AXIOMTEK MMB501, User Manual

Page: 27 / 67

MMB501 LGA1151 ATX Motherboard
Board and Pin Assignments 21
2.4.13 Internal USB Headers (CN17 and CN24~CN25)
The CN17 is Type-A 180D Connector for USB2.0 signal.
These are 5x2-pin p=2.54mm headers, support two USB 2.0 signal for CN24~CN25.
2.4.14 SPI interface for TPM module (CN26)
These are 7x2-pin p=2.0mm headers for SPI interface with AX93515 TPM module.
2.4.15 COM1 Connector (COM1)
This is a high rise 9-pin D-Sub connector for COM1 serial port interface. The pin
assignments of RS-232/422/485 are listed in table below.
Pin Signal
1 +5 V_DUAL
2 USB-
3 USB+
4 GND
Pin Signal Pin Signal
1 +5 V_DUAL 2 +5 V_DUAL
3 USB- 4 USB-
5 USB+ 6 USB+
7 GND 8 GND
10 N/C
Pin Signal Pin Signal
1 VCC3P3 2 GND
3 MOSI 4 MISO
5 CLK 6 CS2
7 RST 8 PIRQ
9 PP
12 NC
13 NC 14 MC
Pin RS-232
[*]
RS-422
[*]
RS-485
[*]
1 DCD#
[**]
TX- 485-
2 RXD TX+ 485+
3 TXD RX+ N/C
4 DTR# RX- N/C
5 GND GND GND
6 DSR# N/C N/C
7 RTS# N/C N/C
8 CTS# N/C N/C
9 RI#
[**]
N/C N/C