NAND08GAH0A NUMONYX [Numonyx B.V], NAND08GAH0A Datasheet - Page 111

• Manufacturer Part Number: NAND08GAH0A
• Manufacturer: NUMONYX [Numonyx B.V]

NAND08GAH0A, NAND16GAH0D
11.2
Figure 51. CRC16 generator/checker
data in
CRC16
The CRC16 is used for payload protection in block transfer mode. The CRC check sum is a
16-bit value.
It is computed as follows:
The generator polynomial is
All CRC registers are initialized to zero.
The first bit is the first data bit of the corresponding block.
The degree n of the polynomial is the number of bits of the data block decreased by one
(e.g. n = 4095 for a block length of 512 bytes).
The generator polynomial is a standard CCITT polynomial.
The code has a minimal distance d set to 4 and is used for a payload length of up to 2048
bytes (n <= 16383).
The same CRC16 calculation is used for all bus width. In 4-bit and 8-bit bus width, the
CRC16 is calculated for each line separately. Sending the CRC is synchronized so the CRC
code is transferred at the same time in all lines.
M x ( )
CRC 15… 0
G x ( )
[
=
=
firstbit
x
16
]
+
=
x
12
×
Remainder M x ( )
+
x
n
x
5
+
+
sec
1
ondb
[
(
it
(
×
x
×
n 1
–
x
16
+
)
)
… lastbit
⁄
+
(
G x ( )
)
×
x
0
Error protection
data out
AI13108
111/116