Libraries GuideChapter 11: Design Elements (X74_42 to X74_521)
X74_352
Dual 4-to-1 Multiplexer with Active-Low Enables and Outputs
XC3000
| XC4000E
| XC4000X
| XC5200
| XC9000
| Spartan
| SpartanXL
| Spartan2
| Virtex
|
|---|
Macro
| Macro
| Macro
| Macro
| Macro
| Macro
| Macro
| N/A
| N/A
|
X74_352 comprises two 4-to-1 multiplexers with separate enables (G1 and G2) but with common select inputs (A and B). When an active-Low enable (G1 or G2) is Low, the multiplexer chooses one data bit from the four sources associated with the particular enable (I1C3 - I1C0 for G1 and I2C3 - I2C0 for G2) under the control of the common select inputs (A and B). The active-Low outputs (Y1 and Y2) reflect the inverse of the selected data as shown in truth table. Y1 is associated with G1 and Y2 is associated with G2. When an active-Low enable is High, the associated output is High.
Inputs
| Outputs
|
|---|
G
| B
| A
| IC0
| IC1
| IC2
| IC3
| Y
|
|---|
1
| X
| X
| X
| X
| X
| X
| 1
|
0
| 0
| 0
| IC0
| X
| X
| X
| !IC0
|
0
| 0
| 1
| X
| IC1
| X
| X
| !IC1
|
0
| 1
| 0
| X
| X
| IC2
| X
| !IC2
|
0
| 1
| 1
| X
| X
| X
| IC3
| !IC3
|
Figure 11.40 X74_352 Implementation XC3000, XC4000E, XC4000X, XC5200, XC9000, Spartan, SpartanXL