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Altera_Forum
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17 years ago

nStatus can't go high

I have just finished my pcb of EP3C25F324, but it can't work when I power on the board, all user IO pins stayed high, the nSTATUS remaid low, and nCONFIG statyed high. Is't the problem of POR? Or ...
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Altera_Forum
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10 years ago

I met the same problem with you: the nstatus can not go high and I can't configured the EP4CE22 via JTAG neither.

So have anyone solved this problem? Maybe you can help me with your experience.

FPGA: CYCLONE IV E EP4CE22E22C8

Quartus II version: 15.1

Document referred: cyclone IV E handbook page number : 8-56 and figure

Figure 8–29. Programming Serial Configuration Devices In-System Using the JTAG Interface

Customer made three protoboard , I am testing /working on two protoboard.

· First protoboard : using JTAG mode, device detected and programming process 100%.

· Issue during programming of a serial configuration device with the JTAG interface through the SFL : EPCQ device detected, programming of EPCQ done, but configuration data not transferred from EPCQ to FPGA after power up and nstatus pin remain low.

Here I am explaning you the procedure which I followed.

1) Checked all voltage supply at output of board’s regulators

VCCINT = 1.170

VCCD_PLL=1.189

VCCIO= 3.3

VCCA = 2.5

2) Checked all JTAG voltage at male header side.

TCK = GND.

TMS = 2.142.

TDI = 2.142.

TDO = floating.

VCCA = 2.5V

3) Checked MSEL pin as follow (cyclone IV E handbook page no. 173)

MSEL[0] = 3.3V

MSEL[1] = 0V

MSEL[2] = 3.3

4) Checked all Resistor value.

5) Document refer: As I mentioned above.

6) nCE pin : GND

7) nCEO: NC

8) nstatus : After the power up , this pin remain low for both the proto board:

1) First proto board, nstatus = 0.502V , device detected thru programmer but EPCQ to FPGA configure data not transferred. means configuration error

2) Second proto board, nstatus = 0.054v device does not detected.

9) Nconfig : After the power up , this pin remain high for both the proto board, voltage level as below.

1) First proto board (device detected board) = 3.3V

2) Second proto board (device did not detect board) = 2.730

10) CONF_DONE : After power up, CONF_DONE pin remain low.

11) EPCQ device connection with FPGA.

1) DATA[0] pin of FPGA to DATA pin of EPCQ.

2) DCLK pin of FPGA to DCLK pin of EPCQ.

3) nCSO pin of FPGA to nCS pin of EPCQ.

4) ASDO pin of FPGA to ASDI pin of EPCQ.

RAHUL SONI