Software • BIOS options
Chapter 4 Software
Panel PC 900 User's Manual V1.05
197
1.4.4.1 PCI Express settings
Figure 138: Advanced - PCI Express configuration - PCI Express settings
BIOS setting
Function
Configuration options
Effect
Disabled
Disables this function
Relaxed ordering
Option for enabling/disabling relaxed ordering
Enabled
Enables this function
Disabled
Disables this function Only 5 bits can be used.
Extended tag
Option for enabling/disabling the extended tag
Enabled
Enables this function Devices with 8 bits in the
requester transaction ID field can be used.
Disabled
Disables this function
No snoop
Option for enabling/disabling the "No snoop" op-
tion
Enabled
Enables this function
Auto
Automatically assigns the packet size
Maximum payload
Option for setting the maximum surface packet
size for data transfers
128 bytes to 4096 bytes
Manual maps the packet size
Auto
Automatic assignment
Maximum read request
Option for setting the maximum read request
128 bytes to 4096 bytes
Manual assignment
Disabled
Disables the energy saving function
Auto
Maximum energy savings. The energy saving
function is set to L0 or L1.
ASPM
1)
Option for configuring a power saving function
(L0s/L1) for PCIe slots if they do not require full
power
Force L0s
Enables L0 mode
Disabled
Disables this function
Extended synch
Option for setting an extended synchronization
pattern to improve system performance
Enabled
Enables this function
Disabled
Disables this function
2
2 link training attempts
3
3 link training attempts
Link training retry
Option for defining the number of times the soft-
ware should attempt to reroute a link if the previ-
ous training attempt was unsuccessful
5
5 link training attempts
Link training timeout (µS)
Option for defining how many microseconds the
software waits before the link training bit in the
link status register is queried
10 to 1000
Time setting in µs
Keep link on
Keeps PCIe slots where no devices are con-
nected enabled
Unpopulated links
Option for enabling/disabling PCIe slots where
no devices are connected
Disable link
Disables PCIe slots where no devices are con-
nected to save power
Table 171: Advanced - PCI Express configuration - PCI Express settings - Configuration options
1)
ASPM = Active state power management.
