Getting started with IGEP COM AQUILA

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IGEP COM AQUILA Tutorial Guides
1/3 - Getting started with IGEP COM AQUILA
2/3 - What can I do with IGEP COM AQUILA
3/3 - Start developing with IGEP COM AQUILA
IGEP COM AQUILA Product Page
IGEP COM AQUILA Hardware manual
This is a work in progress article. Help other developers like you in the IGEP Community by improving it!

Overview

This is the 1/3 chapter of the Getting Started with IGEP COM AQUILA Tutorial Guide.

The first chapter helps to develop a baseboard that lets us expand the IGEP COM AQUILA functionalities.

Upon completion, you will be ready to continue with chapter 2/3 that explains how to use templates, tools and other methods to help us create a custom Linux-based system for your project.

This chapter is based in some references detailed below. Read this references or ask to forum if this guide doesn't resolve your dudes.


Resources

Main Resources

For this tutorial, we are going to use some resources available into IGEP COM AQUILA MainPage and IGEP AQUILA EXPANSION MainPage.

Other resources

Other interesting resources available can be obtained at:

Brew introduction to IGEP COM AQUILA

The IGEP COM AQUILA (IGEP0033) is an industrial processor module with 256 MB RAM plus 128 MB FLASH, it is based in ARM Cortex-A8 AM335x CPU up to 1GHz with SODIMM200 form factor size.


Block diagram from IGEP0033
Diagram from IGEP0033

TOP side
BOT side
Mechanical from IGEP0033

Getting started

One of the most interesting parts about IGEP COM AQUILA Board is the versatility that offers to baseboard designers to implement their own specific solution. But this versatility represents too an obstacle to start developing the baseboard.

To resolve this initial obstacle, this guide does an abstract about every single part, each part is classified by:

  • Power, system boot and resets
  • Peripherals

Power, system boot and resets

This part can be helpful to power up and power down the full system correctly.

Power sources

Input Power sources

  • VIN is the main source voltage that generates all the necessary internal voltages to IGEP COM AQUILA. VIN source needs 5V, read the design rules to determine the maximum current load applied.
  • VBACKUP is RTC backup power supply used to keep alive the hardware clock.

Output Power sources

  • VOUT is a linear regulator output source that offers 3V3 and 1A.
  • VREFP_ADC is a supply voltage used for AM335x analog digital converters.

Power sources design rules

  • IGEP COM AQUILA uses a TPS73701, this LDO converts 5V (VIN input) to 3V3 (VOUT output), so you can use the following formula to calculate the maximum VIN current consumption: Ivin (maximum supply current) = 550 mA (internal maximum supply current) + Ivout (Vout maximum output current used).
  • More information at IGEP AQUILA EXPANSION Hardware Reference Manual section 6.1

System boot

BOOTMODE pin

  • BOOTMODE is used to setup a boot priority sequence. BOOTMODE is equal to #SYS_BOOT4 and it has a 100K PU resistor.

BOOTMODE design rules

Resets

PMIC Resets

  • PMIC_PWR_BTN: Drive to low to turn off power supply (long press). Also, this pin can generate interrupts to AM335x (short press).

AM335x Resets

  • #RESET_OUT this pin is used to reset IC from IGEP COM AQUILA like LAN8720, it is managed by AM335x.
  • #POR (Power on Reset) is a cold Reset used during AM335x power-up and power-down sequences, this pin is managed by PMIC into IGEP COM AQUILA.
  • #RESET_IN is a warm Reset (also named fast reset).

Resets design rules

AM335x peripherals

This part can be helpful to expand correctly the AM335x peripherals. AM335x peripherals are expanded through SODIMM200 connector and they are classified by:

  • Dedicated lines: These lines were designed to work with a specific functionality. Change its functionality its not possible or recommended.
  • Optional lines: These lines were designed to work with different functionalities. AM335x Mux peripheral is used to select one functionality. Mux options are vast, at the beginning can be difficult and tedious change some configurations. Before configure mux, use the following tips to avoid problems:
    • Mux can connect multiple pads at the same peripheral, this improper use can damage the processor. Before configure mux, revise that this peripheral is not used in other pads in your design. Read each peripheral chapter to implement your initial design and use the resources available above to revise your implementation.
    • Some peripherals are only available if you place or replace some resistances into IGEP COM AQUILA. See IGEP COM AQUILA Hardware Reference Manual section 6.1 to get more information.
    • Some pads share internal components. See IGEP COM AQUILA Hardware Reference Manual section 6.1 to get more information.
    • Some SODIMM pads share an AM335x pad. See IGEP COM AQUILA Hardware Reference Manual section 6.1 to get more information.


