1.9.3.3 Spi Data Information Unit; Table 1.28 Spi Data Information Unit; Table 1.29 Spi Data Stream Information Unit - Fujitsu MAW3073 SERIES Specifications

1.9.3.3 SPI data information unit

The SPI data information unit (see table 1.28) contains data.
The detection of a BUS FREE phase following a SPI data information unit by an INIT shall be
equivalent to the INIT receiving a DISCONNECT message.
The detection of a QAS REQUEST message following a SPI data information unit by a INIT shall
be equivalent to the INIT receiving a DISCONNECT message.
Bit
7
Byte
0
N
N+1 (MSB)
N+2
N+3
N+4
The DATA field may contain any type of information (e.g., parameter lists, mode pages, user
data).
If the IUCRC INTERVAL field of the SPI L_Q information unit contains a value greater than zero
and less than the data length then there is an IUCRC field at each iuCRC interval in addition to the
iuCRC shown in table 1.28. These additional IUCRC fields are not shown in table 1.28.
1.9.3.4 SPI data stream information unit
The SPI data stream information unit (see table 1.29) contains data.
All the SPI data stream information units transferred after a SPI L_Q information unit with a type
of data stream shall be the size indicated in the DATA LENGTH field of the SPI L_Q information
unit.
If the data transfer size is not a multiple of the data length, the TARG ends the stream at a data
length boundary and sends a new SPI L_Q with a smaller data length to finish the data transfer.
The new SPI L_Q may or may not be sent during the current physical connection.
During write streaming the sequence of SPI data stream information units shall end with any
change to the C/D, I/O, or MSG signals on a SPI data stream information unit boundary. If during
write streaming SPI data stream information units an INIT detects a REQ transition after
transmitting the last iuCRC for a SPI data stream information unit that INIT shall transmit the next
SPI data stream information unit.
During read streaming the TARG ends a sequence of SPI data stream information units by
performing one of the following:
a) should assert the P_CRCA signal before the end of the current SPI data stream
information unit boundary; or
C141-C011
Table 1.28 SPI data information unit
6 5 4 3 2
DATA
IUCRC
1 0
(LSB)
1-119