Table 16: Miscsr2 – Misc. Control Register #2 - VersaLogic Viper Programmer's Reference Manual

FPGA Registers
Table 16: MISCSR2 – Misc. Control Register #2
Bit Identifier
7 USB_HUBMODE
6 W_DISABLE
5 ETHOFF1
4 ETHOFF0
3 Reserved
2 USB_HUBDIS
1 USB_PBDIS
0 USB_OBDIS
22
Access Default
Determines whether the hub resets only once (to support wake-up from
sleep modes on USB ports) or resets every time it enters sleep modes
using the platform reset:
R/W
0
0 – USB hub is reset once at power on. Use USB_HUBDIS to manually
control the reset if necessary. This supports USB wake-up modes
1 – USB hub is reset by platform reset every time (will be reset when
entering all sleep modes). USB ports cannot be used to wake-up
Used to control the W_DISABLE (Wireless Disable) signal going to the
PCIe Minicard:
0 – W_DISABLE signal is not asserted (Enabled)
R/W
0
1 – W_DISABLE signal is asserted (Disabled)
Note: There are other control sources that can be configured to control
this signal and if enabled the control becomes the "OR" of all sources
Used to disable the Ethernet controller #1 (controls the ETH_OFF#
input to the I210-IT):
R/W
0
0 – Ethernet controller is enabled (On)
1 – Ethernet controller is disabled (Off)
Used to disable the Ethernet controller #0 (controls the ETH_OFF#
input to the I210-IT):
R/W
0
0 – Ethernet controller is enabled (On)
1 – Ethernet controller is disabled (Off)
RO
0 Reserved – Writes are ignored. Reads always return 0.
Control the reset on the USB251xB Hubs.
R/W
0's 0 – USB251xB Hubs are Enabled (reset released)
1 – USB251xB Hubs are in Reset
Disable control for the paddleboard USB port VBUS power switches
(there are two power-switches but they have a common power enable
and overcurrent status)
0 – VBUS power switches are enabled
R/W
0
1 – VBUS power switched are disabled.
Note: The power switches latch-off in overcurrent and can only be re-
enabled by a power-cycle or by setting this bit to a 1, wait >1 ms, and
then a 0
Disable control for the on-board USB port VBUS power switches (there
are two with a common overcurrent):
0 – VBUS power switches are enabled
R/W
0 1 – VBUS power switched are disabled.
Note: The power switches latch-off in overcurrent and can only be re-
enabled by a power-cycle of by setting this bit to a 1 and then a 0 with
at least 1 ms in between
Description
VL-EBX-38 Programmer's Reference Manual