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ROM
7.5.6
7.5.6.1
CI_ERASE
Erase-flash function description
This function encapsulates all functions for page- and mass-erase actions of the flash memory.
The command packet is six mailboxes in length. The response packets are two to four mailboxes in length.
User requests for mass-erase will honor protection provided by the PRR. Only pages whose PRR bit is 1
will be erased. Effectively, the mass-erase operation is translated on the fly to a series of page-erase
operations.
Page-erase requests are not supported for secured devices . A mass-erase must be requested .
The same function call encapsulates both page- and mass-erase operations. The ROM software will use
mass-erase when possible, page-erase when not.
7.5.6.2
Erase-command packet format
The five-bit command code for the erase command is 0x02.
Table 7-16. Command packet format at mailbox level
Mailbox #
0
Description
Command byte
Bit 7
0
Bit 6
0
Bit 5
0
Bit 4
1
Bit 3
0
Bit 2
0
Bit 1
VERF
Bit 0
0
1
2
3
4
5
6 - 31
Parameter byte
MASK
NOT USED
PB = 0xC5
MASK[31:24]
MASK [23:16]
MASK [15:8]
MASK [7:0]
NOT USED
Table 7-17. CI_ERASE command field descriptions
Field
VERF
PB
90
Description
Verify Erase
If a verify error is found, the address at which the first error is detected will be written to mailboxes 2 and 3.
0 Do not verify
1 Verify that written value matches intent.
PB
Constant value = 0xC5
Values other than 0xC5 will trigger a security error.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
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