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Visitor grant.downie
Visitor
2,821 Views

XC7Z045-2FFG676E INIT_B stays low / cannot access DAP

Dear Sir/Madam,

On board bring-up I have an issue where INIT_B stays low and DAP cannot be accessed.

I have read AR56195

http://www.xilinx.com/support/answers/56195.html

 

The attached picture shows power-on with:

yellow=PROG_B
white=INIT_B

green=POR_B

 

SRST_B is not shown but is identical to yellow.
The time from yellow to green is approx 235ms.

 

All power supplies are at the correct levels before POR_B is de-asserted.

 

The FPGA is set to QSPI boot but no image in QSPI.

 

Power supplies are:

 

 

Bank 0, 12, 13 are +2V5

Bank 33 is +1V8

Bank 34,35 is +1V5

Bank 500,5001 is +2V5

Bank 502 is +1V5

VCCINT, VCCPINT is +1V0

VCCBRAM is +1V0

VCCAUX, VCCPAU is +1V8

VCCAUX_IO is +2V0

VCCPLL is +1V8

MGTAVCC is +1V0

MGTAVTT is +1V2

MGTVCCAUX is +1V8

 

Package markings:

XC7Z045

FFG676ACX1309

DF4536744A

2E

 

Using impact (Platform Cable USB DLC9) i can see that the IDCODE is correct.

However i see that all values are essentially 0 for temperature, voltage etc same for status registers.

On the ZC706 i get sensible values.

 

Boundary-scan chain validated successfully.
1: Device Temperature: Current Reading: -273.00 C, Min. Reading: -273.00 C
1: VCCINT Supply: Current Reading: 0.000 V, Min. Reading: 0.000 V
1: VCCAUX Supply: Current Reading: 0.000 V, Min. Reading: 0.000 V
'1': IDCODE is '00100011011100110001000010010011'
'1': IDCODE is '23731093' (in hex).
'1': : Manufacturer's ID = Xilinx xc7z045, Version : 2

 

Any pointers on what could be the problem or places to look would be appreciated. 

 

Regards Grant

power_on.JPG
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2 Replies
Visitor grant.downie
Visitor
2,818 Views

Re: XC7Z045-2FFG676E INIT_B stays low / cannot access DAP

Dear Sir/Madam,

An update.

I changed boot mode from QSPI to JTAG and INIT_B functions correctly and the FPGA can be programed however there
is still no DAP shown in iMPACT. The temperature, voltage reading were also non-zero and sensible as is the internal status. Although this does not solve the issue of not seeing DAP, hopefully it might give a clue.

Regards Grant

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Visitor grant.downie
Visitor
2,804 Views

Re: XC7Z045-2FFG676E INIT_B stays low / cannot access DAP

Hi All,

Solved MIO2.

Regards Grant

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