EMAC SoM-A5D36 User Manual

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Page 1

SoM-A5D36

User Manual

April 2019

Revision 1.30

EMAC, Inc.

2390 EMAC Way, Carbondale, Illinois 62902 Phone: (618) 529-4525 Fax: (618) 457-0110 http://www.emacinc.com

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SoM-A5D36 User Manual

Table of Contents

1 Introduction ........................................................................................................................................................... - 4 -

1.1 .... Features ............................................................................................................................................................................. - 4 -

2 Hardware ................................................................................................................................................................ - 5 -

2.1 .... Specifications .................................................................................................................................................................. - 5 -

2.2 .... Real-Time Clock .............................................................................................................................................................. - 7 -

2.3 .... Watchdog Timer ............................................................................................................................................................ - 7 -

2.4 .... External Connections ................................................................................................................................................... - 7 -

2.4.1 External Bus .............................................................................................................................................................................. - 8 -

2.4.2 JTAG ............................................................................................................................................................................................. - 9 -

2.4.3 One-Wire / I2C ......................................................................................................................................................................... - 9 -

2.4.4 Ethernet ................................................................................................................................................................................... - 10 -

2.4.5 USB ............................................................................................................................................................................................ - 11 -

2.4.6 SPI .............................................................................................................................................................................................. - 12 -

2.4.7 MCI Multimedia Card ......................................................................................................................................................... - 13 -

2.4.8 Serial Ports .............................................................................................................................................................................. - 14 -

2.4.9 I2S .............................................................................................................................................................................................. - 15 -

2.4.10 CAN .................................................................................................................................................................................... - 15 -

2.4.11 GPIO .................................................................................................................................................................................. - 16 -

2.4.12 Interrupts ......................................................................................................................................................................... - 17 -

2.4.13 ADC .................................................................................................................................................................................... - 17 -

2.4.14 Timer/Counters ............................................................................................................................................................. - 18 -

2.4.15 SoM Status LED.............................................................................................................................................................. - 18 -

2.4.16 LCD ..................................................................................................................................................................................... - 19 -

2.4.17 Additional Interfaces ................................................................................................................................................. - 20 -

2.5 .... Power Connections ..................................................................................................................................................... - 21 -

2.6 .... Boot Options .................................................................................................................................................................. - 21 -

2.7 .... Serial Data Flash .......................................................................................................................................................... - 22 -

3 Design Considerations ...................................................................................................................................... - 22 -

3.1 .... Off-the-Shelf Carriers ................................................................................................................................................. - 22 -

3.1.1 SoM-200GS ............................................................................................................................................................................. - 22 -

3.1.2 SoM-250GS ............................................................................................................................................................................. - 23 -

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SoM-A5D36 User Manual

3.2 .... Semi-Custom Carriers .............................................................................................................................................. - 23 -

3.3 .... Designing Your Own Carrier ................................................................................................................................. - 23 -

3.3.1 Power ...................................................................................................................................................................................... - 23 -

3.3.2 Analog Reference ............................................................................................................................................................... - 24 -

3.3.3 Battery Backup .................................................................................................................................................................... - 24 -

3.3.4 Shutdown Logic Pins ........................................................................................................................................................ - 24 -

4 Software ................................................................................................................................................................ - 25 -

4.1 .... Das U-Boot ..................................................................................................................................................................... - 25 -

4.2 .... Embedded Linux ........................................................................................................................................................... - 25 -

4.2.1 Linux with Xenomai Real Time Extensions .................................................................................................................. - 25 -

4.2.2 Linux Packages ...................................................................................................................................................................... - 26 -

4.2.3 Linux Patches ......................................................................................................................................................................... - 26 -

4.3 .... Qt Creator ....................................................................................................................................................................... - 26 -

4.4.... ARM EABI Cross Compiler ................................................................................................................................... - 26 -

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SoM-A5D36 User Manual

Disclaimer

EMAC Inc. does not assume any liability arising out of the application or use of any of its products or designs. Products designed or distributed by EMAC Inc. are not intended for, or authorized to be used in, applications such as life support systems or for any other use in which the failure of the product could potentially result in personal injury, death or property damage.

If EMAC Inc. products are used in any of the aforementioned unintended or unauthorized applications, Purchaser shall indemnify and hold EMAC Inc. and its employees and officers harmless against all claims, costs, damages, expenses, and attorney fees that may directly or indirectly arise out of any claim of personal injury, death or property damage associated with such unintended or unauthorized use, even if it is alleged that EMAC Inc. was negligent in the design or manufacture of the product.

EMAC Inc. reserves the right to make changes to any products with the intent to improve overall quality, without further notification.

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SoM-A5D36 User Manual

1 Introduction

This document describes EMAC’s SoM-A5D36 System on Module (SoMs). The SoM-A5D36 is a System on Module, designed to be compatible with EMAC’s 200-pin SODIMM form factor. This module is built

around the ATSAMA5D36 ARM based microcontrollers, which provides several of its key features. The SoM-A5D36 has an onboard Gigabit Ethernet PHY, 6 serial ports, an RTC, onboard eMMC flash, Serial NOR Flash, and SDRAM. In addition to the standard SoM features, the SoM-A5D36 also features a fast 32-bit core, open source software support, and a wide range of controller I/O pins.

