cExpress-AR User’s Guide
PICMG COM.0 R3.0
Page 33
Copyright © 2021 ADLINK Technology, Inc.
4.3.7
LPC bus
Name
Pin #
Description
I/O
PU / PD
Comment
LPC_AD0
LPC_AD1
LPC_AD2
LPC_AD3
B4
B5
B6
B7
LPC multiplexed address, command and data bus
I/O 3.3V
Chipset has internal PU, 50K ±30%
LPC_FRAME#
B3
LPC frame indicates the start of an LPC cycle
O 3.3V
Chipset has internal termination, 50K ±30%
LPC_DRQ0#
LPC_DRQ1#
B8
B9
LPC serial DMA request
I 3.3V
LPC_DRQ1 is not connected
LPC_SERIRQ
A50
LPC serial interrupt I/O
3.3V
Chipset
has internal PU, 50K ±30%
LPC_CLK
B10
LPC clock output –33MHz nominal
O 3.3V
The LPC_CLK frequency is 33MHz on this platform