VAR-320SBC Reference Guide
Copyright © 2008 Variscite
4.9. PWM
The VAR-320SBC outputs 2 of the 4 PXA320 processor’s pulse-width modulator (PWM) pins.
Each can be configured to generate periodic output signals. Configuration of the PWMs is
accomplished through software and is described in detail in Marvell® PXA320 Processor Serial
Controller Configuration Developers Manual, Vol. IV, “Section 9:Pulse-Width Modulator
Controller”.
Signal Pin number Type Description
GPIO
PWM_0 P2-4
O
Pulse-width modulated output signal 11
PWM_1 P1-108
O
Pulse-width modulated output signal 12
23
4.10. Ethernet
port
The VAR-320SBC integrates one full-featured 10/100 Mbit Ethernet interface using Davicom
DM9000B Ethernet controller.
Features:
•
Fully compliant with IEEE 802.3/802.3u standards
•
Integrated
Ethernet MAC and PHY
•
10BASE-T and 100BASE-TX support
•
Full- and Half-duplex support
•
Full-duplex flow control
•
Backpressure for half-duplex flow control
•
Preamble generation and removal
•
Automatic 32-bit CRC generation and checking
•
Automatic payload padding and pad removal
•
Auto-negotiation
•
Automatic polarity detection and correction
Signal
Pin number
Type Description
TPI_N
P1-3
I
Ethernet Twisted Pair Receive Negative
TPI_P
P1-1
I
Ethernet Twisted Pair Receive Positive
TPO_P
P1-2
O
Ethernet Twisted Pair Transmit Positive
TPO_N
P1-4
O
Ethernet Twisted Pair Transmit Negative
nLINK_ACK
P1-6
O
LED, Activity Indicator
nSPD_100
P1-5
O
LED, Speed Indicator
AGND P1-8,10,12
O
Analog
GND for Ethernet magnetics
ETH_V_1P8V P1-16,18,20 O
Analog 1.8v supply for Ext. Ethernet magnetics