Connector J4 (70-pin): Extended Memory Bus & MMC Signals

 

The Signals Document, posted as a download on this page, provides a detailed reference for all external electrical signals from the Overo COM.

 

Design Notes for Connector J4:

  1. All logic is at 1.8V

  2. The input range of the supply voltage is approximately 3.3V – 4.2V.

  3. The signals of connectors J1, J4 and J5 are connected directly to the OMAP35xx without buffers.

  4. The signals named EM_x are connected to the OMAP GPMC interface (named GPMC_x in OMAP documents).

  5. USBH interface supports high speed USB (480MBs).

  6. J4-46 (4030GP2_N_MMC3_CD) = Card Detect signal for MMC3. It comes from the PMIC. Expansion board schematics may refer to pin 46 as GPIO149_MMC3_CD. The correct signal name, as shown in this table, is 4030GP2_N_MMC3_CD.

  7. The physical location of pin 1 of the J1 connector can be found in the layout information posted at pubs.gumstix.com (see COMs section)

  8. Last update Sept 22nd, 2011

Comments Signal Pin Pin
Signal Comments
board supply: 3.3V - 4.2V VSYSTEM 1
70 EM_CLK
board supply: 3.3V - 4.2V VSYSTEM 2 69 EM_NBE1

GND
3 68 EM_WAIT0

EM_NCS5_ETH0
4 67 EM_NCS6

EM_NCS4 5 66 EM_NCS0

EM_NWE 6 65 EM_NBE0

EM_NADV_ALE 7 64 EM_NCS1

EM_NOE 8 63 EM_NWP

GPIO65_ETH1_IRQ1 9 62 EM_A9

GPIO64_ETH0_NRESET 10 61 EM_A4

EM_A2 11 60 EM_A10

EM_A8 12 59 EM_A3

EM_A5 13 58 EM_A1

EM_A7 14 57 EM_A6

EM_D2 15 56 EM_D0

EM_D10 16 55 EM_D9

EM_D3 17 54 EM_D8

EM_D11 18 53 EM_D1

EM_D4 19 52 EM_D13

EM_D12 20 51 EM_D6

EM_D5
21 50 EM_D14

EM_D15 22 49 EM_D7

GPIO13_MMC3_CMD 23 48 GPIO151_RXD1

GPIO148_TXD1 24 47 GPIO150_MMC3_WP

GPIO176_ETH0_IRQ 25 46 4030GP2_N_MMC3_CD Card Detect signal for MMC3. Comes from PMIC

GPIO18_MMC3_D0 26 45 GPIO173_SPI1_MISO

GPIO174_SPI1_CS0 27 44 GPIO172_SPI1_MOSI

GPIO168_USBH_CPEN 28 43 GPIO171_SPI1_CLK

GPIO14_MMC3_DAT4 29 42 GPIO175_SPI1_CS1

GPIO21_MMC3_DAT7 30 41 GPIO114_SPI1_NIRQ

GPIO17_MMC3_D3 31 40 GPIO12_MMC3_CLK
power in from expansion board
USBH_VBUS 32 39 GPIO20_MMC3_D2

GND 33 38 GPIO23_MMC3_DAT5

USBH_DP 34 37 GPIO22_MMC3_DAT6

USBH_DM 35 36 GPIO19_MMC3_D1

 

Home Hardware Design Overo Series Overo Series Signals and Connectors Connector J4 (70-pin): Extended Memory Bus & MMC Signals