lkml.org 
[lkml]   [2003]   [Jan]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: NCR 7452/3 POS - Retail CMOS NVRAM Driver
Richard B. Johnson wrote:
> On Wed, 15 Jan 2003, Gabriel Gomiz wrote:
>>
>>The memory chips that NCR uses are:
>>1) NEC D43256BGU - NCR POS Model 7452-1011
>> The chip is 256KB, but NCR says they use only 128KB
>>2) NEC D431000AGW - NCR POS Model 7453-1011
>> The chip is 1MB, but NCR says they use only 128KB
>>
>
> Look in the ethernet drivers for the "bit-banging" routines
> used to access NVRAM in the devices. You need to shift bits
> in and out of these devices. They are SERIAL ERPROMS. You
> can get data sheets by using your favorite search engine
> (as I just did).

I grabbed the datasheets of the memory chips and found out the
following, that changes the incorrect information that I had:

1) NEC D43256BGU is 256Kbits = 32KB (32768 words of 8 bits)

This chip has 15 address lines (A0-A14) and 8 data lines (I/O1 - I/O8).

2) NEC D431000AGW is 1Mbit = 128KB (131072 word of 8 bits)

This chip has 17 address lines (A0-A16) and 8 data lines (I/O1 - I/O8).

So it seems that these chips doesn't have a serial-like interface for
bit-banging, I am wrong?

--
.^. Gabriel Gomiz - Red Hat Certified Engineer (RHCE)
/V\
// \\
/( )\
^^-^^ s/Window[$s]/LINUX!!/g or die;

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:32    [W:0.032 / U:3.536 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site