Refer to Figure 12-7.

(a) What register is enabled by input address 1011?

(b) What input address code selects register 4?

Figure 12-7

CS OE- Ao A A A ROW SELECT 1-of-4 decoder MSB E 0 1 2 3 COLUMN SELECT 10 1-of-4 decoder 1 2 3 MSB E Row 0 Row 1 Row 2 Row 3 Column 0 Column 1 Column 2 Column 0 Register 0 E Register 1 Register 2 E Register 3 Column 3 Column 1 Register 4 E U Register U Register 6 E Register 7 Column 2 -CE Register 8 E Register 9 Register 10 E [8] E Register 11 E Output buffers D Ds Dg DD D D Do Column 3 Register 12 E Register 13 E Register 14 E E Register 15 E