Serial communication

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Hello,

I have a system composed of a Cyclone device and an
8051-like CPU, which acts as a passive-serial configuration
device and later as a USB2.0 coupler. The FPGA
configuration image is clocked to Cyclone using the UART
interface (synchronous mode 0, i.e. TXD acts as DCLK
and RXD presents one bit at a time to the DATA0 pin).
There are also two inverters at these lines: the first one
inverts DCLK, because Cyclone uses the opposite edge
than '51 to latch a configuration bit.  The second inverter
(at RXD -> DATA0) relaxes timing constraints by compensating
the delay introduced by DCLK inversion.

Now I would like to reuse resources and add a serial
synchronous communication channel between Cyclone
and '51, where Cyclone acts as a slave device. So, is
it possible to read DCLK and DATA0 from an operating
Cyclone, i.e. to simulate an ASMI-like interface?

    Best regards
    Piotr Wyderski


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