1.1 Features

▪ Small, 200 pin SODIMM form factor (2.66" x 2.384")

▪ Atmel ARM Cortex-A5 ATSAMA5D36 536MHz Processor ▪ 10/100/1000 BaseT Ethernet with on-board PHY ▪ RMII Interface for additional 10/100 BaseT PHY ▪ 6 Serial ports, one with full handshake and 3 with RTS/CTS handshake ▪ 2 USB 2.0 (High Speed) Host port ▪ 1 USB 2.0 (High Speed) OTG Host/Device port ▪ Up to 512 MB of LPDDR2 SDRAM ▪ 4 GB of eMMC Flash ▪ 16 MB of NOR Serial Flash ▪ 2 SD/MMC Flash Card Interfaces ▪ Battery-backed Real-Time Clock ▪ 2 SPI ports ▪ 2 I2C ports ▪ 1 I2S Audio port ▪ 2 CAN ports ▪ 6-Channel 12-bit Analog-to-Digital converter with 4-wire Touchscreen Interface ▪ Image Sensor Interface (ISI), ITU-R BT. 601/656 ▪ Timer/Counters and Pulse Width Modulation (PWM) ports ▪ Graphic LCD Interface with 2D acceleration with 2048x2048 Resolution or up to 720p

▪ 32-bit True Random Number Generator

▪ Typical power requirement less than 1 Watt

▪ JTAG for debug, including real-time trace ▪ FREE Qt Creator IDE with GCC & GDB development tools

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SoM-A5D36 User Manual

2 Hardware

2.1 Specifications

▪ CPU: Embedded Atmel ATSAMA5D36 processor running at 536MHz

▪ Flash: 4GB eMMC Flash and 16MB of Serial Data Flash.

▪ RAM: 512 MB 133 MHz LPDDR2.

▪ Flash Disk: 4-bit SDHC/MMC interface.

▪ System Reset: Supervisor with external Reset Button provision.

▪ RTC: Real-Time Clock/Calendar with battery-backed provision using 32-bit free-running counter.

▪ Timer/Counters: 5, 2-channel, 32-bit timers/counters with capture, compare, and PWM.

▪ PWM: 4 PWM channels, one with complimentary outputs.

▪ Watchdog Timer: External Watchdog Timer (MAX6747).

▪ Digital I/O: 32 General Purpose I/Os with 16 mA drive when used as an output

▪ Analog I/O: 6-channel, 12-bit Analog-to-Digital converter (ADC) ▪ Power: Power Management Controller allows selectively shutting down on-processor I/O

functionality and running from a slow clock.

▪ JTAG: JTAG for debug, including real-time trace.

▪ CLOCKS: PLL synthesized 8MHz, 200KHz, 14.3MHz clock outputs

Serial Interfaces

▪ UARTS: 6 serial TTL level serial ports with Auto RS485 and most with handshaking

(each UART requires external RS level shifting).

▪ SPI: 2 High-Speed SPI ports with Chip Selects. ▪ Audio: I2S Synchronous Serial Controller with analog interface support ▪ USB: Dual USB 2.0 High Speed Host and single USB 2.0 High Speed Device ports ▪ I2C: Two I2C ports

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SoM-A5D36 User Manual

Ethernet Interface

▪ MAC: ATSAMA5D36 on chip MAC ▪ PHY: Micrel KSZ9031 Gigabit PHY with software shutdown. ▪ Interface: IEEE 802.3u 10/100/1000 BaseT Fast Ethernet (requires external magnetics and Jack)

Bus Interface:

▪ Local Bus accessible through SODIMM provides 22 address lines, 16 data bus lines, and control

lines.

Mechanical and Environmental

▪ Dimensions: SODIMM form factor with the length dimension extended (2.66" x 2.384") ▪ SODIMM TYPE: 200 Pin DDR1 (not compatible with DDR2) ▪ Power Supply Voltage: +3.3 Volts DC +/- 5% ▪ Power Requirements (Typical):

▪ 3.3 Volts @ 300 mA (less than 1 watt) ▪ Max current draw during boot process: 340 mA ▪ Constant busy loop: 260 mA ▪ Idle system: 245 mA

▪ Idle system with Ethernet PHY disabled: TBD ▪ Operating Temperature: -40 to 85° C (-40 to 185 ° F), fanless operation ▪ Operating Humidity: 0% to 90% relative humidity, non-condensing

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SoM-A5D36 User Manual

2.2 Real-Time Clock

The SoM-A5D36 has an embedded Real-time Clock. Battery backup is provided from the carrier board using the VSTBY pin. The SoM-A5D36 will retain the RTT value register during reset and hence use it as an RTC. The RTC has the provision to set alarms that can interrupt the processor. For example, the processor can be placed in sleep mode and then later awakened using the alarm function.

2.3 Watchdog Timer

The SoM-A5D36 provides an external Watchdog Timer/ Supervisor (MAX6747) with an extended watchdog timeout period of 1.42 seconds (±10%). Upon power-up the Watchdog is disabled and does not require pulsing. To start the Watchdog, it must first be enabled. This is done by configuring port line PD8 as an output and setting it low in software. Once enabled, the Watchdog should be pulsed, using port line PD6, continually every 1.28 seconds or faster to prevent the Watchdog from timing out and resetting the module. If you are using the watchdog to force a system reset, you may need up to 1.56 seconds of inactivity before the Watchdog reset will occur. The watchdog is automatically disabled upon reset but it can also be disabled by setting PD8 high.

2.4 External Connections

The SoM-A5D36 connects to a carrier board containing its connectors, power supply and any expansion IO, through a standard ENIG-plated (Electroless Nickel Immersion Gold) SODIMM 200-pin connection shown below.

The SoM model will fit in any standard 200-pin SODIMM socket. These connections are designed to be compatible with all EMAC 200-pin SoM products. See EMAC SoM 200-pin SODIMM Pinout Specification to see how other 200-pin SoM pinouts line up with the SoM-A5D36’s pinout.

The use of the DDR SODIMM form-factor for EMAC’s SoMs is a sound choice that has been proven rugged and reliable in the laptop and embedded SBC markets.

The remainder of this section describes the pinout as it applies specifically to the SoM-A5D36 processor.

