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ROM
7.5.5
7.5.5.1
CI_READ_WRITE
Description
This function encapsulates all memory read/write functions, including those required for programming
flash memory. Please note that flash memory must be erased prior to any program operation.
Memory mapped components, RAM, ROM and flash memory can be read/written with a common set of
memory-access sequences. Read commands require eight mailbox locations. Write commands also require
eight locations, but with an additional payload of 0 to 24 bytes of write data stored in mailboxes 8 through
31.
Payload offsets map to on-chip addresses one-to-one. The first location accessed in the memory map
corresponds to the value specified with the MEM and ADDR[15:0] parameters. Addresses are
auto-incremented as the payload size increases.
NOTE
The 16-bit peripherals are restricted to word and long-word accesses on read
and write. Flash is restricted to long words during programming sequences.
The CI read/write commands are not responsible for checking that the
packet structure has data packet sizes which are Modulo 2 or 4 for the
various types. It is the responsibility of the user to make sure they are
correct.
Read response packets are two mailboxes plus the payload in length. Write response packets consume four
mailbox values.
7.5.5.2
CI_READ_WRITE Read/Write memory command-packet format
The five-bit command code for the read/write command is 0x01.
Table 7-8. CI_READ_WRITE command-packet format at mailbox level
Mailbox #
0
Description
Command byte
Bit 7
0
Bit 6
0
Bit 5
0
Bit 4
0
Bit 3
1
Bit 2
0
Bit 1
VERF
Bit 0
TYPE
1
2
3
4
5
6
7
8 - 31
Parameter byte
Command interpreter
password
Address bits [15:8]
Address bits [7:0]
Write data 1
MEM
CI_PW[31:24]
CI_PW[23:16]
CI_PW[15:8]
CI_PW[7:0]
ADDR[15:8]
ADDR[7:0]
WDATA
NUMBER
1
Not applicable to Read Operations
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor, Inc.
85
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