TNT4882

[Shamsan]

Hello,

I have grounded the PAGED pin in the hardware design.

I wanted to use the chip in Turbo+7210 mode.

I cleard the bit ONES in HSSEL reg.

I used the page in command( AUXMR=50h), to access ISR0 reg.

I also cleared bit SISB in AUXRI reg to cause clearing the ISR0 by reading ISR0.

AUXMR=0x50;

write(0x0C,0x00); // wtite IMR0

AUXRI=0x84

AUXMR=0x50;

read(0x0C,isr0_reg);

do something

AUXMR=0x50;

read(0x0C,isr0_reg);

Here I suppose to find isr0_reg=0x00

But it hold the previous value from the first read.

Anybody knows the reason for reading the same value twice instead of zero in the sencond reading?

Has the page in pin role in it?

Thanks

Message Edited by Shamsan on 10-31-2006 04:41 PM

[Ebele_Obijiofor]

Hi Shamson,

It looks like your questions are being answered in this post.

Thanks!
Regards,

[Shamsan]

Hi All,

Since TNT4882 shares on buffer for input and output. How can I resolve this problem:

X1, X2 are varied length string

1) ibwr(UD, X1)

2) ibwr(UD, X2)

3) ibrd()

Statement 1:  X1 is a command  asking for data, therefore I put the data YZ in FIFOB, but the user didn't use Ibrd() to read it.

Statement 2:  X2 is a command  asking for data. Now an iterrupt occurs and I would read YZ instead of X2.

I was able to overcome this problem when I used NAT7210 because IN and OUT are two different registers.

Thanks

[Collin M]

You should only put data into the FIFO in response to a write when you become addressed to talk. Also, prior to responding you should always reset the FIFOs and counters.