[Discuss-gnuradio] flowstates - FX2

[Dominik Auras]

Hi!

A more specific question on the FX2:

do {                                    \
     FLOWSTATE = 0x81;                  \
     FLOWLOGIC = 0x2d;                  \
    FLOWEQ0CTL = 0x26;                  \
    FLOWEQ1CTL = 0x00;                  \
   FLOWHOLDOFF = 0x04;                  \
       FLOWSTB = 0x04;                  \
   FLOWSTBEDGE = 0x03;                  \
FLOWSTBHPERIOD = 0x02;                  \
GPIFHOLDAMOUNT = 0x00;                  \
} while (0)

If I have reengineered this correctly (gpif.gpf crashes the current GPIF 
Designer, importing gpif.c skips the flow states), you set to transfer 
data at rising AND falling edge while in flow state. Is this correct?

What I have found is:
state 1 is flow state (for both waveforms)
for flowstates:
for fifowr:
if TCXpire and TCXpire then - else WEN, BOGUS
Master Strobe Pin "unused", Half Period 2 (=1 clock)
Holdoff pin ="unused",but holdoff not asserted
for fiford:
if TCXpire and TCXpire then - else REN, OE, BOGUS
everything else not changed from fifowr

DP:
fiford:
if TCXpire and TCXpire then S2 else S1
etc....


Btw. there is an application note on flow states (I saw that someone 
stated that these are barely documented):
http://www.cypress.com/?rID=12951


Best regards
Dominik