TCP872 V1.0 User Manual Issue 1.1
Page 15 of 16
4.4 Multifunction Pins
The PCI1520 provides several multifunction pins. On the TCP872 these multifunction pins are used for
EPROM access, PCI INTA interrupt signaling and other purposes. The multifunction pins can be
programmed to other functions by software. To provide access to the multifunction signals of the
PCI1520, the TCP872 provides a 10 pin flat cable header:
Figure 4-4 : Position of X2
X2
Signal
Default Function
Pin 1 (square pad)
MFUNC5
activity LED Socket 0
Pin 2
SPKROUT
-
Pin 3
MFUNC6 / CLKRUN#
-
Pin 4
MFUNC3 / IRQSER
-
Pin 5
RI_OUT# / PME#
-
Pin 6
MFUNC1
SDA
Pin 7
MFUNC2
activity LED Socket 1
Pin 8
MFUNC4
SCL
Pin 9
3,3V or 5V
-
Pin 10
GND
GND
Figure 4-5 : X2 Signal Assignment
