參數(shù)資料
型號(hào): M7A3PE600-FFG256I
元件分類: FPGA
英文描述: FPGA, 600000 GATES, PBGA256
封裝: 1 MM PITCH, FBGA-256
文件頁數(shù): 121/168頁
文件大?。?/td> 1335K
代理商: M7A3PE600-FFG256I
ProASIC3E Flash Family FPGAs
2- 44
Advanced v0.5
At the system level, the skew circuit can be used in applications where transmission activities on bidirectional data
lines need to be coordinated. This circuit, when selected, provides a timing margin that can prevent bus contention
and subsequent data loss and/or transmitter over-stress due to transmitter-to-transmitter current shorts. Figure 2-33
presents an example of the skew circuit implementation in a bidirectional communication system. Figure 2-34 shows
how bus contention is created, and Figure 2-35 on page 2-45 shows how it can be avoided with the skew circuit.
Figure 2-33 Example of Implementation of Skew Circuits in Bidirectional Transmission Systems Using ProASIC3E Devices
Figure 2-34 Timing Diagram (Bypasses Skew Circuit)
Transmitter 1: ProASIC3E I/O
Transmitter 2: Generic I/O
ENABLE (t2)
EN (b1)
EN (b2)
Routing
Delay (t1)
Routing
Delay (t2)
EN (r1)
ENABLE (t1)
Skew or
Bypass
Skew
Bidirectional Data Bus
Transmitter
ENABLE/
DISABLE
EN (b1)
EN (b2)
ENABLE (r1)
Transmitter 1: ON
ENABLE (t2)
Transmitter 2: ON
ENABLE (t1)
Bus
Contention
Transmitter 1: OFF
Transmitter 2: OFF
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