AMX DESIGN XPRESS V 1.5 - PROGRAMMER GUIDE User's Guide Page 118

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7–20 Chapter 7: IP Core Interfaces
Cyclone V Hard IP for PCI Express
Cyclone V Hard IP for PCI Express December 2013 Altera Corporation
User Guide
Figure 7–20 illustrates the mapping between Avalon-ST TX packets and PCI Express
TLPs for four dword header with non-qword aligned addresses with a 64-bit bus.
Figure 7–21 illustrates the timing of the TX interface when the Cyclone V Hard IP for
PCI Express IP core backpressures the Application Layer by deasserting
tx_st_ready
.
Because the
readyLatency
is two cycles, the Application Layer deasserts
tx_st_valid
after two cycles and holds
tx_st_data
until two cycles after
tx_st_ready
is asserted.
Figure 7–22 illustrates back-to-back transmission of 64-bit packets with no intervening
dead cycles between the assertion of
tx_st_eop
and
tx_st_sop
.
Figure 7–20. 64-Bit Avalon-ST tx_st_data Cycle Definition for TLP 4-Dword Header with Non-Qword Aligned Address
coreclkout
tx_st_data[63:32]
tx_st_data[31:0]
tx_st_sop
tx_st_eop
Header 1 Header3 Data0 Data2
Header 0 Header2 Data1
Figure 7–21. 64-Bit Transaction Layer Backpressures the Application Layer
coreclkout
tx_st_sop
tx_st_eop
tx_st_ready
tx_st_valid
tx_st_data[63:0]
.. . . . . . . . . 00. . 00 ... BB... BB ... BBBB0306BBB0305A BB ... BB ... BB ... BB ... BB....
readyLatency
readyLatency
Figure 7–22. 64-Bit Back-to-Back Transmission on the TX Interface
coreclkout
tx_st_sop
tx_st_eop
tx_st_ready
tx_st_valid
tx_st_data[63:0]
01 . 00 . BB . BB . BB . BB . B. . BB . 01 . 00 . CC . CC . CC . CC . CC . CC .
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