2.2 FT8U100AX - Pinout Description
Pin
Number(s)
22,21
25,24
4,3
7,6
10,9
13,12
16,15
19,18
34-37,39,40
Signal
Name
UP1+, UP1-
DN1+, DN1-
DN2+, DN2-
DN3+, DN3-
DN4+, DN4-
DN5+, DN5-
DN6+, DN6-
DN7+, DN7-
PWR1# to
PWR7#
OVL1# to
OVL7#
P1D0 to P1D7,
P2D0 to P2D6,
P3D0 to P3D6,
P4D0 to P4D6,
P5D0 to P5D5
SPTX, SPRX
IRTX, IRRX
CRTX,
CRXL,CRXH
KCLK, KDAT
MCLK, MDAT
SCL,SDA
INT#
FTIR
RA0 to RA14
I/O
USB I/O
USB I/O
Signal Description
Differential USB port Connection to Upstream System or Hub
Differential USB port Connection to Downstream Peripherals or
Hubs
I/O
26-31,33
I/O
84-88, 90-92
93, 95-99,23
26-31,33
34-37,39-41
42,43,45-48
42,43
97,98
93,96,95
46,45
48,47
99,23
49
92
64,66,68,71,73,
75,77,79,78,76,
69,74,81,80,82
56,54,52,51,
53,55,62,65
72,67,50
61
2,3
1
58
I/O
Active Low Power Enable output pin to each USB Port. These
signals connect to the gate input of a Power MOSFET or Power
Control Switch I.C.
Active Low Current Overload Detect Input from each USB Port.
Pulling these signals low remove the power to the faulty USB
device and notifies the system of this event.
General Purpose IO Ports used for controlling LED status
indicators etc. Some of these pins are multiplexed with other
embedded functions – see Pinout Configuration
I/O
I/O
I/O
I/O
I/O
I/O
I/O
O
Transmit / Receive Data for Serial Port 1
Transmit / Receive Data for Serial Port 2 and IrDA SIR
Transmit / Receive Data for Serial Port 3 and IrDA CIR
PS/2 Keyboard interface signals
PS/2 Mouse interface signals
Monitor Control port clock and data signals.
Ir Remote Control Receiver Port
Program Address Bus from the internal EMCU micro-controller.
These connect to the address pins on an external ROM.
Program Data Bus from the internal EMCU micro-controller. These
connect to the address pins on an external ROM.
Output Enable, Write Enable and Chip Enable control signals (
active low ) for the external ROM.
Oscillator Re-Start Timer RC network. This gates off the oscillator
internal to the chip until the Oscillator circuit has become stable.
For IC Test Purpose Only – Strap to GND
For FTDI In-Circuit Debugger Use Only – Strap to GND for normal
operation.
Strapped to XTIN for Bus powered applications – used to shut
down the oscillator circuit during suspend by clamping the input to
ground.
48MHz Crystal Oscillator Input / Output Pins
Active Low Chip Reset Pin
+3.3 Volt Supply Voltage
Ground Pin
RD0 to RD7
ROE#, RWE#,
RCE#
RCCLK
TEST
RST8K
CLMP#
I/O
O
O
I
I
I
59,60
100
14,17,44,70,94
8,11,20,32,38,
57,63,83,89
XTIN, XTOUT
RST#
VCC3
GND
I,O
I
VCC
GND
The FT8U100AX contains six general purpose I/O ports which are firmware configurable. These support LED status
control, USB overload current detect, per port USB power enable functions as well as internal legacy peripherals
including serial port, PS/2 keyboard and mouse. The pinout diagram on the preceding page details the designation of
these I/O ports for one specific configuration of the FT8U100AX, as used with the UH8370 USB Hub reference design.
Future Technology Devices Intl.
FT8U100AX Product Data Rev 0.90
Page
7
FTDI [ FUTURE TECHNOLOGY DEVICES INTERNATIONAL LTD. ]