Finally, the second part of this manual we are going to modify software to change Mux configuration properly.

Ethernet

Dedicated Ethernet

IGEP COM AQUILA uses LAN8720 transceiver to add Ethernet communication. IGEP AQUILA EXPANSION Public Schematics adapts SODIMM lines for a RJ-45 connector.

Name SODIMM pad AM335x pad
ETN_TXN 19 -
#ETN_LED2 20 -
ETN_TXP 21 -
ETN_3V3 22 -
ETN_RXN 23 -
#ETN_LED1 24 -
ETN_RXP 25 -

Ethernet design rules

  • For Ethernet data lines: TX differential lines (ETN_TXN and ETN_TXP) and RX differential lines (ETN_RXN and ETN_RXP)
    • Equal length and symmetric with regards of shape, length, and via count.
    • Maintain 100R differential impedance in the layout traces.
    • Isolate differential pairs from nearby signals and circuitry to maintain the signal integrity.
  • Among PHY vendors, the 25mm rule is considered good design practice for EMI considerations. The intention is to isolate the PHY from the magnetics.
  • Common mode capacitors in data lines are not necessary because IGEP COM AQUILA includes them.
  • If the magnetic is a discrete component:
    • The distance between the magnetic and the RJ-45 needs to have the highest consideration and be kept to under 25mm of separation.
    • The distance between the SODIMM and the magnetics needs to be 20mm or greater.

USBs

Dedicated USB Host

IGEP COM AQUILA uses USB1 peripheral as USB 2.0 Host. IGEP AQUILA EXPANSION Public Schematics adapts SODIMM lines for an USB Type A receptacle.

Name SODIMM pad AM335x pad
USBH_VBUSEN 27 F15
#USBH_OC 28 R13
USBH_DM 29 R18
USBH_VBUS 30 T18
USBH_DP 31 R17

Dedicated USB OTG

IGEP COM AQUILA uses USB0 peripheral as USB 2.0 OTG. IGEP AQUILA EXPANSION Public Schematics adapts SODIMM lines for an USB Type mini AB receptacle.

Name SODIMM pad AM335x pad
USBOTG_ID 33 P16
USBOTG_VBUSEN 34 F16
USBOTG_DM 35 N18
#USBOTG_OC 36 V17
USBOTG_DP 37 N17
USBOTG_VBUS 38 P15

USB design rules

  • For USB data lines: USB1 (USBH_DM and USBH_DP) and USB0 (USBOTG_DM and USBOTG_DP)
    • Maintain 90R +/- 15% differential impedance in the layout traces.
    • Equal length and symmetric with regards of shape, length, and via count.
    • Isolate differential pairs from nearby signals and circuitry to maintain the signal integrity.
  • VBUS overcurrent protection: USB power source current must not be pass 500mA, you should apply a protection into the baseboard. IGEP AQUILA EXPANSION Public Schematics proposes a solution using TPS2051D IC.
  • IGEP COM AQUILA includes into each USB peripheral a VBUS overvoltage protector.

I2C

Dedicated I2C

IGEP COM AQUILA uses I2C0 as a dedicated bus. I2C0 is shared with PMIC (0x2d address) and has 5K PU.

Name SODIMM pad AM335x pad
I2C0_SCL 41 C16
I2C0_SDA 40 C17

Optional I2C

IGEP COM AQUILA contains two optional I2C buses:

Name SODIMM pad AM335x pad
I2C1_SCL 44 A16
I2C1_SDA 47 B16
I2C2_SCL 46 B17
I2C2_SDA 48 A17

I2C design rules

  • I2C0 should be your default option, but it could be interesting use Optional I2Cs if your external peripheral needs to use a huge transfer data connection.
  • Optional I2Cs needs to be pulled up externally, 5K resistor tied to 3V3 must be necessary.
  • IGEP COM AQUILA uses 3V3 voltage levels for I2C buses. In some cases, voltage translators like TXS0102 should be necessary to adapt voltage levels between ICs.

SPI

Optional SPI

IGEP COM AQUILA contains two optional SPI bus:

Name SODIMM pad AM335x pad
SPI0_CS0 44 A16
SPI0_CS1 45 C15
SPI0_D0 46 B17
SPI0_D1 47 B16
SPI0_CLK 48 A17
SPI1_CS0 60 E15
SPI1_CS1 59 E16
SPI1_D0 61 E18
SPI1_D1 62 E17
SPI1_CLK 68 H16

SPI design rules

  • Optional SPI1 is not recommended to use, because some lines are shared with UART0 (Kernel Debug UART).
  • IGEP COM AQUILA uses 3V3 voltage levels for SPI buses. In some cases, voltage translators like TXS0102 should be necessary to adapt voltage levels between ICs.

