After the STP connection is established, the host and
device are just following normal SATA protocol; frame transmission can go in
either or both directions during the connection. X_RDY and R_RDY are
used to coordinate frame transmission. If both want to send a frame, they
both send X_RDY. The host always defers in this case and sends R_RDY,
allowing the device to send its frame first. The host can try again after
that frame is finished.
---
Rob Elliott, HP Industry Standard Server
Storage
Hi,
I've seen a
situation where a STP Initiator opens a connection to STP Target/SATA Bridge.
The STP Target sends back OPEN Accept and then starts sending DATA or DMA Setup
or DMA Activate FISs. As per SAS-2:
7.12.2.1 Connection request
The OPEN address frame (see 7.8.3) is used to open a connection
from a source port to a destination port
using one source phy and one destination
phy.
If the STP Target is
the Source Port shouldn't the connection be opened from the STP Target? Is it
acceptable the STP Initiator to open a connection if the STP Target will be the
source port?
Thanks,
Marian
________________________
Marian
Lakov
Systems
Engineer
Xyratex
1804 Centre Point Circle, Suite
#112
Naperville, IL 60563
Office: 630-364-7600
Fax:
630-364-7601