BQ26100_15 Datasheet, PDF (14/29 Pages) Texas Instruments – Based Security and Authentication IC

bq26100
SLUS696B – JUNE 2006 – REVISED AUGUST 2015
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Read
Page 4
M/F = 0xFA
Write
Page 4
M/F = 0xAF
(1) _{Master TX:}
16-bit address, A
(1) _{Master TX:}
16-bit address, A
Master RX:
CRC of M/F cmd & A
Master TX:
8-bit data, D
Master RX:
8-bit data @ A
A=A+1
A = 0x001F?
NO
YES
Master RX:
CRC of all data transmitted
Master RX:
CRC of M/F cmd, A & D
Master TX:
Programming Pulse
Master RX:
CRC of preloaded
A[7:0] & shifted D
Master RX:
D
Master TX:
8-bit data, D
CRC = A[7:0]
A = A +1
ROM
Function
Flow
A = 0x001F?
NO
YES
ROM
Function
Flow
(1) 16-Bit address is sent with lower 8-bit address followed by higher 8-bit address with least significant bit first.
Figure 13. General Memory OTP Write/Read Flows
7.5.2.1.3 Status – Memory Function Commands 0xAA (Read) and 0x55 (Write)
Unlike the general use pages, the status bytes read 0xFF when not programmed and a bit is programmed from 1
to 0. A zero represents the active state.
Address 0x0007 Reserved
Default value is 0xFF
Address 0x0006 Key Index
The host can determine which one of multiple keys was programmed into the bq26100 device by reading
the key index value.
Address 0x0005 – 0x0001 Page Redirection
A pointer for alternative page information, these bytes can be used if information in the original page has
been invalidated. The host can read these locations and direct reads and/or writes to the page pointed to
by the value in the register. For example, if the data in page 2 is corrupted by an incorrectly written data
value, and the corrected data is in page 1, the value written to address 0x0003 would be 0xFE (1’s
complement value of 0x01). Upon reading address 0x0003, the host would receive 0xFE and would take
the 1’s complement to determine that page 1 contains redirected data.
ADDRESS
0x0005
0x0004
0x0003
0x0002
0x0001
Table 4. Page Redirection
PAGE REDIRECTED
Page 4
Page 3
Page 2
Page 1
Page 0
14
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