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circuit to Convert 16 bit to 8 bit

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heythem2008

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i want to convert my signal from the output of fifo from 16 bit to 8 bit because i need to transmit it via the rS232 that support only the 8 bit
so who can help me to do this task
if it is possible a logic circuit because i m working with block diagram in quartus software of altera
 

heythem2008 said:
/.../signal from the output of fifo from 16 bit to 8/.../
Click to expand...
no quartus sch. I have no experience with it;
you have to:
- create 16 to 8 multiplexer and connect its inputs to the fifo;
- divide the RS232 clock by 2 on a single flip-flop;
- 'Q' output of the divider connect as a control input to the MUX;
- connect [properly!] divided clock as a read clock to the fifo;

-- have fun;
 

a simple way of doing this would be to use a fifo whose data width is 8 bit itself, u don't need to write an extra glue logic outside the fifo.

While writing into the fifo, increment the write pointer by 2 for each write and write the 16bit data as two 8 bit data.

Read pointer should be incremented by 1 as expected.

This is one of the possible options i can think of. Also, u can use the mux as explained above.
 

If you are using xilinx devices it's too easy. Xilinx devices have block ram which are dual port/ you can easily use it as a dual port FIFO with different width. It's too easy check xilinx documents.
 

thank you sree205 for answering me, i cant use a fifo with 8bit width because with my quartus software i cant design a fifo with 16bit input and 8 bit output, the width of input and output must be the same,

Added after 2 minutes:

thank u zerox, yes if i'm working with xilinx it will be better, but i have no choice i m in a trainee and only this altera board that i have
 

Use a 16:8 Mux with a toggling register logic! if toggle register is 1 then get a new value from 16 bit FIFO and use low 8 bit, if toggle register is 0 use high 8 bit. It's a good approach
 

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