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11–8
Chapter 11: Using the State Machine Library
Using the State Machine Editor Block
4. The first page of the wizard allows you to choose the reset mode, whether the reset
is active-high or active-low, and whether the outputs are registered. Accept the
default values (synchronous, active-high, registered outputs) and click Next to
display the Transitions page of the wizard.
5. Delete the default state names ( state1 , state2 , state3 ) and type the following
new state names:
■
■
■
■
■
empty
full
idle
pop_not_empty
push_not_full
6. Delete the default input port names ( input1 , input2 ) and type the following new
input port names:
■
■
■
count_in[7:0]
pop
push
1
Do not change the clock and reset port names. The count_in port must be
defined as an 8-bit vector to allow count values up to 250.
7. Edit the state transitions by entering the statements ( Table 11–1 ).
Table 11–5. FIFO Controller Transitions
Source State
empty
empty
full
full
idle
idle
idle
idle
pop_not_empty
pop_not_empty
pop_not_empty
pop_not_empty
pop_not_empty
push_not_full
push_not_full
push_not_full
push_not_full
push_not_full
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
Destination State
push_not_full
idle
idle
pop_not_empty
empty
push_not_full
pop_not_empty
full
idle
empty
push_not_full
pop_not_empty
full
idle
empty
push_not_full
full
pop_not_empty
Condition
(push==1)&(count_in!=250)
(push==0)&(pop==0)
(push==0)&(pop==0)
(pop==1)
(pop==1)&(count_in==0)
(push==1)
(pop==1)&(count_in!=0)
(push==1)&(count_in==250)
(push==0)&(pop==0)
(pop==1)&(count_in==0)
(push==1)&(count_in!=250)
(pop==1)&(count_in!=0)
(push==1)&(count_in==250)
(push==0)&(pop==0)
(pop==1)&(count_in==0)
(push==1)&(count_in!=250)
(push==1)&(count_in==250)
(pop==1)&(count_in!=0)
November 2013 Altera Corporation
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