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SoM-A5D36 User Manual

2.4.1 External Bus

The SoM-A5D36 provides a flexible external bus for connecting peripherals. The CPLD of the SoM-200GS and SoM-250GS connect through a subset of these connections. The WKUP pin has a Maximum input voltage of 3.3V (pulled up on-module to 3.3V) and Shutdown has a maximum output voltage of 3.3V. The Flash WP for the Serial Flash is active-low and pulled up on-module.

Table 1: External Bus Interface

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Description

145

GP_CSA

NCS1

PE27

General Purpose Chip Select CS0

146

GP_CSB

NCS2

PE28

General Purpose Chip Select CS4

147

GP_CSC

NCS3

N/A

General Purpose Chip Select CS2

148

GP_CSD/Shutdown

PWRDN

N/A

Processor Shutdown Output

149

NWE

N/A

Write Signal

150

NRD

N/A

Read Signal

151

RST_IN

NRST * Processor Reset

152

RST_OUT

~RST_OUT * Processor Reset

153

WAIT

NWAIT

PE30

Shutdown Control

154

~FLASH WP

* * Serial Flash Write Protect

WAKEUP

WKUP

N/A

Processor Wakeup Input

157

BOOT_OPTION0

BMS

N/A

Boot0 Option Select

158

BOOT_OPTION1

* * Boot1 Option Select

175-193

A0 – A18

PE0-PE18

Address Bus

194

A19

PE19

Address Bus line A19

195

A20

PE20

Address Bus line A20

196

A21

PE21

Address Bus line A23

159-174

D0 - D15

D0 – D15

N/A

Data Bus

*The RST_IN pin is an active low input that drives the processor reset pin. The RST_OUT pin is an active low output that is driven low by either the watchdog timer or a software reset. The ~FLASH_WP pin is an active low input that prevents the serial NOR flash from being written to. The BOOT_OPTION1 pin is an input that disables the serial NOR flash.

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SoM-A5D36 User Manual

2.4.2 JTAG

The SoM specification allows for access to the JTAG lines for the ATSAMA5D36 processor. These connections will allow the Flash to be programmed in circuit via a program running from the processor and also the capability to debug software.

Table 2: Processor JTAG

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Description

139

JTAG_TCK

JTAG Clock

140

JTAG_TDI

JTAG Serial In

141

JTAG_TDO

JTAG Serial Out

142

JTAG_TMS

JTAG Operation Mode

143

JTAG_TRST

Test Reset Signal

144

JTAG_RTCK

Dynamic Clock Sync

2.4.3 One-Wire / I2C

The SoM-200 specification calls for a two-wire I2C port. The SoM-A5D36 does not have a native hardware One-Wire port but does provide general purpose lines that can be used in this capacity when “bit-banged”. Both Linux and CE provide this functionality.

Table 3: One-Wire / I2C Port

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Description

I2CCLK

TWCK0

PA31

Clock Pin

I2CDATA

TWD0

PA30

Data Pin

There is an additional available I2C interface that is shared with the USB OTG pins. This additional port can be utilized on a custom carrier board.

Table 4: Additional I2C Port

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Description

USB_OTG_VBUS

TWCK1

PC27

Clock Pin

USB_OTG_ID

TWD1

PC26

Data Pin

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SoM-A5D36 User Manual

2.4.4 Ethernet

The SoM-A5D36 provides a Micrel KSZ9031 10/100/1000 Ethernet PHY IC on board. Carrier designers need only run these lines through the appropriate magnetics layer to have a functional Ethernet connection. Remember the RX and TX lines are differential pairs and need to be routed as such.

The LED/configuration pins’ state at reset determines the PHY address. These pins are pulled to set the PHY address to 0x01 by default. The address can be changed by pulling these lines to a different value on a custom carrier board. This can be especially useful if an additional PHY is added to a custom carrier by accessing the RMII pins described below.

Table 5: Ethernet

SODIMM

Pin#

SoM

Pin Name

KSZ9031

Pin Name

Description

GIG D-

TXRXD_N

GIG Ethernet D- pin

GIG D+

TXRXD_P

GIG Ethernet D+ pin

GIG C-

TXRXC_N

GIG Ethernet C- pin

GIG C+

TXRXC_P

GIG Ethernet C+ pin

Ethernet_Rx-/GIG B-

TXRXB_N

Low differential Ethernet receive

Ethernet_Rx+/GIG B+

TXRXB_P

High differential Ethernet receive

Ethernet_Tx-/GIG A-

TXRXA_N

Low differential Ethernet transmit

Ethernet_Tx+/GIG A+

TXRXA_P

High differential Ethernet transmit

LED_LINK/CFG_2

LED2/PHY_AD1

Ethernet Link LED/Configuration

LED_ACT/CFG_3

LED1/PHY_AD0

Ethernet Activity LED/Configuration

Table 6: RMII Ethernet Interface

SODIMM

Pin#

SoM

Pin Name

Processor Pin Name

Description

COMA_DTR

ETX0

RMII Transmit Data 0

100

COMA_DSR

ETX1

RMII Transmit Data 1

101

COMA_RI

ERX0

RMII Receive Data 0

104

COMB_CTS

ERX1

RMII Receive Data 1

105

COMB_RTS

ETXEN

RMII Transmit Control

Card_Detect

ECRSDV

RMII Receive Control

116

GPIO2

ERXER

RMII Receive Error

117

GPIO3

EREFCK

RMII Reference Clock

118

GPIO4

EMDC

RMII Management Data Clock

119

GPIO5

EMDIO

RMII Management Data IO

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SoM-A5D36 User Manual

2.4.5 USB

The SoM 200-pin specification provides for 2 USB hosts and 1 USB device or OTG (On-The-GO) port. The SoM-A5D36 does provide a USB OTG-like port. EMAC has mapped this port to both Host A and Device A ports. This allows the port to be used as a Full time Host port by connection to Host A or for a full time Device port by connection to device Port A. The use of Port A also allows for USB OTG in conjunction with VBUS and ID signals. There is a GPIO line that can be utilized to enable USB power if necessary. This is SoM pin# 125, GPIO11 and is not required if power will always be on. Remember the USB Data lines are differential pairs and need to be routed as such.

