Nexus
MPC5565 Microcontroller Reference Manual, Rev. 1.0
24-20
Freescale Semiconductor
shows the various message formats that the pin interface formatter has to encounter.
The double edges in
indicate the starts and ends of messages. Fields without shaded areas
between them are grouped into super-fields and can be transmitted together without end-of-packet
indications between them.
24.7.2.2.1
Rules of Messages
The rules of messages include the following:
•
A variable-sized field within a message must end on a port boundary. (Port boundaries depend on
the number of MDO pins active with the current reset configuration.)
•
A variable-sized field may start within a port boundary only when following a fixed-length field.
•
Super-fields must end on a port boundary.
•
When a variable-length field is sized such that it does not end on a port boundary, it is necessary
to extend and zero fill the remaining bits after the highest order bit so that it can end on a port
boundary.
•
Multiple fixed-length packets may start and/or end on a single clock.
•
When any packet follows a variable-length packet, it must start on a port boundary.
•
The field containing the TCODE number is always transferred out first, followed by subsequent
fields of information.
•
Within a field, the lowest significant bits are shifted out first.
shows the transmission
sequence of a message that is made up of a TCODE followed by three fields.
Figure 24-7. Transmission Sequence of Messages
Figure 24-6. Message Field Sizes
Message
TCODE
Field #1
Field #2
Field #3
Field #4
Field #5
Min.
Size
1
Bits
1
Minimum information size. The actual number of bits transmitted depends on the number of MDO pins
Max.
Size
2
Bits
2
Maximum information size. The actual number of bits transmitted depends on the number of MDO pins
Device ID Message
1
Fixed = 32
N/A
N/A
N/A
N/A
38
38
FIELD #3
MSB
LSB
1
2
3
FIELD #2
FIELD #1
TCODE
4
6 bits
Содержание MPC5565
Страница 18: ...MPC5565 Microcontroller Reference Manual Devices Supported MPC5565 MPC5565 RM Rev 1 0 09 2007...
Страница 34: ...MPC5565 Reference Manual Rev 1 0 Freescale Semiconductor 15...
Страница 35: ...MPC5565 Reference Manual Rev 1 0 16 Freescale Semiconductor...
Страница 325: ...Error Correction Status Module ECSM MPC5565 Microcontroller Reference Manual Rev 1 0 8 16 Freescale Semiconductor...
Страница 515: ...External Bus Interface EBI MPC5565 Microcontroller Reference Manual Rev 1 0 12 70 Freescale Semiconductor...
Страница 553: ...Flash Memory MPC5565 Microcontroller Reference Manual Rev 1 0 13 38 Freescale Semiconductor...
Страница 559: ...SRAM MPC5565 Microcontroller Reference Manual Rev 1 0 14 6 Freescale Semiconductor...
Страница 577: ...Boot Assist Module BAM MPC5565 Microcontroller Reference Manual Rev 1 0 15 18 Freescale Semiconductor...
Страница 895: ...Deserial Serial Peripheral Interface DSPI MPC5565 Microcontroller Reference Manual Rev 1 0 19 72 Freescale Semiconductor...
Страница 973: ...Preface MPC5565 Microcontroller Reference Manual Rev 1 0 21 36 Freescale Semiconductor...
Страница 1145: ...MPC5565 Register Map MPC5565 Microcontroller Reference Manual Rev 1 0 A 60 Freescale Semiconductor...
Страница 1153: ...Calibration MPC5565 Microcontroller Reference Manual Rev 1 0 B 8 Freescale Semiconductor...