Altera PHY IP Core Guia do Utilizador Página 55

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Chapter 4: XAUI PHY IP Core 4–13
Interfaces
March 2012 Altera Corporation Altera Transceiver PHY IP Core
User Guide
For the DDR XAUI variant, the start of control character (0xFB) is aligned to either
byte 0 or byte 5. Figure 4–6 illustrates byte 0 alignment.
Figure 4–7 illustrates byte 4 alignment.
Figure 4–6. Byte 0 Start of Frame Transmission Example
tx_clk
txc[7:0]
txd[7:0]
txd[31:8]
txd[39:32]
txd[55:40]
txd[63:56]
FF
01 00 F0 FF
start FB
AAAA
AA
frame data
frame data
frame data terminate FD
frame data
sfd AB
frame data
AAAAAA
preamble
preamble
preamble
Figure 4–7. Byte 4 Start of Frame Transmission Example
tx_clk
txc[7:0]
txd[7:0]
txd[23:8]
txd[31:24]
txd[39:32]
txd[55:40]
txd[63:56]
FF 1F 00 F8 FF
07
AA
frame data
0707
AAAA
AAAA
AA
frame data
07
sfd AB
frame data
terminate FD
start FB
frame data
frame data
frame data
preamble
preamble
preamble
preamble
preamble
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