Table 7: USB

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Description

Host_A+

HHSD2_P

N/A

Host USB 2.0 PortB +

Host_A-

HHSD2_N

N/A

Host USB 2.0 PortB -

Host_B+

HHSD3_P

N/A

Host USB 2.0 PortC +

Host_B-

HHSD3_N

N/A

Host USB 2.0 PortC -

Host/Device/OTC_C-

H/D_HSD1_N

N/A

OTG USB 2.0 PortA -

Host/Device/OTG_C+

H/D_HSD1_P

N/A

OTG USB 2.0 PortA +

USB_OTG_VBUS

PC27/SPI1_NPCS2/TWCK1

N/A

OTG VBUS

USB_OTG_ID

PC26/SPI1_NPCS1/TWD1

N/A

OTG ID

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SoM-A5D36 User Manual

2.4.6 SPI

The ATSAMA5D36 processor provides two SPI (Serial Peripheral Interface) channels, SPI0 and SPI1, for communicating with peripheral devices. The SPI0 bus is connected internally to the serial flash, which uses SPI0_NPCS0 (SPI0_NPCS0 is not brought out to the card fingers). Table 8 below lists the lines for SPI channel 0. Table 9 below lists the lines for the SPI channel 1. These pins have shared functions and can be accessed through the GPIO header on the SoM-200 carrier board. Note SPI Chip Selects (CS) for both Linux & WinCE do not require a specific SPI_CS and as such can use any GPIO allowing additional chip selects if a custom carrier is used.

Table 8: SPI Channel 0

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Description

SPI_MI

SPI0_MISO

PD10

SPI0 serial data in

SPI_MO

SPI0_MOSI

PD11

SPI0 serial data out

SPI_SCK

SPI0_SPCK

PD12

SPI0 serial clock out

SPI_CS0

SPI0_NCS1/CANRX0

PD14

SPI0 slave select line 0

SPI_CS1

SPI0_NCS2/CANTX0

PD15

SPI0 slave select line 1

SPI_CS2

SPI0_NCS3

PD16

SPI0 slave select line 2

SPI_CS3

SPI0_NCS4/PWMFI2

PC28

SPI0 slave select line 3

Table 9: SPI Channel 1

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Description

126

GPIO12

SPI1_MISO

PC22

SPI1 serial data in

127

GPIO13

SPI1_MOSI

PC23

SPI1 serial data out

128

GPIO14

SPI1_SPCK

PC24

SPI1 serial clock out

134

GPIO15

SPI1_NCS0

PC25

SPI1 slave select line 0

USB_OTG_ID

SPI1_NCS1

PC26

SPI1 slave select line 1

USB_OTG_VBUS

SPI1_NCS2

PC27

SPI1 slave select line 2

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SoM-A5D36 User Manual

2.4.7 MCI Multimedia Card

The SoM-A5D36 provides two 4-bit MMC/SD card interfaces, MCI1 and MCI2. The SoM-200 specification provides for three associated but optional SD/MMC control lines. Since these lines are optional and will not always be used they are not part of the SD/MMC group but are part of the GPIO group. SoM pin#s 122, 123, and 124 can be used as SD_LED, SD_Power, and SD_protect, respectively.

MCI1 is allocated to the SoM Pin Specification in the SD/MMC section as the default SD port. When designing a custom carrier, MCI1 should be used rather than MCI2 if you want to maintain compatibility with present and future SoMs. The SoM-200GS/250GS Carrier boards’ memory sockets make use of MCI1. The MCI2 interface should only be used if you are not concerned about compatibility with existing and future SoMs. MCI2 is accessed through the SoM-A5D36’s GPIO section.

Table 10: MMC/SD Card Interface

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Description

SDCLK

MCI1_CLK

PB24

MCI Clock

CMD

MCI1_CDA

PB19

MCIB Command

DAT0

MCI1_DA0

PB20

MCIB D0

DAT1

MCI1_DA1

PB21

MCIB D1

DAT2

MCI1_DA2

PB22

MCIB D2

DAT3

MCI1_DA3

PB23

MCIB D3

Card_Detect

PC5/TCLK4

PC5

Card Detect

An additional MMC/SD interface is available through shared GPIO lines. All the lines for the second MMC/SD port are brought out to a header on the SoM-200 carrier.

Table 11: Additional MMC/SD Card Interface

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Description

125

GPIO11

MCI2_CK/PCK2

PC15

MCI Clock

120

GPIO6

MCI2_CDA

PC10

MCIC Command

121

GPIO7

MCI2_DA0

PC11

MCIC D0

122

GPIO8

MCI2_DA1/TIOA1

PC12

MCIC D1

123

GPIO9

MCI2_DA2/TIOB1

PC13

MCIC D2

124

GPIO10

MCI2_DA3/TCLK1

PC14

MCIC D3

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SoM-A5D36 User Manual

2.4.8 Serial Ports

The SoM-200 pin specification has the provision for 4 serial ports. However, the ATSAMA5D36 provides 6 serial ports. The additional serial ports are accommodated through the use of alternate SoM pins. COMB (Debug port) is normally the console port. The ATSAMA5D36 processor does not provide full modem handshaking for COMA as called for in the SoM-200 pin specification, therefore EMAC has utilized processor GPIO lines for this function. The RTS lines for each port can be used to achieve automatic RS485 direction control.

