Phoenix MicroATX Express – Installation Guide
SMBUS
Device
Slave Address
SIO 00101101b
DIMM0
01010000b
DIMM1
01010001b
DIMM2 01010010b
DIMM3 01010011b
Clock Chip Write
11010010b
Clock Chip Read
11010011b
PCI Interrupt Routing Map
PCI Device
ID SEL
PIRQA
PIRQB
PIRQC
PIRQD
PIRQE
PIRQF
PIRQG
PIRQH
PCI Slot1
AD17
INTA
INTB INTC INTD
PCI Slot2
AD18
INTB
INTC INTD INTA
Connectors Pin-out
How to identify pin number 1: Looking to the solder side (The board side with fewer components) of the PCB
(Printed Circuit Board), pin number 1 will have a squared pad
J
. Other pins will have a circular pad
Q
.
How to identify other pins: Connectors type DB, PS/2, AT, RJ45, Power ATX and USB are industry standards. DB
connectors, for instance, are numbered sequentially. The first row is numbered in sequence (be aware that male and
female connectors are mirrored – male connectors are numbered from left to right when viewed from front and
female connectors are numbered from right to left when viewed from front). The following rows resume the
counting on the same side of pin number 1. The counting is NOT circular like Integrated Circuits (legacy from
electronic tubes).
DB9 Female
Front view
DB9 Male
Front view
5
4
3
2
1
9
8
7
6
1
z
2
z
3
z
4
z
5
z
6
z
7
z
8
z
9
z
Header connectors are numbered alternately, i.e. pin number 2 is in the other row, but in the same column of pin
number 1. Pin number 3 is in the same row of pin 1, but in the next column and so forth.
1
3
z
5
z
7
z
9
z
2
z
4
z
6
z
8
z
10
z
Header 10 pin connector
View from solder side of the PCB
Table A-9 Serial Port COM1 DB9 Connector J4A
Pin#
Serial Port COM 1 – J4A
1
DCD - RS-422/485RXB(opt.)
2
RX - RS-422/485TXB(opt.)
3
TX - RS-422/485TXA(opt.)
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9
RI – RS-422/485RXA(opt.)
42
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Summary of Contents for MicroATX Express
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