GR740-UM-DS, Nov 2017, Version 1.7 376 www.cobham.com/gaisler
GR740
Table 475. 0x020 - CTRL - Control
31 30 29 24 23 16 15 0
NC IS - SPWTC CPF
00 0 0 0
rw rw r rw rw
31: New Command (NC) - New command is set to provide a new time value.
30: Init or Sync (IS) - ’1’ Initialization of received time message
’0’ Synchronisation of received time message
(only for target).
29: 24 RESERVED
23: 16 Spacewire Time-code (SPWTC) - Spacewire Time-code value used for initialization and synchroni-
sation.
In initiator the SpaceWire Time-Codes generated internally using the local ET counter matches this
register a Time Message TM interrupt will be generated which is used to send Time message over the
SpaceWire network.
In target this register should match the received SpaceWire Time-code for time qualification.
15: 0 Command Preamble Field (CPF) - The number of coarse and fine time available in Command
Elapsed Time registers should be mentioned in this field. Based on this preamble field the target will
initialize or synchronise the local ET counter (only for target).
Table 476. 0x024 - CET0 - Command Elapsed Time 0
31 0
CET0
0
rw
31: 0 Command Elapsed Time 0 (CET0) - Initialize or Synchronise local ET counter value (0 to 31).
Table 477. 0x028 - CET1 - Command Elapsed Time 1
31 0
CET1
0
rw
31: 0 Command Elapsed Time 1 (CET1) - Initialize or Synchronise local ET counter value (32 to 63).
Table 478.0x02C - CET2 - Command Elapsed Time 2
31 0
CET2
0
rw
31: 0 Command Elapsed Time 2 (CET2) - Initialize or Synchronise local ET counter value (64 to 95).
Table 479.0x030 - CET0 - Command Elapsed Time 3
31 0
CET3
0
rw
31: 0 Command Elapsed Time 3 (CET3) - Initialize or Synchronise local ET counter value (96 to 127).
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