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Memory (an introduction). Recall the clocked D(data) latch:. C. i. r. c. u. i. t. D. Q. C. L. K. Q. D. Q. S. y. m. b. o. l. C. Q. Aside:Edge triggered/level triggered. A. B. D. A. C. Time. What is the voltage at D?. Edge triggered. C. i. r. c. u. i. t. D. - PowerPoint PPT Presentation
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Slide 1-1
Memory (an introduction)
Digital Techniques Fall 2007 André Deutz, Leiden University
D
CLK
Symbol
Q
Q
Circuit
D Q
C Q
Recall the clocked D(data) latch:
Slide 1-2Aside:Edge triggered/level triggered
Digital Techniques Fall 2007 André Deutz, Leiden University
C
BA D
A
Time
What is the voltage at D?
Slide 1-3
Edge triggered
Digital Techniques Fall 2007 André Deutz, Leiden University
D
Symbol
Q
Q
Circuit
C
BCl ock
D Q
C Q
Slide 1-4
Digital Techniques Fall 2007 André Deutz, Leiden University
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
mem
ory
Word 0
Word 1
Word 2
Word 3
I2I1I0
Data In
Writing to a memory word
Slide 1-5
Digital Techniques Fall 2007 André Deutz, Leiden University
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
mem
ory
Word 0
Word 1
Word 2
Word 3
I2I1I0
Data In
Writing to a memory word
Slide 1-6
Digital Techniques Fall 2007 André Deutz, Leiden University
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
mem
ory
Word 0
Word 1
Word 2
Word 3
I2I1I0
Data In
2 to
4 d
ecod
er
Writing to a memory word
a1
a0
Slide 1-7
Digital Techniques Fall 2007 André Deutz, Leiden University
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
mem
ory
Word 0
Word 1
Word 2
Word 3
I2I1I0
Data In
2 to
4 d
ecod
er
enable
a1
a0
Writing to a memory word
Slide 1-8
Digital Techniques Fall 2007 André Deutz, Leiden University
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
mem
ory
Word 0
Word 1
Word 2
Word 3
I2I1I0
Data In
enable
a1 a0
Writing to a memory word
Slide 1-9
Digital Techniques Fall 2007 André Deutz, Leiden University
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
mem
ory
Word 0
Word 1
Word 2
Word 3
I2I1I0
Data In
2 to
4 d
ecod
er
enable
a1
a0
Writing to a memory word
Slide 1-10
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
mem
ory
Word 0
Word 1
Word 2
Word 3
I2I1I0
Data In
2 to
4 d
ecod
er
a1
a0
Reading a mem word
Slide 1-11
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
mem
ory
Word 0
Word 1
Word 2
Word 3
I2I1I0
Data In
2 to
4 d
ecod
er
enable
a1
a0
Slide 1-12
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
mem
ory
Word 0
Word 1
Word 2
Word 3
I2I1I0
Data In
2 to
4 d
ecod
er
enable
a1
a0
Slide 1-13
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
D Q
CQ
mem
ory
Word 0
Word 1
Word 2
Word 3
I2I1I0
Data In
2 to
4 d
ecod
er
enable
a1
a0
