TC1784
FlexRay™ Protocol Controller (E-Ray)
User´s Manual
20-237
V1.1, 2011-05
E-Ray, V3.13
MBF
⇒
OBF is requested, the MBF
⇒
OBF has to wait until the IBF
⇒
MBF has
completed.
In case that e.g. a second IBF
⇒
MBF is requested, a MBF
⇒
OBF is requested and a
IBF
⇒
MBF is ongoing, the MBF
⇒
OBF has to wait until the first IBF
⇒
IBF has completed.
The second IBF=MBF has to wait until the MBF
⇒
OBF has completed (see figure 20-20)
independent whether MBF
⇒
OBF or second IBF
⇒
MBF is requested first.
Figure 20-20 Multiple IBF/OBF Request
Worst case for single request
When a message with a large payload length is received the TBF
⇒
MBF is started at the
begin of the next slot (n+1). If the next slot is a dynamic slot without
transmission/reception (minislot), it may happen that the TBF
⇒
MBF has not finished
until begin of the next but one slot (n+2). In this case the TBF
⇒
MBF will be service
requested (break) to start a transmission in the next but one slot (MBF
⇒
TBF) and/or to
update the slot status (SS
⇒
MBF) for the RX-buffer corresponding with next slot (n+1).
After this interruption the TBF
⇒
MBF is continued.
Figure 20-21 Address Counter Scheme of Message RAM (simplified)
For the transfers IBF
⇒
MBF / MBF
⇒
OBF, TBF
⇒
MBF and MBF
⇒
TBF separate
address-counter are implemented (see Figure 20-21).
write to ibcr-register
write to obcr-register
IBF
⇒
MBF
MBF
⇒
OBF
1
1
2
3
3
2
acnt_mbf
addr_mbf(10…0)
acnt_mbf_find_reg
acnt_mbf_t2m_reg
acnt_mbf_m2t_reg
acnt_mbf_io_reg
Содержание TC1784
Страница 1: ...User s Manual V1 1 2011 05 Microcontrollers TC1784 32 Bit Single Chip Microcontroller ...
Страница 3: ...User s Manual V1 1 2011 05 Microcontrollers TC1784 32 Bit Single Chip Microcontroller ...
Страница 950: ...TC1784 Direct Memory Access Controller DMA User s Manual 11 132 V1 1 2011 05 DMA V3 03 ...
Страница 1949: ...TC1784 General Purpose Timer Array GPTA v5 User s Manual 21 297 V1 1 2011 05 GPTA v5 V1 14 ...
Страница 2350: ...w w w i n f i n e o n c o m Published by Infineon Technologies AG Doc_Number ...