Libraries GuideChapter 11: Design Elements (X74_42 to X74_521)
X74_154
4- to 16-Line Decoder/Demultiplexer with Two Enables and Active-Low Outputs
XC3000
| XC4000E
| XC4000X
| XC5200
| XC9000
| Spartan
| SpartanXL
| Spartan2
| Virtex
|
|---|
Macro
| Macro
| Macro
| Macro
| Macro
| Macro
| Macro
| N/A
| N/A
|
When the active-Low enable inputs G1 and G2 of the X74_154 decoder/demultiplexer are Low, one of 16 active-Low outputs, Y15 - Y0, is selected under the control of four binary address inputs A, B, C, and D. The non-selected inputs are High. Also, when either input G1 or G2 is High, all outputs are High.
The X74_154 can be used as a 16-to-1 demultiplexer by tying the data input to one of the G inputs and tying the other G input Low.
Inputs
| Outputs
|
|---|
G1
| G2
| D
| C
| B
| A
| Y15
| Y14
| Y13
| Y12
| Y11
| Y10
| Y9
| ... Y0
|
|---|
1
| X
| X
| X
| X
| X
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| ... 1
|
X
| 1
| X
| X
| X
| X
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| ... 1
|
0
| 0
| 1
| 1
| 1
| 1
| 0
| 1
| 1
| 1
| 1
| 1
| 1
| ... 1
|
0
| 0
| 1
| 1
| 1
| 0
| 1
| 0
| 1
| 1
| 1
| 1
| 1
| ... 1
|
0
| 0
| 1
| 1
| 0
| 1
| 1
| 1
| 0
| 1
| 1
| 1
| 1
| ... 1
|
-
| -
| -
| -
| -
| -
| -
| -
| -
| -
| -
| -
| -
| ... -
|
-
| -
| -
| -
| -
| -
| -
| -
| -
| -
| -
| -
| -
| ... -
|
-
| -
| -
| -
| -
| -
| -
| -
| -
| -
| -
| -
| -
| ... -
|
0
| 0
| 0
| 0
| 0
| 0
| 1
| 1
| 1
| 1
| 1
| 1
| 1
| ... 0
|
Figure 11.12 X74_154 Implementation XC3000, XC4000E, XC4000X, XC5200, XC9000, Spartan, SpartanXL