16-12
MB86R02 ‘Jade-D’ Hardware Manual V1.64
16.5.1.4.3. The first CMD is a dummy command
When the first CMD is a dummy write, the STATUS byte is immediately returned. The status is
different depending on whether a READ or WRITE is returned. At this point in time, the
transaction is not issued to the AHB. After the STATUS byte replies, this forwarding transaction
is completed.
16.1.1.1.1
When the first CMD is a dummy Write (R/W bit=WRITE)
TxRDY is sent back for dummy WRITE CMD. Refer to Figure
Error! No text of specified style
in document.
Dummy Write
(WriteSts
1
)
HOST DO
CMD
HOST SCK
HOST XCS
HOST DI
STATUS
Dummy Write! (Write)
Rx
RDY
Tx
RDY
SERR
ABL1 ABL0 DBL2 DBL1 DBL0 R/W CNT1 CNT0
Write
WriteSts
1
x
0
0
0
0
1
0
x
0
1
1
0
1
1
1
1
Figure 16-17 Dummy Write (R/W bit=WRITE)
16.1.1.1.2
When the first CMD is a dummy Read (R/W bit=Read)
RxRDY is sent back for dummy READ CMD. Refer to Figure
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in document.
(ReadSts
1
)
HOST DO
CMD
HOST SCK
HOST XCS
HOST DI
STATUS
Dummy Write! (Read)
Dummy Write
Rx
RDY
Tx
RDY
SERR
ABL1 ABL0 DBL2 DBL1 DBL0 R/W CNT1 CNT0
Read
ReadSts1
x
0
0
0
0
0
0
x
0
1
1
0
1
1
1
1
Figure 16-18 Dummy Read (R/W bit= READ)
16.5.1.4.4. The first CMD is a reset request
If the first CMD is a dummy RESET command, the HOSTIF module is reset at once although the
response has begun. Please send the reset frame after the reset request.
Содержание MB86R02
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Страница 304: ...16 5 MB86R02 Jade D Hardware Manual V1 64 The flow of a read action is shown below Figure 16 5 Read process flow ...
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