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#1
Member
Registered: Apr 2007
Location: Philippines
Distribution: Kubuntu, Ubuntu, CentOS
Posts: 282
Rep:
What is the meaning of 32 bits x 16 bits in a flash memory?
Hello everyone,
I have been working on a uboot, and when I typed flinfo, this one shows up. I would like to know what is the meaning of that "32 bits x 16 bits"? Are they supposed to be multiplied to get something? 32 * 16 = 512 what? I would like to know what is the meaning of this part so that I can look it up in the flash memory datasheet and further understand the uboot flash code.
Code:
Bank # 1: INTEL 28F256P30B CFI conformant FLASH (32 bits x 16 bits
Regards,
archieval
#2
Member
Registered: Mar 2011
Location: Maryland, USA
Distribution: Ubuntu 10.04, PuppyLinux 5.2.5
Posts: 159
Rep:
From what I can gather from
this document , your device has a single 32-bit chip with a 16-bit data bus. (a 16-bit bus array is required for CFI compliance, regardless of the chip configuration).
#3
Member
Registered: Apr 2007
Location: Philippines
Distribution: Kubuntu, Ubuntu, CentOS
Posts: 282
Original Poster
Rep:
@Mr.Bill
From what you said, does it mean data are 16-bits wide? but what is the 32bit chip?
This is my device:
http://www.dinigroup.com/files/30666...iscrete_DS.pdf
From the source code of cfi_comp_flash.c, this is the printf statement.
Code:
printf("CFI conformant FLASH (%d bits x %d bits\n",
(info->portwidth << 3), (info->chipwidth << 3));
portwidth is 4 and chipwidth is 2. I am thinking where did the 4 came from in that datasheet, and why shift by 3.
Regards,
archieval
Last edited by archieval; 05-18-2011 at 12:47 AM .
#4
Member
Registered: Mar 2011
Location: Maryland, USA
Distribution: Ubuntu 10.04, PuppyLinux 5.2.5
Posts: 159
Rep:
Yes, for CFI conformance, data is 16 bits.
#5
Member
Registered: Apr 2009
Posts: 505
Rep:
Flash data bus is 16 bits and CPU data bus is 32bits.
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What is the meaning of 32 bits x 16 bits in a flash memory?