Table 12: Serial Ports

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

SoM Description

COMA_TXD

TXD1

PB29

COMA transmit/GPIO

COMA_RXD

RXD1

PB28

COMA receive/GPIO

COMA_CTS

CTS1

PB26

COMA CTS/GPIO

COMA_RTS

RTS1

PB27

COMA RTS/GPIO

COMA_DTR

PC0/TIOA3

PC0

COMA DTR/GPIO

100

COMA_DSR

PC1/TIOB3

PC1

COMA DSR /GPIO

101

COMA_RI

PC2/TCLK3

PC2

COMA RING/GPIO

102

COMB_TXD

DTXD

PB31

COMB transmit/GPIO

103

COMB_RXD

DRSD

PB30

COMB receive/GPIO

104

COMB_CTS

PC3/TIOA4

PC3

COMB CTS/GPIO

105

COMB_RTS

PC4/TIOB4

PC4

COMB RTS/GPIO

106

COMC_TXD

TXD2

PE26

COMC transmit/GPIO

107

COMC_RXD

RXD2

PE25

COMC receive/GPIO

108

COMC_CTS

CTS2

PE23

COMC CTS/GPIO

109

COMC_RTS

RTS2

PE24

COMC RTS/GPIO

110

COMD_TXD

TXD0

PD18

COMD transmit/GPIO

111

COMD_RXD

RXD0

PD17

COMD receive/GPIO

112

COMD_CTS

CTS0/URXD0

PC29

COMD CTS/GPIO

113

COMD_RTS

RTS0/UTXD0

PC30

COMD RTS/GPIO

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SoM-A5D36 User Manual

The additional 2 serial ports are available through the alternative multiplexed SoM pins.

Table 13: Additional Serial Ports

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Pin Description

I2C_CLK

UTXD1

PA31

UART 1 Transmit Data

I2C_DAT

URXD1

PA30

UART 1 Receive Data

113

COMD_RTS

UTXD0

PC30

UART 0 Transmit Data

112

COMD_CTS

URXD0

PC29

UART 0 Receive Data

2.4.9 I2S

The ATSAMA5D36 provides an I2S audio port which is accommodated within the SoM specification. Note that there is no CODEC on the SoM and therefore must be provided on the Carrier. In addition, the CODEC will require either SPI or I2C for control.

Table 14: I2S

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Description

AudioA_SCLK

TK0

PC16

I2S Serial Clock

AudioA_LRCLK/Frame

TF0

PC17

I2S Left / Right Clock

AudioA_MCLK

I2S Master Clock

AudioA_DIN

RD0

PC21

I2S Data Input

AudioA_DOUT

TD0

PC18

I2S Data Output

*The Master clock is driven On-Module by a 12.288 MHz oscillator to produce the 12.288 MHz Master clock. This oscillator is off by default and must be turned on via setting GPIO port line PC19 High. To reduce power the oscillator should be turned off when not required.

2.4.10 CAN

The SoM-200 specification provides for one CAN port. The SoM-A5D36 has two CAN ports. One is available through the SoM pin specification and the other is available through shared pins.

Table 15: CAN

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Pin Description

CANTX

CANTX1

PB15

CAN Transmit

CANRX

CANRX1

PB14

CAN Receive

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SoM-A5D36 User Manual

The second CAN port is available through the SPI chip select lines. With a custom carrier the use of the second CAN port can be utilized.

Table 16: CAN 2

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Pin Description

SPI_CS1

CANTX0

PD15

CAN Transmit

SPI_CS0

CANRX0

PD14

CAN Receive

2.4.11 GPIO

This section provides for the SoM general purpose IO section. All of these pins can be configured to be general-purpose digital ports. They can also be configured to take advantage of several of the functions of the SoM-A5D36’s internal silicon. All of the internal A/D ports are brought out here, as well as all of the available IRQs, the second SPI and the pins for general-purpose timer/counters.

Table 17: General Purpose IO

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Description

114

GPIO0

PD5

Port D5

115

GPIO1

PD7

Port D7

116

GPIO2

PC6

Port C6

117

GPIO3

PC7

Port C7

118

GPIO4

PC8

Port C8

119

GPIO5

PC9

Port C9

120

GPIO6

PC10

Port C10

121

GPIO7

PC11

Port C11

122

GPIO8

PC12

Port C12

123

GPIO9

PC13

Port C13

124

GPIO10

PC14

Port C14

125

GPIO11

PC15

Port C15

126

GPIO12

PC22

Port C22

127

GPIO13

PC23

Port C23

128

GPIO14

PC24

Port C24

134

GPIO15

PC25

Port C25

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SoM-A5D36 User Manual

2.4.12 Interrupts

The SoM specification defines 3 interrupt lines however, any GPIO on the ATSAMA5D36 processor may be programmed for interrupts.

Table 18: Interrupt Lines

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Description

129

IRQA

FIQ/PC31

Fast Interrupt Request

130

IRQB

IRQ/PE31

General Interrupt Request

131

IRQC

PE29

General Interrupt Request

2.4.13 ADC

The SoM-200 Pin Specification allocates SoM pins that can be utilized as Touchscreen or ADC inputs. Also, if a touchscreen is not used, the lines that would normally be used in this capacity can also be used as ADC inputs. The ATSAMA5D36 features a 12-channel, 12-bit ADC that can be used in single or dual ended configuration. Ten of these channels are available through the edge connector. The first four lines are used for a typical resistive 4-wire touchscreen. The ATSAMA5D36 does support 5 wire touchscreens. In addition to the 8 ADC pins allocated by the SoM specification there are an additional 2 ADC channels available through alternative pin functions. The analog reference is enabled by default, but it can be turned off if you are not using the touchscreen or ADC inputs by changing PB25 to an output and driving it low. The SoM-A5D36 provides a filtered onboard 3.3 Volt reference for the ADC.

