the 1st CLK2X
cycle, followed by the Search Result Registers on the 2nd CLK2X cycle.
The Global Mask registers are used to mask out the specified bits in
theRequestBuswhenperforminglookupsandwrites. For72-bitlookups
there are 8 scenarios (7 GMRs and 1No Mask), for 144-bit lookups there
are 3 scenarios and for 288-bit lookups there are 2 scenarios available.
All writes are 72-bit only and will use GMRs 10, 11 and 12 only.
The Search Result Registers are used to store the resulting Index of
a successful lookup as specified by the Command Bus during a Lookup
command. Asubsequent IndirectWrite(orRead) commandcanspecify
whichSearchResultRegisterwillsupplytheaddressforthe(Data/Mask)
array.
GMR and SRR Select
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