Notes to Figure 22: (1) " />
參數(shù)資料
型號(hào): EP20K300EFC672-2N
廠商: Altera
文件頁數(shù): 46/117頁
文件大?。?/td> 0K
描述: IC APEX 20KE FPGA 300K 672-FBGA
產(chǎn)品培訓(xùn)模塊: Three Reasons to Use FPGA's in Industrial Designs
標(biāo)準(zhǔn)包裝: 40
系列: APEX-20K®
LAB/CLB數(shù): 1152
邏輯元件/單元數(shù): 11520
RAM 位總計(jì): 147456
輸入/輸出數(shù): 408
門數(shù): 728000
電源電壓: 1.71 V ~ 1.89 V
安裝類型: 表面貼裝
工作溫度: 0°C ~ 85°C
封裝/外殼: 672-BBGA
供應(yīng)商設(shè)備封裝: 672-BGA(27x27)
34
Altera Corporation
APEX 20K Programmable Logic Device Family Data Sheet
Figure 22. ESB in Single-Port Mode
Notes to Figure 22:
(1)
All registers can be asynchronously cleared by ESB local interconnect signals, global signals, or the chip-wide reset.
(2)
APEX 20KE devices have four dedicated clocks.
Content-Addressable Memory
In APEX 20KE devices, the ESB can implement CAM. CAM can be
thought of as the inverse of RAM. When read, RAM outputs the data for
a given address. Conversely, CAM outputs an address for a given data
word. For example, if the data FA12 is stored in address 14, the CAM
outputs 14 when FA12 is driven into it.
CAM is used for high-speed search operations. When searching for data
within a RAM block, the search is performed serially. Thus, finding a
particular data word can take many cycles. CAM searches all addresses in
parallel and outputs the address storing a particular word. When a match
is found, a match flag is set high. Figure 23 shows the CAM block
diagram.
Dedicated Clocks
2 or 4
4
D
ENA
Q
D
ENA
Q
D
ENA
Q
D
ENA
Q
data[ ]
address[ ]
RAM/ROM
128
× 16
256
× 8
512
× 4
1,024
× 2
2,048
× 1
Data In
Address
Write Enable
Data Out
outclken
inclken
inclock
outclock
Write
Pulse
Generator
wren
Dedicated Inputs &
Global Signals
to MegaLAB,
FastTrack &
Local
Interconnect
(2)
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