i done a project based on c8051F330p(24pin).
i replace that controller with c8051F330(20pin) with as required wiring.
while programming the controller it gives error.

Flash read failure.
Packet not available failure.

is it replacement ok?
That's what you have to decide
Unfortunately you provided very little information. If you've ensured that pin assignment is correct, it might be soldering error, or ESD, or...or...

while programming the controller it gives error.
That means the chip itself is properly detected?
What about the PCB? Is it a self-made PCB? Maybe it's a power supply problem, what about the supply capacitors? Are they placed as near as possible to the pin?

Regards,

I am not yet decided.
i am asking you.

I already programmed C8051F330P(24dip) on same PCB, Its working fine.

According to you suggestion i verified soldering.
No problem with that.

i am asking you.
And I answered based on the informations you provided:
- soldering okay
- wiring okay
- ESD failure -> try another chip
- chip properly detected -> not answered by you
- chip full erase before programming/reading (maybe security bits are active) -> check it
- PCB self-made? -> not answered by you
- capacitors close to chip supply pins -> not answered by you

You see, I already have answered as good as I can. Your part still is partially open

Regards,

PCB was self made.
capacitors ARE CLOSED to chip supply pins.

i tried on 3(20dip) controllers.
when i press connect it was connected.

On 1st Time:
when try to erase code space it was erased.
when i try to download
it gives error like this
FLASH READ FAILED
PACKET NOT AVAILABLE FAILURE

On 2nd try:
when try to erase code space AGAIN
1)It giveS SLFL configuration error.

2)TARGET FAILED TO RESPOND
SYSTEM IS BEING DISCONNECTED

3)FLASH READ FAILED
PACKET NOT AVAILABLE FAILURE

okay, now I've a basic understanding about the situation

PCB was self made.
Okay. Please describe the connections of RST and C2D signals. If a RC-reset circuit is used, try it without the capacitor.
Also describe the power supply.

when i press connect it was connected.
Okay. So communication itself is (mainly) good. How long is the cable from debug adapter to the board and from the board connector to the MCU?

Which tool are you using to download? SiLabs provides more than one tool (IDE, production programmer, etc.) to program the device, so try a different one and give feedback about the behaviour.

Regards,

i didnt provide separate reset circuit in my project.
i used 10PIN connector for debugger in(C2)interface. in that
Pin 1-------> +3.3
pin 2,3,9---> GND
pin 4-------> C2D
Pin 7-------> C2CK/RST
remain are NC

thank you.
these pins were routed according to silabs development board.

LM2937 regulator for 3.3v volts.
when i checked on supply pins of controller
its around 3.273V.

i use same cable that comes with debugger.
it is a small length from connector to controller.

these pins were routed according to silabs development board.
This means you have exactly the same circuit (maybe without the reset button)?

What about the suggested removal of the reset capacitor?

LM2937 regulator for 3.3v volts.
when i checked on supply pins of controller
its around 3.273V.
Okay, I think it's not a supply problem.

i use same cable that comes with debugger.
it is a small length from connector to controller.
Should be okay if no other near signals could disturb.

i am using SiLabs USB Debugger.
That's clear, but I asked you to try one of the available software tools, e.g. if you use the IDE to download the software try the production programmer software and vice versa. With this test I want to verify if it might be a problem of the download application.

Regards,

no capacitor at RESET circuit.
i will try on other programmer.

Regards,
hari

i programmed C8051F330(20pin) with silabs debugger alone(OUTCIRCUIT) its ok.
when i replaced C8051F330(24pin) with this one.with required wiring.

its working but not working as i required.
same program working fine with 24pinDip.

how, would be nice to know

Programming on PCB was problem.
Programming out circuit ok.

Some loose connections.