OMAPL137 RESET CIRCUIT

Hi Senthil

Thanks for your reply

the reset circuit for omapl137evm is very complicated. Is there no other way? please help me to do a simple reset circuit for my board.

i attached the shematic format of my reset circuit. Can you edit this file and send to me?

Regards,

Mahdi

Hello Mahdi,

I'm not able to open your schematics. It says the file is broken.

Anyway i will sketch a simple reset block diagram and share you.

Regards,
Senthil

Hello Mahdi,

I have attached the reset block diagram for your reference.

Please note all signals are active low.

Regards,

Senthil

Hi Senthil

Thanks for your reply

I changed the reset circuit based on your  reset block diagram and attached the new reset circuit shematic with boot and jtag and power.   

Please check this shematic and tell me the result .

I used 14 pin TI jtag. I think that jtag reset ( TRST pin) must be connected to the (TRST pin) of omapl137.

Do I must connect the jtag reset (TRST pin) to (SN74LVC1G08DBVR)  or  (OMAPL137) or both? 

Regards,

Mahdi

Hello Mahdi,

The reset logic seems to be good. In your case, TRST pin should be connected to OMAPL137 alone.

Please note, you have not followed the proper power sequence as recommended in OMAPL137 datasheet. Without proper power sequencing, you might see many issues in the device operation.

Refer the below application note.

http://www.ti.com/lit/an/slva513/slva513.pdf

Regards,

Senthil

Hi Senthil

Thanks for your reply

 i used tlv320aic29 in my board. tlv320aic29 connected to omapl137 with spi1 and mcasp1. i attached the shematic.

i connected the headphone to (INT_MIC+ and MIC_GROUND) and the speaker to (AF-OUT+ and AF-OUT-).

i used mcasp1 of omapl137 for loopback on tlv320aic29.

i send below command for configuration respectively, with spi1 of omapl137:

PAGE 1 CONTROL REGISTER MAP 
address           command
0x04                 0xbb00
0x00                 0x1f70
0x01                 0x4000
0x02                 0x0000
0x03                 0x0001
0x0a                 0x0fff
0x0b                 0x0000
0x0c                 0x0404
0x0d                 0x0012

PAGE2 CONTROL REGISTER MAP 
address           command
0x00                 0x413f
0x01                 0x8000
0x02                 0x0080
0x03                 0x8030
0x04                 0x0802
0x05                 0x29c3
0x06                 0x0800
0x1b                 0x8118
0x1c                 0x0000
0x1d                 0x3fc0
0x1e                 0x3a76
0x1f                  0x8040
0x20                 0xa003
0x21                 0x00c8
0x22                 0x0004
0x23                 0x0000
0x24                 0x2800
0x25                 0x5d20
0x26                 0xffe0
0x27                 0x0000

when i power on  the board, I heard the horn from the speaker but when i reset the board i can heard the my voice from the speaker correctly. I fixed the reset circuit based on proposed block diagram but my problem is still not resolved. i think that something wrong in shematic or configuration.

Please help me to fix this problem.

Regards,

Mahdi

Hello Mahdi,

Please don't post the same query in multiple threads. This query is already posted in below thread.

http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/p/363613/1284887.aspx#1284887

Someone may working on this issue and get back to you, please wait until then.

Thanks for your patience and understanding.

Regards,

Senthil