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。Description。The official case for the Raspberry Pi 4. This case ships as two parts made of ABS plastic with access to all USB， HDMI， Audio/Video， USB and Ethernet ports. In addition， a slot on the bottom gives access to the MicroSD card. The top and bottom parts are press fit and comes in two-tone black and gray.

。Description。The GD25Q40C(4M-bit)Serial flash supports the standard Serial Peripheral Interface(SPI)， and supports theDual/Quad SPI：Serial Clock， Chip Select， Serial Data I/O0(SI)， I/O1(SO)， I/O2(WP#)， and I/O3(HOLD#). The Dual I/O data is transferred with speed of 240Mbits/s and the Quad I/O & Quad output data is transferred with speed of 480Mbits/s.。Features。4M-bit Serial Flash。512K-byte。256 bytes per programmable page。Standard， Dual， Quad SPI。High Speed Clock Frequency。120MHz for fast read with 30PF load。Dual I/O Data transfer up to 240Mbits/s。Quad I/O Data transfer up to 480Mbits/s。Software/Hardware Write Protection。Minimum 100，000 Program/Erase Cycles。Data Retention。20-year data retention typical。Single Power Supply Voltage。Full voltage range：2.7～3.6V。Low Power Consumption。1μA typical deep power down current。1μA typical standby current