SAM3A4C Atmel Corporation, SAM3A4C Datasheet - Page 822

• Manufacturer Part Number: SAM3A4C
• Manufacturer: Atmel Corporation

35.7.8.13
Figure 35-45. Frame Slot Mode
35.7.8.14
822
822
TXRDY
Write
US_LINID
Write
US_THR
LINTC
Bit Error
SAM3X/A
SAM3X/A
Break
Frame Slot Mode
LIN Errors
Header
Synch
This mode is useful only for Master nodes. It respects the following rule: each frame slot shall be
longer than or equal to TFrame_Maximum.
If the Frame Slot Mode is enabled (FSDIS = 0) and a frame transfer has been completed, the
TXRDY flag is set again only after TFrame_Maximum delay, from the start of frame. So the Mas-
ter node cannot send a new header if the frame slot duration of the previous frame is inferior to
TFrame_Maximum.
If the Frame Slot Mode is disabled (FSDIS = 1) and a frame transfer has been completed, the
TXRDY flag is set again immediately.
The TFrame_Maximum is calculated as below:
If the Checksum is sent (CHKDIS = 0):
If the Checksum is not sent (CHKDIS = 1):
Note:
• THeader_Nominal = 34 x Tbit
• TResponse_Nominal = 10 x (NData + 1) x Tbit
• TFrame_Maximum = 1.4 x (THeader_Nominal + TResponse_Nominal + 1)
• TFrame_Maximum = 1.4 x (34 + 10 x (DLC + 1 + 1) + 1) x Tbit
• TFrame_Maximum = (77 + 14 x DLC) x Tbit
• THeader_Nominal = 34 x Tbit
• TResponse_Nominal = 10 x NData x Tbit
• TFrame_Maximum = 1.4 x (THeader_Nominal + TResponse_Nominal + 1
• TFrame_Maximum = 1.4 x (34 + 10 x (DLC + 1) + 1) x Tbit
• TFrame_Maximum = (63 + 14 x DLC) x Tbit
Data 1
The term “+1” leads to an integer result for TFrame_Max (LIN Specification 1.3)
Protected
Identifier
Data3
Frame slot = TFrame_Maximum
Response
space
Data 2
Frame
Data 1
Data 3
Data N
Response
Data N-1
Data N
Frame Slot Mode
Checksum
Disabled
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
(Note:)
(Note:)
)
Frame Slot Mode
space
frame
Inter-
Enabled