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3-Feb-2015
5
2.2.3
eMMC (Multi-Media Controller)
PicoZed 7010/7020 features a Micron MTFC4GMDEA-4M IT eMMC Multi Media Controller and
NAND Flash IC. The eMMC is used to provide non-volatile user data storage.
The relevant device attributes are:
4GB (default)
Optional densities available via customization
Industrial temperature range (-40 to +85 C)
4-bit data interface
52MHz max clock speed
Table 3
– eMMC Pin Assignment and Definitions
Signal Name
Description
Zynq Pin
MIO
eMMC Pin
EMMC_IO0
Data 0
E9 (MIO Bank 0/500)
10
H3
EMMC CMD
Command
C6 (MIO Bank 0/500)
11
W5
EMMC_CLK
Clock
D9 (MIO Bank 0/500)
12
W6
EMMC_IO1
Data 1
E8 (MIO Bank 0/500)
13
H4
EMMC_IO2
Data 2
C5 (MIO Bank 0/500)
14
H5
EMMC_IO3
Data 3
C8 (MIO Bank 0/500)
15
J2
The eMMC connects to the Zynq PS via six signals by way of two 4-bit MUXs.
The eMMC I/O is multiplexed with direct connections to the Zynq MIO PS_MIO[0, 15:9] pins
allowing the user to use the JX2 MIO[0, 15:9] pins as standard I/O or have access to the eMMC
I/O. The Zynq PS_MIO0 pin can be used as the multiplexer select control signal to give the user
software control to select either interface in real time. Software control and hardware control of
the multiplexer select line is discussed in further detail below.
Software Control of Multiplexer Select
If the user wishes to use software to control the multiplexer select the Zynq PS_MIO0 pin is
utilized. When software controls the multiplexer select signal, the running application can select
either eMMC accesses for the Zynq or standard MIO interfaces via the JX2 connector. When
using software to control the multiplexer select signal, the JX2 MIO interface becomes limited to 7
I/O pins, MIO[15:9] since the Zynq PS_MIO0 pin is being used to control the multiplexer select
signal. This option offers the user the most flexibility to connect either interface to the Zynq when
needed by the application.
Software control of the Multiplexer Select signal is the default setting for the PicoZed 7010/7020
System-On-Module from the factory, and is enabled by the jumper resistor position at JT1
position 1-2.
In position 1-2 the Zynq PS_MIO0 pin is connected to the multiplexer select pins of U1 and U2.
In position 2-3 the Zynq PS_MIO0 pin is connected to the JX2 MIO0 pin via the multiplexer
channel 4 on device U2.
Hardware Control of Multiplexer Select (Interface Strapping)
Another user option available is to “hard-wire” one of the two interfaces, JX2 MIO[0,15:9] or
eMMC I/O to the Zynq PS_MIO[0,15:9] pins. This can be done by modifying the resistor jumper
position at JT2, which sets the desired interface and JT1, which controls the use of PS_MIO0.
The default resistor jumper position for JT2 is 1-2, which selects the eMMC as the selected
interface
.