Download GPL162002A/162003A Programming Guide

GPL162002A/162003A Programming Guide
P_CHECKSUM1_HB
Bit
15
14
0x7833
13
12
11
10
NAND Flash High Byte Check Sum High Value
9
Function
Init
Bit
7
6
5
4
3
2
1
0
0
0
0
0
0
0
CHECKSUM1_HB
0
0
0
0
Function
Type
[15:0] CHECKS
R/W
UM1_HB
17.5
8
0
0
0
0
0
0
Description
Condition
NAND Flash High byte 256~511 bytes check sum value.
This register is valid only when NAND flash set to 16-bit mode.
l
a
i e
t
n s
e
U
d
i
f
n 司
o
C 公
s
限
u 有
l
p 份
l
a
r
e 股
n
e 技
G 科
格
普
Special Note
As for ECC check error registers, here are some descriptions.
y
l
n
O
For 8-bit type nand flash, the unit of ECC logic calculation is 512 bytes, and the results can correct 1 bit
error for each 256 bytes and determine two bit errors for each 256 bytes. For 0~255 byte, the error
information is stored in 0x785E (P_ECC_ERR0_LB).
For 256~511 byte, the error information is stored
in 0x785F (P_ECC_ERR1_LB).
For 16-bit type NAND flash, the unit of ECC logic calculation is 256 words or 512 words.
For 256 words, the ECC result can correct 1 bit for low 256 bytes and high 256 bytes, respectively, and
determine two bit errors for low 256 bytes and high 256 bytes, respectively. For 0~255 low byte, the
error information is stored in 0x785E (P_ECC_ERR0_LB).
For 0~255 high byte, the error information is
stored in 0x784E (P_ECC_ERR0_HB).
For 512 words, the error information is described as follows. For 0~255 low byte, the error information is
stored in 0x785E (P_ECC_ERR0_LB). For 256~511 low byte, the error information is stored in 0x785F
(P_ECC_ERR1_LB).
For
0~255
high
byte,
the
error
information
is
stored
in
0x784E
(P_ECC_ERR0_HB).
For 256~511 high byte, the error information is stored in 0x784F
(P_ECC_ERR1_HB).
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o
F
© Generalplus Technology Inc.
PAGE 246
V1.0 – Dec. 20, 2006