Altera Stratix GX Transceiver Manuel d'utilisateur Page 165

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Vue de la page 164
Altera Corporation 6–11
January 2005 Stratix GX Transceiver User Guide
GigE Mode
Figure 6–11. Addition of an /I2/ Ordered Set During an Almost Empty Condition
8B/10B Decoder
The 8B/10B decoder is part of the Stratix GX transceiver block. The
purpose of the 8B/10B Decoder is to restore the 8-bit data plus 1-bit
control identifier from the 10-bit code.
10-Bit Decoding
The 8B/10B decoder translates the 10-bit encoded data into the 8-bit
equivalent data or control code. The byte deserializer receives the least
significant bit (LSB) of the 10-bit encoded code first, and the most
significant bit (MSB) last. The data received must be from the supported
Dx.y or Kx.y list. All 8B/10B control signals (disparity error, control
detect, and code error) are pipelined with the data in the Stratix GX
receiver block and are edge-aligned with the data. Figure 6–12 is a
diagram of the 10-bit to 8-bit conversion.
Figure 6–12. 10-Bit to 8-Bit Conversion
/D/ /D/ /D/ /I2//I2//S//D/ /I1//D/
/D/ /D/ /S//D//D//D/ /I2/ /I2//D/
to Rate Matche
r
from Rate Matcher
one /I2/ code added
/I2/ /I1/
7 6 5 4 3 2 1 0
HGF EDCBA
10b-8b conversion
7 6 5 4 3 2 1 09 8
gf iedcbajh
LSB received
first
MSB received
last
Parallel Data
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