SB4002A_Data Sheet_EN

SB4002A
16
CLK
5 62
DEVSEL#
3
FRAME#
7
IRDY#
1
STOP#
4
TRDY#
Figure 2-6. Disconnect Without Data
In the above figure, a transaction is started at CLK 1, CLK 2 and CLK 3. If the burst access is
unavailable at CLK 4, the target asserts STOP#3, indicating that it will disconnect. It also deasserts
TRDY#, indicating that it will not transfer data any more. The master checks STOP# at CLK 5,
deasserts FRAME#, and then, terminates the transaction at CLK 6. In this transaction, data is
transferred at CLK 3 and CLK 4 (disconnect transaction). After that, because TRDY# is deasserted,
no more data are transferred (without data).
Target-Abort
The target terminates transaction if a critical error has occurred, or the target cannot complete the
request from the master.
Target-Abort is available when DEVSEL# is asserted. In this state, the target deasserts DEVSEL#
and asserts STOP# to terminate the transaction with Target-Abort.
FRAME#
1
CLK
2
DEVSEL#
43 6
STOP#
5
IRDY#
TRDY#
7
Figure 2-7. Target Abort