Table 19: Analog to Digital Converters

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Description

X+/Xr/ADC0

AD0

PD20

X+ or ADC0

X-/Xl/ADC1

AD1

PD21

X- or ADC1

Y+/Yu/ADC2

AD2

PD22

Y+ or ADC2

Y-/Yd/ADC3

AD3

PD23

Y- or ADC3

SX+/ADC4

AD4

PD24

SX+ or ADC4

SX-/ADC5

AD5

PD25

SX- or ADC5

SY+/ADC6

AD6

PD26

SY+ or ADC6

SY-/ADC7

AD7

PD27

SY- or ADC7

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SoM-A5D36 User Manual

Table 20: Additional ADC Channels

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Description

132

OSC0

AD10/PD30

ADC Channel 10

133

OSC1

AD11/PD31

ADC Channel 11

2.4.14 Timer/Counters

The general-purpose Timer/Counter (TC) module on the ATSAMA5D36 is comprised of six 32-bit timer/counter channels with independently programmable input capture or output compare lines. These can be used for a wide variety of timed applications, including counters and PWM. There are 5 separate Timer/Counters available on the card edge. Some of them are pinned out to the GPIO section of the SoM and the rest are available as alternate pin functions.

Table 21: Timers/Counters

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Description

COMA_DTR

TIOA3/PC0

Timer 3 IO A

100

COMA_DSR

TIOB3/PC1

Timer 3 IO B

101

COMA_RI

TCLK3/PC2

Timer 3 Clock

104

COMB_CTS

TIOA4/PC3

Timer 4 IO A

105

COMB_RTS

TIOB4/PC4

Timer 4 IO B

Card_Detect

TCLK4/PC5

Timer 4 Clock

114

GPIO0

TIOA0/PD5

Timer 0 IO A

115

GPIO1

TCLK0/PD7

Timer 0 Clock

116

GPIO2

TIOA5/PC6

Timer 5 IO A

117

GPIO3

TIOB5/PC7

Timer 5 IO B

118

GPIO4

TCLK5/PC8

Timer 5 Clock

122

GPIO8

TIOA1/PC12

Timer 1 IO A

123

GPIO9

TIOB1/PC13

Timer 1 IO B

124

GPIO10

TCLK1/PC14

Timer 1 Clock

2.4.15 SoM Status LED

One general purpose IO is connected to a green status LED on the SoM. The LED may be turned on by writing port line PE22 high.

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SoM-A5D36 User Manual

2.4.16 LCD

The SoM-200 specification has provision for up to 24-bit LCDs (8-bits per RGB color). These lines can also be used to provide analog VGA connectivity for use with a conventional monitor by adding a video DAC to the Carrier. A Brightness PWM is also provided to allow for software control of the LCD’s Brightness.

Table 22: LCD

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Port Line

Description

LCD_BLUE0

LCDDAT0

PA0

LCD BLUE0

LCD_BLUE1

LCDDAT1

PA1

LCD BLUE1

LCD_BLUE2

LCDDAT2

PA2

LCD BLUE2

LCD_BLUE3

LCDDAT3

PA3

LCD BLUE3

LCD_BLUE4

LCDDAT4

PA4

LCD BLUE4

LCD_BLUE5

LCDDAT5

PA5

LCD BLUE5

LCD_BLUE6

LCDDAT6

PA6

LCD BLUE6

LCD_BLUE7

LCDDAT7

PA7

LCD BLUE7

LCD_GREEN0

LCDDAT8

PA8

LCD GREEN0

LCD_GREEN1

LCDDAT9

PA9

LCD GREEN1

LCD_GREEN2

LCDDAT10

PA10

LCD GREEN2

LCD_GREEN3

LCDDAT11

PA11

LCD GREEN3

LCD_GREEN4

LCDDAT12

PA12

LCD GREEN4

LCD_GREEN5

LCDDAT13

PA13

LCD GREEN5

LCD_GREEN6

LCDDAT14

PA14

LCD GREEN6

LCD_GREEN7

LCDDAT15

PA15

LCD GREEN7

LCD_RED0

LCDDAT16

PA16

LCD RED0

LCD_RED1

LCDDAT17

PA17

LCD RED1

LCD_RED2

LCDDAT18

PA18

LCD RED2

LCD_RED3

LCDDAT19

PA19

LCD RED3

LCD_RED4

LCDDAT20

PA20

LCD RED4

LCD_RED5

LCDDAT21

PA21

LCD RED5

LCD_RED6

LCDDAT22

PA22

LCD RED6

LCD_RED7

LCDDAT23

PA23

LCD RED7

LCD_HORZ/LP

LCDHSYNC

PA27

Horizontal Sync

LCD_VERT/FP/FLM

LCDVSYNC

PA26

Vertical Sync

LCD_ENABLE/DE/M

LCDDEN

PA29

Enable

LCD_CLK/SFK/SHFCLK

LCDPCK

PA28

LCD Clock

BCKLIGHT

LCDPWM

PA24

Backlight Brightness Control

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SoM-A5D36 User Manual

2.4.17 Additional Interfaces

The SoM-A5D36 has additional optional interfaces available by trading some of the features outlined in the SoM specification.

Image Sensor Interface (ISI):

The ATSAMA5D36 Processor has a 12-bit Image Sensor Interface available for use if the LCD is not used. The table below shows the SoM pin connections for a custom carrier that uses the ISI.

The Image Sensor Interface connects a CMOS-type image sensor to the processor and provides image capture in various formats. It does data conversion, if necessary, before storing in memory through DMA. The interface can accommodate both 8 and 12-bit sensors.

