Other Parts Discussed in Thread: SYSCONFIG
Hello,
I'm using the GPMC to Read/Write data in a FPGA, in synchrone non-multiplexed 16b mode. The Write part works perfectly but the Read don't.
Signals for a read request are set, timings are good FPGA provide data- BUT the DSP read only 0s.
First attempt : FPGA flashed, send a read request ==> read value : 0x00
FPGA JTAG probe shows that control signals are OK, physical probes on data lines did too.
second attempt : FPGA not flashed (it pull lines to 0 till data valid we want to avoid that), pull up set on several data lines to have a value to read ==> read value :0x00
Third attempt : initialise buffer with a random value to differentiate if it's updated or set to 0 ==> the buffer is set to 0 on read attempt
Others attempt : change base address write worked for some but never read, use reset values for config do write don't read.
Could you please tell me what I've missed and why the DSP can't read values available on data line ?
Thanks.
Config :
Sysconfif : 0x0
IrqEnable : 0x0
TimeOutControl : 0x0
Config : 0x0
Cfg1 : 0x28001003
Cfg2 : 0x000B1E00
Cfg3 : 0x000B1E00
Cfg4 : 0x0B001E0B
Cfg5 : 0x081C0C1F
Cfg6 : 0x8A000F80
Cfg7 : 0x8A000F80
Write and read function are as simple as possible
-Create pointer
-Make addr and affect to pointer
Write
-Affect buffer value to pointed address --> works perfectly
Read
-Affect pointed address value to buffer
