[ARM] How to connect AT91SAM7XC256 with JLink ?

[bianchi77]

Guys,

I tried to connect to AT91SAM7XC256 with Jlink via JTAG,
but can not get it until now, here's what I got on Jlink commander :

SEGGER J-Link Commander V4.24c ('?' for help)
Compiled Mar 4 2011 20:04:53
DLL version V4.24c, compiled Mar 4 2011 20:04:34
Firmware: J-Link ARM V8 compiled Jan 31 2018 18:34:52
Hardware: V8.00
S/N: 20080643
Feature(s): RDI,FlashDL,FlashBP,JFlash,GDBFull
VTarget = 2.775V
Info: Could not measure total IR len. TDO is constant high.

WARNING: CPU core not found.
No devices found on JTAG chain. Trying to find device on SWD.

WARNING: CPU core not found.
No device found on SWD.
Did not find any core.
Info: Could not measure total IR len. TDO is constant high.

WARNING: CPU core not found.
No devices found on JTAG chain. Trying to find device on SWD.

WARNING: CPU core not found.
No device found on SWD.
Did not find any core.
J-Link>

What can I do to fix it ?

Please have a look to my schematic just in case I put JTAG wrongly....

Thanks

- - - Updated - - -

I checked all the voltage are fine, there's no 2.77V

- - - Updated - - -

I got it....put ERASE on HIGH....and it's detected

SEGGER J-Link Commander V4.24c ('?' for help)
Compiled Mar 4 2011 20:04:53
DLL version V4.24c, compiled Mar 4 2011 20:04:34
Firmware: J-Link ARM V8 compiled Jan 31 2018 18:34:52
Hardware: V8.00
S/N: 20080643
Feature(s): RDI,FlashDL,FlashBP,JFlash,GDBFull
VTarget = 2.775V
Info: TotalIRLen = 4, IRPrint = 0x01
Found 1 JTAG device, Total IRLen = 4:
#0 Id: 0x3F0F0F0F, IRLen: 04, IRPrint: 0x1, ARM7TDMI Core
Found ARM with core Id 0x3F0F0F0F (ARM7)
JTAG speed: 100 kHz
J-Link>