AMD Vega 10, Data Book

Page: 50 / 188

Table 3–24 Pin-based Straps
Strap Name Pin Name Power
Rail Description GPU
Default Recommended
Settings
1
BIF_VGA_DIS GPIO_15 VDDAN_33 Determine whether or
not the card will be
recognized as the
system's VGA
controller (via the
SUBCLASS field in the
PCI configuration
space).
0: VGA Controller
capacity enabled.
1: The device will not
be recognized as the
system’s VGA
controller.
0
(Internal
pull-
down)
0
Provide a pull-up
resistor option to
VDDAN_33.
ROM_CONFIG [2:0] PINSTRAP_2
PINSTRAP_1
PINSTRAP_0
VDDAN_18 If BIOS_ROM_EN = 1,
ROM_CONFIG [2:0]
defines the ROM type.
See
ROM
Configurations (p.
40)
for details.
If BIOS_ROM_EN = 0,
then ROM_CONFIG
[2:0] defines the
primary memory
aperture size. Not
applicable to "Vega
10".
101
(Internal
pull-up/
pull-
down)
101
Provide a pull-down
resistor option to
GND on the PCB for
PINSTRAP_2.
Provide a pull-up
resistor option to
1.8 V on the PCB for
PINSTRAP_1.
Provide a pull-down
resistor option to
GND on the PCB for
PINSTRAP_0.
BIOS_ROM_EN GPIO_10 VDDAN_33 Enable external BIOS
ROM device.
0: Disable external
BIOS ROM device.
Not applicable to
"Vega 10".
1: Enable external
BIOS ROM device.
Note: When an
external BIOS ROM
device is used,
GPIO_10 also
connects to the ROM
device's chip select
(active low).
1
(Internal
pull-up)
1
Provide a pull-down
resistor option to
GND on the PCB.
AMD requires
dedicated ROM for
video BIOS be used
on all "Vega 10"
designs. This strap
should be set to 1.
Special Usage [1]
Special Usage [0]
GPIO_12
GPIO_11
VDDAN_33 Special usage 0
(Internal
pull-
down)
Design dependent.
Refer to application
note order #55739
on the special
usage.
Provide a pull-up
resistor option to
VDDAN_33 on the
PCB for each pin.
38 Signal Descriptions
"Vega 10" Databook
56006_1.00
© 2017 Advanced Micro Devices, Inc.
AMD Confidential - Do not duplicate.