256Mb and 512Mb (256Mb/256Mb), P30-65nm
Common Flash Interface
Common Flash Interface
The CFI is part of an overall specification for multiple command-set and control-inter-
face descriptions. System software can parse the CFI database structure to obtain infor-
mation about the device, such as block size, density, bus width, and electrical specifica-
tions. The system software determines which command set to use to properly perform a
WRITE command, a BLOCK ERASE or READ command, and to otherwise control the
device. Information in the CFI database can be viewed by issuing the READ CFI com-
mand.
READ CFI Structure Output
The READ CFI command obtains CFI database structure information and always out-
puts it on the lower byte, DQ[7:0], for a word-wide (x16) device. This CFI-compliant de-
vice always outputs 00h data on the upper byte (DQ[15:8]).
The numerical offset value is the address relative to the maximum bus width the device
supports. For this device family, the starting address is a 10h, which is a word address
for x16 devices. For example, at this starting address of 10h, a READ CFI command out-
puts an ASCII Q in the lower byte and 00h in the higher byte as shown here.
In all the CFI tables shown here, address and data are represented in hexadecimal nota-
tion. In addition, because the upper byte of word-wide devices is always 00h, as shown
in the example here, the leading 00 has been dropped and only the lower byte value is
shown. Following is a table showing the CFI output for a x16 device, beginning at ad-
dress 10h and a table showing an overview of the CFI database sections with their ad-
dresses.
Table 21: Example of CFI Output (x16 device) as a Function of Device and Mode
Hex
Offset
Hex
Code
ASCII Value
(DQ[15:8])
ASCII Value
(DQ[7:0])
Device
Address
00010:
00011:
00012:
00013:
00014:
00015:
00016:
00017:
00018:
51
52
00
00
00
00
00
00
00
00
00
Q
R
59
Y
P_IDLO
P_IDHI
PLO
Primary vendor ID
Primary vendor table address
Alternate vendor ID
PHI
A_IDLO
A_IDHI
:
:
:
:
:
:
:
:
PDF: 09005aef84566799
p30_65nm_MLC_256Mb-512mb.pdf - Rev. C 12/13 EN
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