3.1.3. The AVST_READY Signal
Before beginning configuration, trigger device cleaning by toggling the nCONFIG pin from high to low to high. This nCONFIG
transition also returns the device to the configuration state.
Figure 12. Monitoring the AVST_READY Signal and Responding to Backpressure
AVST_CLK
AVSTx8_READY
or AVST_READY
AVSTx8_VALID
or AVST_VALID
AVSTx8_DATA[7:0
AVST_DATA[15:0]
AVST_data[31:0]]
must send no more
than 6 valid clocks after
ready goes low
data0 data1 data2 data3
The configuration files for Intel Agilex devices can be highly compressed. During configuration, the decompression of the bit
stream inside the device requires the host to pause before sending more data. The Intel Agilex device asserts the
AVST_READY signal when the device is ready to accept data. The AVST_READY signal is only valid when the nSTATUS pin is
high. In addition, the host must handle backpressure by monitoring the AVST_READY signal and may assert AVST_VALID
signal any time after the assertion of AVST_READY signal. The host must monitor the AVST_READY signal throughout the
configuration.
Note: For Avalon-ST x16 and x32, after Power-On-Reset you must not send data to the device until it indicates it is ready using
nSTATUS. You must drive nCONFIG low and wait for nSTATUS to go low. Next, you should drive nCONFIG high and wait for
nSTATUS to go high. The device can starting sending data when AVST_READY asserts.
3. Intel Agilex Configuration Schemes
UG-20205 | 2019.10.09
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