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NAika's avatar
NAika
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7 years ago
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Structure of Cyclone Ⅴ and EPCQ-A

I am trying to realize the Cyclone V configuration using EPCQ-A(AS Mode). EPCQ-A Output Delay(tCLQX) min 1.5ns Cyclone V Input hold time(tDH) min 2.9ns Could you tell me what kind of connectio...
a_x_h_75's avatar
a_x_h_75
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7 years ago

Good spot. I think the datasheet for the EPCQ device is misleading. I think the problem is that Intel/Altera always capture the figures from the FPGA's point of view - if that makes sense (I'm not sure it does...)

Refer to figure 53 (page 95) of the equivalent Micron part. All timings, and in particular t_CLQV & t_CLQX are with respect to the rising edge of the clock:

https://www.micron.com/~/media/documents/products/data-sheet/nor-flash/serial-nor/mt25q/die-rev-b/mt25q_qlkt_l_512_abb_0.pdf

Given data is latched into the FPGA on the falling edge of DCLK I think perhaps Intel/Altera have tried to reference the same edge in the memory device's datasheet when, I suspect, they're no different to the Micron (or other 3rd party) devices.

Cheers,

Alex