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Revision 1.6TTCAN
11.11.02
manual_about.fm
3.5.19 TT Global Time Preset Register (addresses 0x65 & 0x64)
GTDiff Global Time Preset
0x0000-0x7FFF
Master_Ref_Mark = Master_Ref_Mark + GTDiff.
0x8000 reserved.
0x8001-0xFFFF Master_Ref_Mark = Master_Ref_Mark - (0x10000-GTDiff).
The Global Time Preset takes effect when the node is the current Time Master and when ‘1’ is
written to SGT in the TT Clock Control register. The next Reference Message will be
transmitted with the modified Master_Ref_Mark and with Disc_Bit = ‘1’, presetting the Global
Time in all nodes simultaneously.
GTDiff is reset to 0x0000 each time a Reference Message with Disc_Bit = ‘1’ becomes valid
or if the node is not the current time master.
GTDiff is locked (and WGTD is ‘1’) after setting SGT until the Reference Message with
Disc_Bit = ‘1’ becomes valid or until the node is no longer the current time master.
3.5.20 TT Clock Control Register (addresses 0x67 & 0x66)
ldSDL ld(Synchronisation Deviation Limit)
0x0-0x7
Synchronisation Deviation ≤ 2
(ldSDL + 5)
.
QCS Quality of Clock Speed
one
SD ≤ SDL (always true in TTCAN Level 1).
zero
Local clock speed not synchronised to Time Master clock speed.
QGTP Quality of Global Time Phase
one
Global Time in phase with Time Master.
zero
Global Time not valid (always true in TTCAN Level 1).
ECAL Enable Clock Calibration
one
The automatic clock calibration in TTCAN Level2 is enabled.
zero
The automatic clock calibration in TTCAN Level2 is disabled.
EGTF Enable Global Time Filtering
one
The Global Time filtering in TTCAN Level2 is enabled.
zero
The Global Time filtering in TTCAN Level2 is disabled.
ELT Enable Local Time
one
The Local Time is enabled.
zero
The Local Time is stopped (default after hardware reset).
Note :
ELT can only be written during Configuration Mode. It may not be set before the TUR configura-
tion registers are programmed. Once the Local Time is started, is remains active until the CPU
writes ELT to ‘0’ or until the next hardware reset. Local Time is also started by resetting Init in
the CAN Control register.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
GTDiff
rw rw
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ldSDL QCS QGTP ECAL EGTF ELT TMC DET ECS SWS WGTD SGT
rw r r rw rw rw rw rw rw rw r rw