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ROM
Table 7-12. CI_READ_WRITE command response field descriptions
Field
COCO
ERR
RDATA
VERF_ADDR
7.5.5.4
Description
Command Complete
Because flash program sequences take quite some time to complete, you may need to repeatedly poll the
port before the operation completes.
1 Previous command has been completed or aborted. (The ERR flag will be set for aborted sequences.)
0 Previous command not completed.
Error Flag
For the set of common CI error codes, see Table 7-4 on page 82 .
Read Data
If ERR = 000, this is the NUMBER of bytes of data transferred in read command.
If ERR is any other value, the data contained in these bytes is not guaranteed.
Verify Address[15:0]
For write operations with verify, this is the lower 16 bits of the first location in which a verify error was
detected.
CI_READ_WRITE access/security policies
Table 7-13 details security policies for the CI Read/Write command.
Table 7-13. Access/security policies for CI read/write memory command
Security enabled
Security disabled
Main array of flash memory
RAM
ROM
Read
No access
No access
No access
Write
Read
Allowed
CI_PW match
required
Write
Subject to PRR
Allowed
Not allowed
16-bit peripherals
8-bit peripherals and RGPIO
Policy descriptions are:
No access
No access
CI_PW match required
Allowed
Subject to PRR
CI_PW match required
Writes to flash memory are restricted to those in which the PRR
[page number] bit is 1b. Flash protection must be disabled prior
to any attempt at programming.
A valid command interpreter password must be supplied.
7.5.5.5
CI_READ_WRITE Read/Write memory example
This example does the following:
88
?
?
?
Reads 4 bytes from RAM
Starts at location 0x(00)80_0008
Uses the I 2 C slave port, mapped to location 0x03 on the I 2 C bus
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
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