HTC Android Phone Font

Font, also known as Flash, Flash ROM flash read-only memory.

It loads the phone's basic program and various functional programs in the form of code. So far the concept of the word font mixed, very unclear, in the end what is the font?

In fact, we can distinguish between them, it is easier to understand.

Font, generally can be called Program memory (called program) and Chinese character Library memory (Word save), then why people do not call it?

This is because the previous mobile phone design of the Chinese font as a memory chip welding on the phone, the program memory version also as another storage welding on the phone, and later developed to the program and word stored together, so we call it a font.

The capacity of the font is much larger than the size of the code, the common 32M 64 and 128M. The role of the font in mobile phones is very important, the role of the specific functions as follows:

1 Storage Host Main program

2 Storing the font information

3 Storing Network information

4 Storage Recording

5 Storing encrypted information

6 Storage Serial Number (IMEI code)

7 Storage Operating System Flash

According to the operating voltage is divided into:

5V, 3.3V, 1.8V, 0.9V

Divided by data bus width:

8-bit data bus width

16-bit data bus width of two

divided by its bus and data:

(1) Bus and data bus separation

(2) Low 16-bit address bus and data bus merging

(3) Address bus select、read and data bus merging

According to its sector distribution is divided into:

Top, bottom two species;

The package form is divided into:

TSOP40, TSOP48, FBGA48, UBGA56 FBGA72 BGA80, etc.

According to its foot tube of how much, the cell phone can also be divided into two major categories:

A class of 40-foot font (such as model 28f004,28f008)

Another type of 48-foot font (such as model 28f800,28f160f160, etc.)

The working process of the font is more complicated:

When the phone is turned on, the CPU will be outgoing a reset signal rest through the font, so that the system reset.

And then to the CPU to read and write the font, the selection of the end of the chip, the CPU can be taken out of the library instructions,

In the CPU operation, decoding, output parts coordinated work commands, thus completing their respective functions.

Font (FLASH) program storage software information is through the data exchange, address switching terminals and microprocessors to communicate.

CE (CS) end for the selection of the font, OE end is read allowed, rest end for the system reset end, the four control ends are controlled by the CPU.

If the address of the font is incorrect or not selected, will cause the mobile phone does not work, usually performance is not on the boot, display character disorder and other symptoms.

Because the font can be used to erase, so when there is data loss can be written in a programmer or a machine-free maintenance instrument.

As with the page number, the font itself may be damaged (both hardware failure), if the hardware failure, it is necessary to replace the font.