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7.5.5.3
CI_READ_WRITE Read/Write memory response-packet format
There are two slightly different forms of the response packet. For reads:
? The first byte of the response packet contains the command packet previously sent.
? The second byte is a general status byte.
? Bytes 3 through 32 are optional and contain data read from the internal memory map of the device.
Table 7-10. CI_READ_WRITE Read command response-packet format at mailbox level
Mailbox #
0
1
Description
Command byte
Status byte
Bit 7
0
COCO
Bit 6
0
Bit 5
0
ERR
Bit 4
0
Bit 3
1
0
Bit 2
0
0
Bit 1
VERF
0
Bit 0
TYPE
0
Read data
2-31
1
RDATA
1
Not applicable to Write functions
For writes:
? The first byte of the response packet contains the command packet previously sent.
? The second byte is a general status byte.
? Bytes 3 and 4 are optional and contain data the first address at which a Verify error was detected
(if VERF has been set).
Table 7-11. CI_READ_WRITE Write command response-packet format at mailbox level
Mailbox #
0
1
Description
Command byte
Status byte
Bit 7
0
COCO
Bit 6
0
Bit 5
0
ERR
Bit 4
0
Bit 3
1
0
Bit 2
0
0
Bit 1
VERF
0
Bit 0
TYPE
0
2
3
Verify error addr MSB
Verify error addr LSB
VERF_ERR_ADDR[15:8]
VERF_ERR_ADDR[7:0]
Table 7-12. CI_READ_WRITE command response field descriptions
Field
VERF
TYPE
Description
Verify Writes (not applicable in Read accesses)
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.
Type of Access
0 Write
1 Read
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
87
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