Table 23: Image Sensor Interface

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Description

LCD_RED0

ISI_D0/LCDDAT16

ISI Data 0

LCD_RED1

ISI_D1/LCDDAT17

ISI Data 1

LCD_RED2

ISI_D2/LCDDAT18

ISI Data 2

LCD_RED3

ISI_D3/LCDDAT19

ISI Data 3

LCD_RED4

ISI_D4/LCDDAT20

ISI Data 4

LCD_RED5

ISI_D5/LCDDAT21

ISI Data 5

LCD_RED6

ISI_D6/LCDDAT22

ISI Data 6

LCD_RED7

ISI_D7/LCDDAT23

ISI Data 7

112

COMD_CTS

ISI_D8/PC29

ISI Data 8

SPI_CS3

ISI_D9/PC28

ISI Data 9

USB_OTG_VBUS

ISI_D10/PC27

ISI Data 10

USB_OTG_ID

ISI_D11/PC26

ISI Data 11

113

COMD_RTS

ISI_PCK/PC30

ISI Pixel Clock

I2C_DATA

ISI_VSYNC/PA30

ISI Vertical Sync

I2C_CLK

ISI_HSYNC/PA31

ISI Horizontal Sync

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SoM-A5D36 User Manual

2.5 Power Connections

The SoM-A5D36 requires a 3.3V supply for the Bus and I/O voltages. The 1.2V core voltage is regulated on module from the 3.3V. Unlike some other modules no other supply voltage other than 3.3V is required.

Table 24: Power Connections

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Description

3,4,43,44,135,

136,197,198

3.3VCC

3.3 Volt SoM Supply Voltage

1,2,20,21,41,42,

91,92,137,138,

155,156,199,200

GND

Digital Ground

Analog_GND

ADC_GND

Analog Ground

VSTBY

Vstandby_3.3

Voltage standby, this is the backup voltage

provided to the SoM’s RTC. If RTC readings are not

important for the application, this can be attached to the 3.3V rail.

AV_REF

Analog power/reference. This voltage provides power to the internal analog circuitry of the processor. It can be typically connected to 3.3V. LC filtering for this power signal is provided onmodule.

2.6 Boot Options

The SoM specification provides two pins for boot-time configuration. On the SoM-A5D36, these are BMS and Flash Disable. The Boot Mode Select (BMS) pin allows the SoM-A5D36 to be low-level booted from either its internal ROM (3.3V) or external (carrier resident) NOR flash (GND). The Flash Disable pin should be tied to GND to enable the Serial Flash or 3.3V to disable.

For normal system Boot, the SoM-A5D36 should be configured as follows:

BOOT_OPTION0 – 3.3V

BOOT_OPTION1 – GND

The Module can high-level boot from either the Serial Flash or the eMMC Flash (selected through the lowlevel bootloader). It is recommended to high-level boot from the Serial Flash, as this Flash is more reliable

than the eMMC Flash. The eMMC flash is ideal for the Operating System’s File System which can normally

mark bad blocks.

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SoM-A5D36 User Manual

Table 25: Boot Options

SODIMM

Pin#

SoM

Pin Name

Processor

Pin Name(s)

Description

157

BOOT_OPTION0

BMS

Serial Boot Mode Select

158

BOOT_OPTION1

Disable Serial Flash

2.7 Serial Data Flash

The Serial Flash is connected to SPI0 and uses SPI0_NPCS0 to enable it. The Serial Flash also has a WriteProtect Provision. To Write-Protect the Serial Flash, pull SoM pin# 154 low. SoM pin# 154 is pulled up by a 10K ohm resistor on the module.

If this feature is required it would be implemented on the carrier as a jumper or an I/O line.

3 Design Considerations

One of the goals of the SoM-A5D36 is to provide a modular, flexible and inexpensive solution capable of delivering high-end microcontroller performance with low power requirements.

3.1 Off-the-Shelf Carriers

Many SoM-A5D36 applications can make use of EMAC’s off-the-shelf carriers. These carriers provide power to the SoM as well as a wealth of connectors and interfaces to access peripheral I/O including audio and LCD.

3.1.1 SoM-200GS

This is a Half-EBX mounting hole form factor (4.37" x 6.00") carrier that comes with a 4.3” LCD interface as well as full schematics and a BOM, and can be used as is, or as a reference for a customer’s own design.

• 10/100/1000 BaseT Ethernet with Status LEDs

• 3 serial RS232 ports and 1 RS232/422/485 port

• Resistive Touchscreen interface

• 480 x 272 Graphic LCD with Touchscreen

• Battery for nonvolatile RAM and Real Time Clock

• Micro SD Card Socket

• 2 USB Host & 1 USB OTG ports

• 1 I2S Audio port with Line-In/Line-Out

• 5 VDC Power Requirement

http://emacinc.com/products/system_on_module/SoM-200GS

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SoM-A5D36 User Manual

3.1.2 SoM-250GS

This is a 6.55" x 4.15" carrier designed as a basis for a 7” or 10” Panel PC.

• 10/100/1000 BaseT Ethernet with onboard Magnetics and RJ45

• 3 serial RS232 ports and 1 RS232/422/485 port

• Resistive Touchscreen interface

• 800 x 480 (WVGA) or 1024 x 600 (WSVGA) Graphic LCD with Touchscreen

• Battery for nonvolatile RAM and Real Time Clock

• Micro SDHC/MMC Flash Card Socket

• 2 USB Host & 1 USB OTG ports

• 1 I2S Audio port with Line-In/Line-Out

• 1 Audio Beeper

• Timer/Counters and Pulse Width Modulation (PWM) ports

• Operating Voltage of 12 to 28 Vdc.

• Graphic LCD Interface

http://emacinc.com/products/system_on_module/SoM-250GS

3.2 Semi-Custom Carriers

EMAC also offers a semi-custom engineering service. By modifying one of our existing designs, EMAC can offer quick-turn, low-cost engineering, for your specific application.

