Analog Devices ADSP-SC58 Series Hardware Reference Manual page 1808

ADSP-SC58x PCIE Register Descriptions
Table 29-47: PCIE_DEV_CAPB2_[n] Register Fields
Bit No.
(Access)
19:18 OBFF
(R/NW)
13 TC1
(R/NW)
12 TC0
(R/NW)
11 LTR
(R/NW)
10 NRENP2P
(R/NW)
29–104
Bit Name
Cap OBFF Support.
The PCIE_DEV_CAPB2_[n].OBFF bit field indicates if OBFF (Optimized Buffer
Flush/Fill) is supported and, if so, what signaling mechanism is used. The value report-
ed in this field must indicate support for WAKE# signaling only if:
• For a Downstream Port, driving the WAKE# signal for OBFF is supported and the
connector or component connected Downstream is known to receive that same
WAKE# signal
• For an Upstream Port, receiving the WAKE# signal for OBFF is supported and, if
the component is on an add-in-card, that the component is connected to the
WAKE# signal on the connector.
Root Ports, Switch Ports, and Endpoints are permitted to implement this capability.
For Bridges and Ports that do not implement this capability, this field must be set to
00.
TLP Processing Hints Complete Support 1.
The PCIE_DEV_CAPB2_[n].TC1 bit indicates Completer support for TPH or
Extended TPH. Applicable only to Root Ports and Endpoints. For all other Functions,
this field is Reserved.
TLP Processing Hints Complete Support 0.
The PCIE_DEV_CAPB2_[n].TC0 bit indicates Completer support for TPH or
Extended TPH. Applicable only to Root Ports and Endpoints. For all other Functions,
this field is Reserved.
Latency Tolerance Reporting.
The PCIE_DEV_CAPB2_[n].LTR bit indicates indicates support for the optional
Latency Tolerance Reporting (LTR) mechanism. Root Ports, Switches and Endpoints
are permitted to implement this capability. For Bridges and other Functions that do
not implement this capability, this bit must be set to 0.
No Routing Element peer-to-peer.
If the PCIE_DEV_CAPB2_[n].NRENP2P bit is set, the routing element never car-
ries out the passing that is associated with the Relaxed Ordering Attribute field being
Set. This bit applies only for Switches and RCs that support peer-to-peer traffic be-
tween Root Ports. The PCIE_DEV_CAPB2_[n].NRENP2P bit applies only to
Posted Requests being forwarded through the Switch or Root-Complex and does not
apply to traffic originating or terminating within the Switch or Root-Complex itself.
All Ports on a Switch or Root-Complex must report the same value for this bit. For all
other functions, this bit must be 0.
ADSP-SC58x/ADSP-2158x SHARC+ Processor Hardware Reference
Description/Enumeration
0 Not supported
1 Supported using Message signaling only
2 Supported using WAKE# signaling only
3 Supported using WAKE# and Message signaling