4 * [JZ4720](https://web.archive.org/web/20110904201104/http://en.ingenic.cn/product.aspx?ID=60) 336 MHz MIPS compatible processor from [Ingenic Semiconductor Co.](http://www.ingenic.cn)
6 * 3.0" 320x240 pixels [[LCD|colour TFT LCD]] (40x15 character in a text console)
10 * 2GB [[NAND|NAND Flash]] Memory
12 * 1 [[SD|microSDHC]] slot (SDIO capable)
16 * Stereo headphones connector, mono speaker and microphone [[Audio_IN_OUT|audio interfaces]].
18 * [USB](http://wiki.qi-hardware.com/wiki/USB_host) 2.0 High-Speed Device, [Mini B](http://en.wikipedia.org/wiki/USB#Connector_types) connector
20 * 3.7V 850mAh Li-ion Battery ( [[Compatible_batteries|Compatible batteries]]) and 5V 500mA [[Power_Supply_Circuit|DC input through USB port]]
22 * Measured battery life time, idle, screen off: 12h59
24 * Overall dimension (lid closed): 99 * 75 * 17.5mm. (display: 7.5mm, keyboard: 10mm)
26 * Weight: 126g (includes battery)
30 * Flashing bootloader, kernel, and rootfs via USB works.
31 * Serial console via GND/RXD/TXD pads under the battery works.
33 ** After a few minutes of inactivity on the console, it will go blank. Pressing any key brings it back.
42 '''Micro-SD pins on testpads:'''
47 #2 TP15 cd/data3 / _CS
49 #4 sdVCC switched by Q4 (fet?) controlled via line from cpu (on TP11)
57 See [[Ben_source_code#serial_console]].
59 == System information ==
61 $ '''cat /proc/cpuinfo'''
64 cpu model : Ingenic JZRISC V4.15
66 wait instruction : yes
67 microsecond timers : no
69 extra interrupt vector : yes
70 hardware watchpoint : yes, count: 1, address/irw mask: [0x0fff]
72 shadow register sets : 1
74 VCED exceptions : not available
75 VCEI exceptions : not available
78 dev: size erasesize name
79 mtd0: 00400000 00080000 "NAND BOOT partition"
80 mtd1: 00400000 00080000 "NAND KERNEL partition"
81 mtd2: 20000000 00080000 "NAND ROOTFS partition"
82 mtd3: 5f800000 00080000 "NAND DATA partition"
85 Linux BenNanoNote 2.6.32.27 #1 PREEMPT Sat Mar 5 03:54:50 MSK 2011 mips GNU/Linux
87 $ '''cat /proc/iomem'''
88 00000000-01ffffff : System RAM
89 00010000-0031162b : Kernel code
90 0031162c-0040877f : Kernel data
91 10003000-10003037 : jz4740-rtc
92 10003000-10003037 : jz4740-rtc
93 10020000-10020037 : jz4740-i2s
94 10020000-10020037 : jz4740-i2s
95 10020080-10020087 : jz4740-codec
96 10020080-10020087 : jz4740-codec
97 10021000-10030fff : jz4740-mmc.0
98 10021000-10030fff : jz4740-mmc
99 10070000-10070030 : jz4740-adc
100 10070000-10070030 : jz4740-adc
101 13010000-1301ffff : jz4740-nand.0
102 13010000-1301ffff : jz4740-nand
103 13030000-1303ffff : jz-ohci.0
104 13040000-1304ffff : jz-udc
105 13040000-1304ffff : jz-udc
106 13050000-1305ffff : jz4740-fb
107 13050000-1305ffff : jz4740-fb
109 $ '''cat /proc/interrupts'''
111 2: 33611 MIPS JZ4740 cascade interrupt
113 20: 56 INTC jz4740-adc
115 23: 0 INTC jz4740-rtc
117 31: 32374 INTC jz4740-timerirq
119 147: 0 GPIO Bank C jz4740-battery
120 152: 0 GPIO Bank D MMC/SD detect changed
121 170: 0 GPIO Bank D matrix-keypad
122 171: 94 GPIO Bank D matrix-keypad
123 172: 77 GPIO Bank D matrix-keypad
124 173: 17 GPIO Bank D matrix-keypad
125 174: 151 GPIO Bank D matrix-keypad
126 175: 13 GPIO Bank D matrix-keypad
127 176: 235 GPIO Bank D matrix-keypad
128 178: 0 GPIO Bank D matrix-keypad
129 180: 0 GPIO Bank D gpio-charger.0
130 181: 0 GPIO Bank D Power
135 The Jz4720 has only a limited number of pins as outputs to the board. Furthermore, several functions take up gpio pins which are therefore not usable for other functions. Those devices are the sdram and nand controller, lcd controller and mmc+sd controller. Below is a table showing how they are used. Please complete this table. The missing entries are not connected to a pad in the Jz4720.