3.3 Designing Your Own Carrier

It is best to start with the SoM-200GS as a reference. When designing a carrier be sure to use a 200 pin DDR1 SODIMM socket instead of the more common DDR2 socket. The DDR2 socket is keyed in such a way as to prevent the SoM from being inserted into it. The part number for a compatible DDR1 socket made by Tyco is 1473005-1. This socket will provide 3.0 mm of height from the top of carrier PCB to the bottom of the module PCB. The module specification allows for a 1.5 mm maximum height for bottom components. Therefore, this allows the user < 1.5 mm for placing components safely under the module. If more height is needed, Tyco as well as other manufacturers make SODIMM sockets with additional height, although these are more expensive.

If using the SoM-A5D36’s external bus, it is highly recommended to buffer the bus on the carrier board in close proximity to the SoM SODIMM connector (see the SoM-200 carrier schematics for reference).

3.3.1 Power

The SoM-A5D36 requires a voltage of 3.3V at 300mA for a normal operation, users can get away with using only 3.3V, and simply provide this to all the voltage inputs listed in 3.6. This however, will not provide battery backup for the RTC. Additionally, 5V is required if USB Host capability is required.

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SoM-A5D36 User Manual

3.3.2 Analog Reference

The reference for the analog to digital converter is provided on the SoM with no need to provide and external reference. The onboard ADC reference is 3.3 Volts and can be switched on and off. The touch screen uses the ADC pins on the processor so the ADC reference must be enabled for the touch screen controller to function properly.

3.3.3 Battery Backup

The SoM-A5D36 contains 3 potentially non-volatile memory areas, the eMMC flash, the real-time clock, and the serial flash of the processor. The flash is always non-volatile, the real-time clock requires a backup voltage to maintain its data. This backup voltage comes from the VSTBY SoM pin, and should be connected to 3.3 volts.

The RTC will draw approximately 8 µA when the processor is not powered by the 3.3V supply. Be aware that the Static current can rise if the temperature increases to 85° C. When the module is powered no current is drawn from the backup battery supply. If RTC backup is not needed, this can be tied to 3.3V.

The SoM-200GS, as well as other carriers, provide battery backup voltage through a replaceable BR2032, which is a standard 3V 190mA/H 20MM coin battery that can be picked up from most electronics stores.

3.3.4 Shutdown Logic Pins

The SHDN is a digital output only (0 to 3.3V, pulled up on-module), which is driven by the Shutdown Controller on the processor.

The WKUP pin has a Maximum input voltage of 3.3V, but cannot exceed VDDBU.

Both of these pins are connected directly to the processor.

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SoM-A5D36 User Manual

4 Software

The SoM-A5D36 offers a wide variety of software support from both open source and proprietary sources. The hardware core utilizes the Atmel ARM Cortex-A5 ATSAMA5D36, which is supported by Linux.

For more information on Linux Software Support, please visit the EMAC Wiki Software Section at:

http://wiki.emacinc.com/wiki/Product_wiki

4.1 Das U-Boot

EMAC utilizes Das U-Boot for its ARM based products. U-Boot is an open source/cross-architecture platform independent bootloader. It supports reading and writing to the flash, auto-booting, environmental variables, and TFTP. Das U-boot can be used to upload and run and/or reflash the OS or to run stand-alone programs without an OS. Products are shipped with a valid MAC address installed in flash in the protected U-boot environmental variable “ethaddr”. At boot time U-Boot automatically stores this address in a register within the MAC, which effectively provides it to any OS loaded after that point.

4.2 Embedded Linux

EMAC Open Embedded Linux (EMAC OE Linux) is an open source Linux distribution for use in embedded systems. The EMAC OE Linux Build is based on the Open Embedded (www.openembedded.org) and Yocto (www.yoctoproject.org) Linux build systems. Open Embedded is a superior Linux distribution for embedded systems. Custom Linux builds are also available on request.

The distribution contains everything a user could expect from a standard Linux kernel: powerful networking features, advanced file system support, security, debugging utilities, and countless other features.

The basic root file system includes:

▪ Busybox ▪ Hotplugging support ▪ APM utilities for power management ▪ Openssh SSH server ▪ lighttpd HTTP server ▪ JJFS2 or EXT4 file system with utilities

4.2.1 Linux with Xenomai Real Time Extensions

Xenomai provides real time extensions to the kernel and can be used to schedule tasks with hard deadlines and s latencies. The Xenomai build is an additional module that can be added to the standard Linux kernel and is available for a one-time inexpensive support/installation fee.

http://www.xenomai.org/

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SoM-A5D36 User Manual

4.2.2 Linux Packages

EMAC provides support for many Linux Packages such as: PHP, SQLite, Perl, SNMP, DHCP Server, etc. As with the Xenomai Package, other Packages can be added to the standard Linux file system and are available for a one-time inexpensive support/installation fee.

4.2.3 Linux Patches

In addition to standard Embedded Linux support, EMAC has released a number of patches and device drivers from the open source community and from internal EMAC engineering into its standard distribution. Along with kernel patches, EMAC provides the binaries for the kernel and root file system.

4.3 Qt Creator

Qt Creator is a cross-platform IDE (Integrated Development Environment) tailored to the needs of Qt developers but works well for Headless applications as well. EMAC provides sample code as projects that can be imported into Qt Creator. Qt Creator supports remote deployment and source debugging.

http://wiki.qt.io/Main

4.4 ARM EABI Cross Compiler

The popular open source gcc compiler has a stable build for the ARM family. EMAC uses the 4.9.1 version of the ARM EABI compiler. The Embedded Linux kernel and EMAC Qt Creator projects use this compiler for building ARM stand alone, and OS specific binaries. The EMAC Qt Creator provides source level debugging over Ethernet or serial using gdbserver. The Linux binaries for the ARM EABI cross compiler are available online along with the SDK. See the EMAC wiki for further information.