參數(shù)資料
型號: EP20K100QC240-1
英文描述: Field Programmable Gate Array (FPGA)
中文描述: 現(xiàn)場可編程門陣列(FPGA)
文件頁數(shù): 43/114頁
文件大?。?/td> 1623K
代理商: EP20K100QC240-1
34
Altera Corporation
APEX 20K Programmable Logic Device Family Data Sheet
Single-Port Mode
The APEX 20K ESB also supports a single-port mode, which is used when
simultaneous reads and writes are not required. See Figure 22.
Figure 22. ESB in Single-Port Mode
Notes:
(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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