TTCAN | User’s Manual | Revision 1.6 |
manual_about.fm
3.5.19 TT Global Time Preset Register (addresses 0x65 & 0x64)
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
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| GTDiff |
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| rw |
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GTDiff | Global Time Preset |
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| 0x8000 |
| reserved. |
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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)
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 |
| 3 | 2 | 1 | 0 | |
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| ldSDL |
| QCS | QGTP | ECAL | EGTF | ELT | TMC | DET | ECS |
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| SWS | WGTD | SGT | |
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| r | r | rw | rw | rw |
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ldSDL | ld(Synchronisation Deviation Limit) |
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| Synchronisation Deviation ≤ 2(ldSDL + 5). |
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QCS | Quality of Clock Speed |
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| one |
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| SD ≤ SDL (always true in TTCAN Level 1). |
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| zero |
| Local clock speed not synchronised to Time Master clock speed. | |||||||||||||
QGTP | Quality of Global Time Phase |
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| one |
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| Global Time in phase with Time Master. |
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| zero |
| Global Time not valid (always true in TTCAN Level 1). |
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ECAL | Enable Clock Calibration |
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| one |
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| The automatic clock calibration in TTCAN Level2 is enabled. | ||||||||||||
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| zero |
| The automatic clock calibration in TTCAN Level2 is disabled. | |||||||||||||
EGTF | Enable Global Time Filtering |
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| one |
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| The Global Time filtering in TTCAN Level2 is enabled. |
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| zero |
| The Global Time filtering in TTCAN Level2 is disabled. |
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ELT | Enable Local Time |
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| one |
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| The Local Time is enabled. |
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| zero |
| The Local Time is stopped (default after hardware reset). |
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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.
BOSCH | - 37/77 - | 11.11.02 |
