参数资料
型号: EP20K100E
厂商: Altera Corporation
英文描述: Programmable Logic Device Family
中文描述: 可编程逻辑器件系列
文件页数: 32/117页
文件大小: 570K
代理商: EP20K100E
32
Altera Corporation
APEX 20K Programmable Logic Device Family Data Sheet
Read/Write Clock Mode
The read/write clock mode contains two clocks. One clock controls all
registers associated with writing: data input,
WE
, and write address. The
other clock controls all registers associated with reading: read enable
(
RE)
, read address, and data output. The ESB also supports clock enable
and asynchronous clear signals; these signals also control the read and
write registers independently. Read/write clock mode is commonly used
for applications where reads and writes occur at different system
frequencies.
Figure 20
shows the ESB in read/write clock mode.
Figure 20. ESB in Read/Write Clock Mode
Dedicated Inputs &
Global Signals
Note (1)
Notes to
Figure 20
:
(1)
All registers can be cleared asynchronously by ESB local interconnect signals, global signals, or the chip-wide reset.
(2)
APEX 20KE devices have four dedicated clocks.
Dedicated Clocks
2 or 4
(2)
4
D
ENA
Q
D
ENA
Q
D
ENA
Q
D
ENA
Q
D
ENA
Q
data[ ]
rdaddress[ ]
wraddress[ ]
RAM/ROM
128
×
16
256
×
8
512
×
4
1,024
×
2
2,048
×
1
Data In
Read Address
Write Address
Read Enable
Write Enable
Data Out
outclocken
inclocken
inclock
outclock
D
ENA
Q
Write
Pulse
Generator
rden
wren
To MegaLAB,
FastTrack &
Local
Interconnect
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