N2M400FDB311A3CE Datasheet, PDF (5/19 Pages) Micron Technology – e·MMC™ Memory

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Preliminary
Signal Descriptions
4GB, 8GB, 16GB, 32GB: e·MMC
Signal Descriptions
Table 3: Signal Descriptions
Symbol
CLK
RST_n
CMD
DAT[7:0]
V_CC
V_CCQ
V_SS1
V_SSQ1
V_DDI
NC
RFU
Type
Input
Input
I/O
I/O
Supply
Supply
Supply
Supply
–
–
Description
Clock: Each cycle of the clock directs a transfer on the command line and on the data line(s). The
frequency can vary between the minimum and the maximum clock frequency.
Reset: The RST_n signal is used by the host for resetting the device, moving the device to the pre-
idle state. By default, the RST_n signal is temporarily disabled in the device. The host must set ECSD
register byte 162, bits[1:0] to 0x1 to enable this functionality before the host can use it.
Command: This signal is a bidirectional command channel used for command and response trans-
fers. The CMD signal has two bus modes: open-drain mode and push-pull mode (see Operating
Modes). Commands are sent from the MMC host to the device, and responses are sent from the
device to the host.
Data I/O: These are bidirectional data signals. The DAT signals operate in push-pull mode. By de-
fault, after power-on or assertion of the RST_n signal, only DAT0 is used for data transfer. The
MMC controller can configure a wider data bus for data transfer either using DAT[3:0] (4-bit mode)
or DAT[7:0] (8-bit mode). e·MMC includes internal pull-up resistors for data lines DAT[7:1]. Immedi-
ately after entering the 4-bit mode, the device disconnects the internal pull-up resistors on the
DAT[3:1] lines. Upon entering the 8-bit mode, the device disconnects the internal pull-ups on the
DAT[7:1] lines.
V_CC: NAND interface (I/F) I/O and NAND Flash power supply.
V_CCQ: e·MMC controller core and e·MMC I/F I/O power supply.
V_SS: NAND I/F I/O and NAND Flash ground connection.
V_SSQ: e·MMC controller core and e·MMC I/F ground connection.
Internal voltage node: At least a 0.1μF capacitor is required to connect V_DDI to ground. A 1μF ca-
pacitor is recommended. Do not tie to supply voltage or ground.
No connect: No internal connection is present.
Reserved for future use: No internal connection is present. Leave it floating externally.
Note: 1. V_SS and V_SSQ are connected internally.
PDF: 09005aef84a4d6f1
emmc_4gb_8gb_16gb_32gb_100b-it.pdf - Rev. C 7/12 EN
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