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Slave Port Interface
8.3.1
Read buffer
When any byte is read by the master, the entire four-byte region in which that byte resides will be cached
in a four-byte, line buffer. Reads of subsequent bytes will be done from the buffer, ensuring that the master
sees consistent data in multiple-byte variables.
This process is best seen by way of example. The Version 1 ColdFire CPU uses big-endian addressing. The
user is encouraged to view the mailbox area as shown in Table 8-1 . The four-byte read buffer can be used
to make simultaneous reads of the mailboxes in any row of the table.
Table 8-1. Mailbox memory map
MSB address
MSB
LSB
0x00
0x04
0x08
0x0C
0x10
0x14
0x18
0x1C
SP_MB0
SP_MB4
SP_MB8
SP_MB12
SP_MB16
SP_MB20
SP_MB24
SP_MB28
SP_MB1
SP_MB5
SP_MB9
SP_MB13
SP_MB17
SP_MB21
SP_MB25
SP_MB29
SP_MB2
SP_MB6
SP_MB10
SP_MB14
SP_MB18
SP_MB22
SP_MB26
SP_MB30
SP_MB3
SP_MB7
SP_MB11
SP_MB15
SP_MB19
SP_MB23
SP_MB27
SP_MB31
An example of the legal allocation of variables to these locations is shown in Table 8-2 .
Table 8-2. Valid mailbox organization
MSB Address
MSB
LSB
0x00
0x04
0x08
0x0C
0x10
0x14
0x18
0x1C
Variable 1 (MSB)
Variable 2 (MSB)
Variable 3 (MSB)
Variable 4 (MSB)
Variable 6 (MSB)
Variable 8 (MSB)
Variable 10
Variable 14
(MSB+1)
(MSB+1)
(MSB+1)
(LSB)
(LSB)
(LSB)
Variable 11
Variable 15
(MSB+2)
(MSB+2)
(MSB+2)
Variable 5 (MSB)
Variable 7 (MSB)
Variable 9 (MSB)
Variable 12
Variable 16
Variable 1 (LSB)
Variable 2 (LSB)
Variable 3 (LSB)
(LSB)
(LSB)
(LSB)
Variable 13
Variable 17
In Table 8-2 , variables 1, 2 and 3 are 32-bit variables. Variables 4 through 9 are 16-bit variables and
variables 10 through 17 are eight-bit variables. All variables are guaranteed to have self-consistent values
when read by the sensor master.
An invalid allocation of variables would have variables spanning rows as shown in Table 8-3 .
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
122
Freescale Semiconductor, Inc.
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