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5.2
COMI Data Transfer
Big/Little endian selection of the COMI is done using bit 2 of SICR.
When SICR (0x00) Bit 2 = '0', the COMI data port is in little endian mode.
When SICR (0x00) Bit 2 = '1', the COMI data port is in big endian mode.
Little endian mode selected:
-
8 bit data port (default after reset)
- byte 0 is transferred via CMDATA7 - CMDATA0
-
16 bit data port
- byte 0 is transferred via CMDATA7 - CMDATA0
- byte 1 is transferred via CMDATA15 - CMDATA8
-
32 bit data port
- byte 0 is transferred via CMDATA7 - CMDATA0
- byte 1 is transferred via CMDATA15 - CMDATA8
- byte 2 is transferred via CMDATA23 - CMDATA16
- byte 3 is transferred via CMDATA31 - CMDATA24
Big endian mode selected:
-
8 bit data port (default after reset)
- byte 0 is transferred via CMDATA31 - CMDATA24
-
16 bit data port
- byte 0 is transferred via CMDATA31 - CMDATA24
- byte 1 is transferred via CMDATA23 - CMDATA16
-
32 bit data port
- byte 0 is transferred via CMDATA31 - CMDATA24
- byte 1 is transferred via CMDATA23 - CMDATA16
- byte 2 is transferred via CMDATA15 - CMDATA8
- byte 3 is transferred via CMDATA7 - CMDATA0
COMI Arbitration
5.3
The operation of two SMCS332SpW in master / slave mode is shown below:
SMCS332SpW
User Manual
– All Rights Reserved – Copyright per DIN 34 –
EADS Astrium GmbH, ASE2
Doc No: SMCS_ASTD_UM_100
Issue:
1.4
Updated: 9-Sep-2006
Page:
45 of 131
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