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26 | Spark-100 HW user manual v1.3
An 8GByte option is available as an ordering option.
2.6.4
SD/eMMC interface
The SPARK-100 has a single SD/MMC bus connected to the HPS. The HPS is connected via an internal
multiplexer (TXS02612 - SDIO Port Expander by TI) to either an internal 4/8 bits wide eMMC or to an
external 4 bits SD interface.
The control of the mux is done by GPIO44 of the HPS, ‘0’ – eMMC, ‘1’ - external SD. The mux can be
controlled also via an external pin P123 in the SMARC interface.
The pin can be tight to the required mode or alternatively in order to leave the control to the software
connect to an external pull up or pull down according to the required mode.
2.6.5
Boot options
The Altera SOC offers several boot options. These options are selected according to three pins (bsel 2-0).
The Spark support only part of these options due to that bsel 0 is tight to '1' internally . The other two
pins are connected to the SMARC interface, Bsel1 1 is P124 Bsel2 – P125 offering the following options:
Bsel value
Boot source
Support
000
Reserved
Not supported
001
FPGA (HPS-to-FPGA bridge)
Supported both pins should be
set '0'
010
1.8 V NAND flash memory
Not supported
011
3.0 V NAND flash memory
Not supported
100
1.8 V SD/MMC flash memory with external
transceiver
Not supported
101
3.0 V SD/MMC flash memory with internal
transceiver*
Supported, Bsel 1 should be tight
to '0'
110
1.8 V SPI or quad SPI flash memory
Not supported
111
3.0 V SPI or quad SPI flash memory
Supported, both pins should be
left open
* Note: If SD/eMMC mode is selected then the selection between SD and eMMC can be done as
described in section 2.6.4.
2.6.6
DDR memory
The SPARK-100 integrates 32 bit wide DDR3 running at 400 MHz. The basic configuration is two chips of
256MBx16 (1GB solution). There is also an ordering options for 128MBx16 (512MB solution) and
512MBx16(2GB solution).
The DDR solution supports an 8 bit ECC option – special ordering option, contact
for more details.
Содержание Spark-100
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