MMC

Dedicated MMC

IGEP COM AQUILA uses MMC0 from on board uSD card reader, but this pins are available into SODIMM connector too:

Name SODIMM pad AM335x pad
MMC0_CD 95 A13
MMC0_DAT0 96 G16
MMC0_DAT1 97 G15
MMC0_DAT2 98 F18
MMC0_DAT3 99 F17
MMC0_CMD 100 G18
MMC0_CLK 101 G17

Optional MMC

IGEP COM AQUILA contains an optional MMC bus called MMC1:

Name SODIMM pad AM335x pad
MMC1_CD 51 B13
MMC1_DAT0 52 K18
MMC1_DAT1 53 L18
MMC1_DAT2 54 L17
MMC1_DAT3 55 L16
MMC1_CMD 56 V9
MMC1_CLK 57 U9

MMC design rules

  • MMC0 can not be used by SODIMM connector and on board uSD card reader at the same time.
  • MMC1 is not bootable during system boot process using the bootmode pad.
  • MMC1 bus is a good option to expand memory capacities or use as a backup memory.
  • MMC bus needs PU resistors to avoid unknown signals. 10K PU resistors tied to 3V3 must be necessary in lines:SD1_Dx, SD1_CD and SD1_CLK.
  • Optional: low resistance resistors could be necessary to equalize bus impedances. Use 10R series resistors in lines: SD1_Dx, SD1_CD and SD1_CLK .

UART

Optional UARTs

IGEP COM AQUILA contains six optional UARTs buses:

Name SODIMM pad AM335x pad
UART0_TX 59 E16
UART0_RX 60 E15
UART0_CTS 61 E18
UART0_RTS 62 E17
UART1_TX 63 D15
UART1_RX 64 D16
UART1_CTS 65 D18
UART1_RTS 66 D17
UART2_TX 52 K18
UART2_RX 53 L18
UART3_TX 45 C15
UART3_TX 54 L17
UART3_RX 55 L16
UART3_RX 74 C18
UART4_TX 76 J18
UART4_RX 81 K15
UART5_TX 67 J17
UART5_RX 68 H16
UART5_CTS 97 G15
UART5_RTS 96 G16

UART design rules

  • IGEP COM AQUILA uses UART0 as a Kernel Debug Peripheral. This UART is an inexpensive method to detect and repair system issues. It is recommendable use another UART instead of UART0 to preserve this functionality.
  • UART5_RTS and UART5_CTS are shared with MMC0 (uSD card reader), don't use both peripherals at the same time. Find more information at IGEP COM AQUILA Hardware Reference Manual section 6.1
  • IGEP COM AQUILA uses 3V3 voltage levels for UART buses. In some cases, voltage translators like TXS0102 should be necessary to adapt voltage levels between ICs.

Video

Optional Video

IGEP COM AQUILA contains a LCD controller. This peripheral uses a Display Pixel Interface to transmit the information.

Name SODIMM pad AM335x pad
LCD_D0 117 U10
LCD_D1 118 U12
LCD_D2 119 V13
LCD_D3 120 U4
LCD_D4 121 V2
LCD_D5 122 V3
LCD_D6 123 V4
LCD_D7 124 T5
LCD_D8 125 T10
LCD_D9 126 T12
LCD_D10 127 T2
LCD_D11 128 T3
LCD_D12 130 T4
LCD_D13 131 U1
LCD_D14 132 U2
LCD_D15 133 U3
LCD_D16 134 T11
LCD_D17 135 R12
LCD_D18 136 U13
LCD_D19 137 R1
LCD_D20 138 R2
LCD_D21 139 R3
LCD_D22 140 R4
LCD_D23 141 T1
LCD_HSYNC 143 R5
LCD_VSYNC 144 U5
LCD_OE_ACD 145 R6
LCD_SCLK 146 V5

Video design rules

  • IGEP AQUILA EXPANSION Public Schematics adapts SODIMM video lines to HDMI Transmitter.
  • Optionally: common mode capacitors could be added between video data lines and GND for high frequency attenuation. Typical capacitance values should be between 22pF and 47pF.
  • Optionally: low resistance resistors could be necessary to equalize bus impedances. 10R series resistors to data and clock lines could be necessary.

