IDT Non-Transparent Mode Operation
PES16NT2 User Manual
10 - 2
April 15, 2008
Notes
Figure 10.1 PES16NT2 Functional Block Diagram in Non-Transparent Mode
In a transparent switch, link registers in the downstream port of a switch correspond to the link associ-
ated with the downstream port. In the case of the non-transparent port, there is a virtual internal and
external endpoint beneath the PCI-PCI bridge associated with the downstream port; however, the link capa-
bilities still refer to the link associated with the downstream port of the switch (i.e., the external physical port
C link).
Similar to the mapping of PCI express link and slot capabilities to the external port C link, the Phy layer
and data link layer control and status registers in the port C configuration space refer to the phy and data
link layer associated with the external side of the non-transparent bridge (i.e., that associated with physical
port C link). The transaction layer, route map table and switch integrity control and status registers in the
port C configuration space are still associated with the port C PCI-PCI bridge.
The connection between the port C PCI-PCI bridge and the internal endpoint associated with the non-
transparent bridge is an on-chip virtual PCIe link. The link capabilities, control and status registers of a
device reflect the state of the link connection of the device to the upstream port of a switch or a root
complex. Therefore, in the internal non-transparent bridge endpoint these registers reflect the “virtual” state
of this on-chip connection. On the external non-transparent bridge endpoint, these registers reflect the
actual state of physical link associated with port C and mirror the values of the corresponding fields in the
port C PCI-PCI bridge.
Type 1
Configuration Header
PCI-PCI
Transparent
Bridge
Virtual PCI Bus
Port A
(Upstream Port)
Port C
(Non-Transparent Port)
Type 1
Configuration Header
PCI-PCI
Transparent
Bridge
Internal Type 0
Configuration Header
Non-Transparent
External Type 0
Configuration Header
Bridge
PCI Express Link
Capabilities, Control, Status
&
PCI Express Slot
Capabilities, Control, Status
Virtual
PCIe Link
Содержание 89HPES16NT2
Страница 14: ...DT List of Figures PES16NT2 User Manual viii April 15 2008 Notes...
Страница 20: ...IDT Register List PES16NT2 User Manual xiv April 15 2008 Notes...
Страница 32: ...IDT PES16NT2 Device Overview PES16NT2 User Manual 1 12 April 15 2008 Notes...
Страница 44: ...IDT Clocking Reset and Initialization Clock Operation PES16NT2 User Manual 2 12 April 15 2008 Notes...
Страница 50: ...IDT Link Operation PES16NT2 User Manual 3 6 April 15 2008 Notes...
Страница 62: ...IDT Power Management PES16NT2 User Manual 5 4 April 15 2008 Notes...
Страница 78: ...IDT SMBus Interfaces PES16NT2 User Manual 6 16 April 15 2008 Notes...
Страница 83: ...IDT NTB Upstream Port Failover PES16NT2 User Manual 7 5 April 15 2008 Notes...
Страница 84: ...IDT NTB Upstream Port Failover PES16NT2 User Manual 7 6 April 15 2008 Notes...
Страница 130: ...IDT Transparent Mode Operation PES16NT2 User Manual 9 44 April 15 2008 Notes...
Страница 284: ...IDT Non Transparent Mode Operation PES16NT2 User Manual 10 154 April 15 2008 Notes...