Critical Link, LLC
www.CriticalLink.com
MityARM-335x Development Kit
www.MityDSP.com
12 April 2013
5
Copyright © 2007-2013, Critical Link LLC
RS-232 Interface Description
The on-board RS-232 level driver provides a standard serial interface at data rates up to
115,200 baud. The serial interface, J507, is routed to the primary MityARM serial
bootloading port, UART0, in order to allow remote code download and FLASH upgrades
on an attached MityARM from this connector.
Dual UART Expansion Port Description
The dual UART expansion ports each contain a set of TX and RX connections as well as
an enable GPIO from the MityARM-335x module. A custom user designed driver board
can be designed to provide any desired signaling or you can select an off-the-shelf
solution available from Critical Link for RS232 and RS485/422 drivers. Each MityARM-
335x Development includes both a RS232 and RS485/422 driver expansion kits, Table
18.
The electrical interfaces are provided via J505 and J506, 10-pin shrouded headers. HW
flow control is not supported on these interfaces.
Linux Driver and API examples are available to support the UART functionality.
Audio Input/Output Description
Standard 3.5mm / 1/8
th
inch audio jacks are provided for both stereo audio output and a
microphone audio input from/to a TLV320AIC26 16-bit audio CODEC connected to the
MityARM-335x module.
The electrical interfaces are provided via 1/8
th
inch jacks J300, Audio Out, and J301,
Microphone In.
Linux Driver and API examples are available to support the audio functionality.
USB 2.0 Interface Description
The on-board USB interface utilizes dedicated HOST, A type connector J502, and OTG,
mini B type connector J500, controllers inside Sitara processor. Linux drivers are
available.
MultiMedia Card (SD) Interface Description
The on-board MultiMedia Card (MMC) slot uses a Secure Digital connector J501 which
supports standard (3.3V) and SDHC (1.8V) cards up to 32GB. U-Boot configuration
information and Linux drivers are available.
Gigabit Ethernet Interface Description
The on-board Ethernet interface features a network PHY capable of running at
10/100/1000Mbit including link auto-negotiation and MII/MDIO capability. An industry
standard RJ-45 connector is provided for external connection. This Ethernet interface
may be used to perform remote code download via U-Boot and FLASH upgrades on an
attached MityARM-335x module.
