Altera Stratix V Avalon-ST Instrukcja Użytkownika Strona 32

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The preceding timing diagram illustrates the following sequence of events:
1. The Application Layer indicates it is ready to receive requests by asserting RxSTReady_o. The RX
Avalon-ST interface initiates a Configuration Read, asserting its RxStSop_i and RxStValid_i signals.
2. At the falling edge of RxStSop_i, the Avalon-MM master interface asserts cfg_rden_o and specifies
the address on cfg_addr_o[31:0].
3. The Function 0 Avalon-MM slave interface asserts cfg_rddavalid_i and drives the data on
cfg_rddata_i[31:0].
4. On the falling edge of cfg_rddavalid_i, the TX interface asserts TxStSop_o and TxStValid_o and
drives the data of TxStData_o[255:0]. This is the Completion Request to the host corresponding to
its Configuration Read Request.
Timing for Configuration Write to Function 0 for the 256-Bit Avalon-ST Interface
The following timing diagram illustrates a configuration write to Function 0 starting at time 61859 ns in
the simulation.
The timing diagram illustrates the following sequence of events:
1. The Application Layer indicates it is ready to receive requests by asserting RxSTReady_o. The RX
Avalon-ST interface initiates a Configuration Write, asserting its RxStSop_i and RxStValid_i
signals.
2. At the falling edge of RxStSop_i, the Avalon-MM master interface asserts cfg_wren_o and specifies
the data on cfg_wrdata_o[31:0]. The Master interface also assert cfg_writeresponserequest_o, to
request completion status from Function 0.
3. On the falling edge of cfg_writeresponserequest_o, Function 0 asserts cfg_writeresponse-
valid_i.
4. On the falling edge of cfg_writeresponsevalid_i, the TX interface asserts TxStSop_o and
TxStValid_o and drives the completion data on TxStData_o[255:0].
3-8
Timing for Configuration Write to Function 0 for the 256-Bit Avalon-ST Interface
UG-01097_avst
2014.08.18
Altera Corporation
Getting Started with the Configuration Space Bypass Mode Qsys Example Design
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