ASROCK B450M Steel Legend Manual page 31

Power LED and Speaker
Header
(7-pin SPK_PLED1)
(see p.1, No. 14)
Serial ATA3 Connectors
(SATA3_1:
see p.1, No. 12) (Upper)
(SATA3_2:
see p.1, No. 11) (Lower)
(SATA3_3:
see p.1, No. 9) (Upper)
(SATA3_4:
see p.1, No. 10) (Lower)
USB 2.0 Headers
(9-pin USB_3_4)
(see p.1, No. 20)
(9-pin USB_5_6)
(see p.1, No. 19)
USB 3.2 Gen1 Header
(19-pin USB3_56)
(see p.1 or 8, No. 8)
Front Panel Audio Header
(9-pin HD_AUDIO1)
(see p.1, No. 25)
SPEAKER
DUMMY
DUMMY
+5V
1
PLED+
PLED+
PLED-
USB_PWR
P-
P+
GND
DUMMY
1
GND
P+
P-
USB_PWR
Vbus Vbus
Vbus IntA_PB_SSRX-
IntA_PA_SSRX- IntA_PB_SSRX+
IntA_PA_SSRX+ GND
GND IntA_PB_SSTX-
IntA_PA_SSTX- IntA_PB_SSTX+
IntA_PA_SSTX+
GND
GND IntA_PB_D-
IntA_PA_D- IntA_PB_D+
IntA_PA_D+ Dummy
1
GND
PRESENCE#
MIC_RET
OUT_RET
1
OUT2_L
J_SENSE
OUT2_R
MIC2_R
MIC2_L
B450M Steel Legend
Please connect the
chassis power LED and
the chassis speaker to this
header.
These four SATA3
connectors support SATA
data cables for internal
storage devices with up to
6.0 Gb/s data transfer rate.
* M2_2 and SATA3_3
share lanes. If either one
of them is in use, the other
one will be disabled.
There are two headers
on this motherboard.
Each USB 2.0 header can
support two ports.
There is one header on
this motherboard. Each
USB 3.2 Gen1 header can
support two ports.
This header is for
connecting audio devices
to the front audio panel.
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