166 * 10 sdram address 10
167 * 11 sdram address 11
168 * 12 sdram address 12
169 * 13 sdram address 13
170 * 14 sdram address 14
171 * 15 nand command latch
172 * 16 nand address latch
173 * 17 not connected (was marked "SHDN_HOST???", but schematic disagrees)
178 * 22 sdram write enable
183 * 27 not connected (was marked "USB ID", but schematic disagrees)
185 * 29 Audio output enable (anti-pop control)
187 * 31 sdram write enable 0
200 * 10 keyboard out 1, TP59
201 * 11 keyboard out 2, TP60
202 * 12 keyboard out 3, TP61
203 * 13 keyboard out 4, TP62
204 * 14 keyboard out 5, TP63
205 * 15 keyboard out 6, TP64
206 * 16 keyboard out 7, TP65
207 * 17 keyboard out 8, TP66
211 * 21 lcd SPI chipselect
214 * 24 sdram write enable 1
215 * 27 Charge detect (analog input to read battery voltage).
216 * 28 nand read enable
217 * 29 nand write enable
218 * 30 nand flash ready/busy
219 * 31 not connected to a pad; PCSEL31 selects jtag (PCSEL31==0) or uart0 (PCSEL31==1) on pad 147(TxD)+148(RxD) (TP5+TP4).
223 * 02 SD Card power enable
224 * 04 Speaker AMP enable (no audio unless this output is pulled low).
225 * 06 Low power indicator (if 0, battery power is low).
233 * 18 Keyboard in 1, TP67
234 * 19 Keyboard in 2, TP68
235 * 20 Keyboard in 3, TP69
236 * 21 Keyboard in 4, TP70
237 * 22 Keyboard in 5, TP71
238 * 23 Keyboard in 6, TP72
239 * 24 Keyboard in 7, TP73
240 * 25 uart0 transmit, TP75
241 * 26 Keyboard in 8 (uart0 receive), TP74
242 * 27 Buzzer, controlled with pwm4. Piezo-electric buzzer; not related to soundcard output.
243 * 28 USB detect (0 if usb power is present).
244 * 29 power button (0 if pressed).
246 === Sorted by function ===
250 * keyboard: C10, C11, C12, C13, C14, C15, C16, C17, D18, D19, D20, D21, D22, D23, D24, D26(also uart receive)
251 * uart: C31, D25, D26(also keyboard), uart is also available on jtag pads TP4+TP5 (without gpio overload).
252 * sd/mmc: D0, D2, D8, D9, D10, D11, D12, D13
255 * sdram: A1, A3, A5, A7, A8, A9, A10, A11, A12, A13, A15, A17, A22, A26, A28, A30, B0, B1, B2, B3, B4, B5, B6, B7, B8, B9, B10, B11, B12, B13, B14, B19, B10, B21, B22, B23, B24, B25, B26, B31, C24
256 * nand: B15, B16, C28, C29, C30
257 * lcd: C0, C1, C2, C3, C4, C5, C6, C7, C18, C19, C20, C21, C22, C23
258 * only test points: B18, B30, C8, C9, D15
259 * unconnected pads: B17, B27, B28
261 [[Category:Ben NanoNote]]
263 This content is dual licensed under CC-BY-SA and GFDL and was obtained from [http://en.qi-hardware.com/wiki/Hardware-Ben](http://en.qi-hardware.com/wiki/Hardware-Ben)