Multi-purpose I/O
EBX-38 Hardware Reference Manual
28
PCI
E
M
INI
C
ARD
LED
S
The Mini Card specification states that there are three LED outputs: WWAN, WLAN and
WPAN. There are on-board LEDs for each of these. A fourth LED is used to indicate when the
Mini Card is powered (since the Mini Card power can be configured to either be always-on or on
in S0). This indicator is very important as a warning to NOT hot-plug the Mini Card (otherwise
it might appear it is OK when the board is in a sleep mode but the Mini Card is still powered); as
a result, it is intentionally yellow to indicate “caution”.
Table 12: PCIe Mini Card LED States
LED
Ref Des
State
Description
Green (WWAN)
D8 (Mini0)
D23 (Mini1)
On
WWAN active
Off
WWAN inactive
Yellow (WLAN)
D8 (Mini0)
D23 (Mini1)
On
WLAN active
Off
WLAN inactive
Green (WPAN)
D9 (Mini0)
D24 (Mini1)
On
WPAN active
Off
WPAN inactive
Yellow
(Power On)
D9 (Mini0)
D24 (Mini1)
On
Mini Card Power is On
Off
Mini Card Power is Off
Integrator’s Note:
The 3.3 V power to the Mini Card can be controlled by the FPGA. By default, the power is always
on, but there is a register setting that turns this power off in sleep modes. The Mini Card 1.5 V
power is always turned off in sleep modes.
Figure 14. Location of PCIe Mini Card LEDs
