AN4536 Application Note Rev. 2.0 1/2014
Freescale Semiconductor
17
OTP Overview
2.4.2
OTP Redundant Bits
Some functions are assigned redundant bits, which are XORed, to allow that function to be changed multiple times.
These are the functions that have redundant OTP fuse bits:
•
Sequence Clock Frequency (Sequence delay)
•
DVS Clock Frequency (Initial slew rate)
•
Power button function
•
Fuse POR
Table 23
shows the I
2
C registers in the Extended Page 1 dedicated to redundant bits for the four functions
mentioned. The XORed bits are read-only.
Table 23. OTP Redundant Bits Registers
Extended Pg 1
I
2
C Data Bits
Addr
Reg Name
7
6
5
4
3
2
1
0
E0
OTP PU
CONFIG1
–
–
–
PWRON
CFG1
SWDVS_CLK1[1:0]
SEQ_CLK
SPEED1[1:0]
0
0
0
x
x
x
x
x
E1
OTP PU
CONFIG2
–
–
–
PWRON
CFg2
SWDVS_CLK2[1:0]
SEQ_CLK
SPEED2[1:0]
0
0
0
x
x
x
x
x
E2
OTP PU
CONFIG3
–
–
–
PWRON
CFG3
SWDVS_CLK3[1:0]
SEQ_CLK
SPEED3[1:0]
0
0
0
x
x
x
x
x
E3
OTP PU
CONFIG XOR
–
–
–
PWRON
CFG_XOR
SWDVS_CLK3_XOR
SEQ_CLK_SPEED
XOR
0
0
0
x
x
x
x
x
E4
OTP FUSE
POR1
TBB_POR SOFT_FUSE
POR
–
–
–
–
FUSE
POR1
–
0
0
0
0
0
0
x
0
E5
OTP FUSE
POR1
RSVD
RSVD
–
–
–
–
FUSE
POR2
–
0
0
0
0
0
0
x
0
E6
OTP FUSE
POR1
RSVD
RSVD
–
–
–
–
FUSE
POR3
–
0
0
0
0
0
0
x
0
E7
OTP FUSE
POR XOR
RSVD
RSVD
–
–
–
–
FUSE
POR_XOR
–
0
0
0
0
0
0
x
0