Audio

Optional Audio

IGEP COM AQUILA has a MCASP transceiver, it is a digital multichannel audio serial port used by microprocessors, DSPs and popular industry audio CODECs that implement the inter-IC sound bus standard (I2S) and Intel AC97 standard. IGEP AQUILA EXPANSION Public Schematics uses this bus to send audio data to HDMI transceiver.

Name SODIMM pad AM335x pad
MCASP0_ACLKR 86 B12
MCASP0_ACLKR 67 J17
MCASP0_ACLKR 75 U18
MCASP0_ACLKR 146 V2
MCASP0_ACLKX 42 and 95 A13
MCASP0_ACLKX 52 K18
MCASP0_ACLKX 131 U1
MCASP0_ACLKX 158 V16
MCASP0_AHCLKR 73 C12
MCASP0_AHCLKX 85 A14
MCASP0_AHCLKX 81 K15
MCASP0_AXR0 83 D12
MCASP0_AXR0 54 L17
MCASP0_AXR0 153 T16
MCASP0_AXR0 133 U3
MCASP0_AXR1 84 D13
MCASP0_AXR1 53 L16
MCASP0_AXR1 123 V4
MCASP0_AXR2 86 B12
MCASP0_AXR2 73 C12
MCASP0_AXR2 68 H16
MCASP0_AXR2 120 U4
MCASP0_AXR2 146 V2
MCASP0_AXR3 85 A14
MCASP0_AXR3 87 C13
MCASP0_AXR3 124 T5
MCASP0_AXR3 122 V3
MCASP0_FSR 87 C13
MCASP0_FSR 76 J18
MCASP0_FSR 79 V12
MCASP0_FSR 122 V3
MCASP0_FSX 51 B13
MCASP0_FSX 53 L18
MCASP0_FSX 72 and 154 U16
MCASP0_FSX 132 U2

Audio design rules

  • The MCASP consists of independent transmitter and receiver sections with independent clock generation and frames synchronization. For example: If you only need to transfer audio the MCASP0_*R lines are not necessary to be used.
  • The MCASP1 cannot be used.

ADCs

Dedicated ADCs

AM335x includes a touchscreen controller and analog-to-digital converter subsystem. It is an 8-channel general-purpose analog-to-digital converter (ADC) with optional support for interleaving touchscreen (TS) conversions for a 4-wire, 5-wire, or 8-wire resistive panel. This controller can be configured for use in one of the following applications:

  • 8 general-purpose ADC channels
  • 4-wire TSC with 4 general-purpose ADC channels
  • 5-wire TSC with 3 general-purpose ADC channels
  • 8-wire TSC
Name SODIMM pad AM335x pad
VADC 184 -
XN 185 B6
XP 186 C7
YN 187 B7
YP 188 A7
WIPER 189 C8
ADC5 190 B8
ADC6 191 A8
ADC7 192 C9

PWM

Optinal PWM

AM335x includes six PWM peripherals with 16 bits time-base with Period and Frequency control.

Name SODIMM pad AM335x pad
EHRPWM0A 42 and 92 A13
EHRPWM0B 51 B13
EHRPWM1A 133 U3
EHRPWM1B 120 U4
EHRPWM2A 117 U10
EHRPWM2B 125 T10

GPIOs

Optional GPIOs

All the optional SODIMM pins can be used as GPIOs. The following table shows some recommended SODIMM pins to be used as GPIOs:

Name SODIMM pad AM335x pad
KP_COL0 72 U16
KP_COL1 73 C12
KP_COL2 74 C18
KP_COL3 75 U18
KP_ROW0 77 A15
KP_ROW1 78 D14
KP_ROW2 79 V12
KP_ROW3 80 T13
GPIO0 148 V14
GPIO1 149 U14
GPIO2 150 T14
GPIO3 151 U15
GPIO5 153 T16
GPIO6 154 V15
GPIO7 155 R14

CAN

CAN is a vehicle bus standard designed to allow microcontrollers and devices to communicate with each other within a vehicle without a host computer.

Optional CAN

Name SODIMM pad AM335x pad
DCAN0_TX 76 J18
DCAN0_RX 81 K15
DCAN0_TX 65 D18
DCAN0_RX 66 D17
DCAN1_TX 64 D16
DCAN1_RX 63 D15
DCAN1_TX 101 G17
DCAN1_RX 100 G18

Start a new hardware design of own IGEP AQUILA EXPANSION

IGEP AQUILA EXPANSION is an Open Source board designed for fast prototyping of your own projects for IGEP COM AQUILA. You can use the following resources as a model for your design:



You have successfully completed this chapter of the guide.


Continue this tutorial guide: 2/3 - What can I do with IGEP COM AQUILA
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