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PCIe approach of FL1100 and Asmedia 1142

2017.05.18 15:58

[레벨:12]뉴해킨 조회 수:1423

Fresco FL1100 pci information


Screen Shot 2017-05-17 at 5.11.36 PM.png


Asmedia 1142 usb 3.1 pc information


Screen Shot 2017-05-17 at 5.11.17 PM.png

It's very useful to understand what GT/s really means in terms of Gigabits per second of computable data. Converting GT/s to Gbps is easy and mechanics involved become more clear. To understand this, we need to know PCI_E specification.

pcie 1.0 2.5 GT/s

pcie 2.0  5   GT/s

pcie 3.0  8   GT/s

PCI express performances are always expressed in GT/s while external device performances like usb devices, instead, are expressed in Gbps. One more thins to remember is that bandwidth of pcie device is decided by Link speed x Link Width. For instance, in the above example, asmedia 1142 can handle up to 5.0 GT/s x 2 = 10 GT/s per card.


Here is how convert GT/s to Gbps, bandwidth x PCIe encoding scheme because the encoding creates overhead during data transfer. 

i) PCIe encoding schem for PCIe 1.0 is 1  

   2.5 GT/s  x 1b/1b = 2.5 Gbps.

ii) PCIe encoding schem for PCIe 2.0 is. 8 bits/10 bits  ( 10 bis to encode 8 bits of data )

   5.0 GT/s x 8b/10b = 4Gbps ~ 500 MBs

iii) PCIe encoding schem for PCIe 3.0 is 128b/130b

   8.0 GT/s x 128b/130b = 7.87 Gbps ~ 984.6 MBps


Let's find out Fresco FL1100 and as media 1142.


1) Fresco FL1100

This chip use PCI2 x1 gen2 and can handle 5Gps per port according to datas heet. As you can see pci information, os x recognize this card link width x1 and PCIe gen 2 5 GT/s. This matches FL1100 data sheet. We already calculate above. this card can handle ~ upto 500 MB. 


2)asmedia 1142

From pci information, this card use Linkwidth x2 and gen 2 5GT/s. This card can handle 5 GT/s x2 x 8b/10b ~ 8 Gbps ~ up to 1000MBps. 



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