Altera Stratix V Avalon-ST Manual de usuario Pagina 73

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Signal Direction Description
words that contain data, resulting in the following encodings for
the 128-and 256-bit interfaces:
128-Bit interface:tx_st_empty = 0, tx_st_data[127:0]contains
valid datatx_st_empty = 1, tx_st_data[63:0] contains valid
data
256-bit interface:tx_st_empty = 0, tx_st_data[255:0] contains
valid datatx_ st_empty = 1, tx_st_data[191:0] contains valid
datatx_st_empty = 2, tx_st_data[127:0] contains valid
datatx_st_empty = 3, tx_st_data[63:0] contains valid data
For 256-bit data, when you turn on Enable multiple packets per
cycle, the following correspondences apply:
bit 1 applies to the eop occurring in rx_st_data[255:128]
bit 0 applies to the eop occurring in rx_st_data[127:0]
When the TLP ends in the lower 128bits, the following equations
apply:
tx_st_eop[0]=1 & tx_st_empty[0]=0, tx_st_
data[127:0] contains valid data
tx_st_eop[0]=1 & tx_st_empty[0]=1, tx_st_data[63:0]
contains valid data, tx_st_data[127:64] is empty
When TLP ends in the upper 128bits, the following equations
apply:
tx_st_eop[1]=1 & tx_st_empty[1]=0, tx_st_
data[255:128] contains valid data
tx_st_eop[1]=1 & tx_st_empty[1]=1, tx_st_
data[191:128] contains valid data, tx_st_data[255:192] is
empty
UG-01097_avst
2014.12.15
Avalon-ST TX Interface
5-21
Interfaces and Signal Descriptions
Altera Corporation
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