Method of making PCB circuit modification from multiple to individual chip enable signals
View Patent ↗A semiconductor package is disclosed having a single CE signal during electrical test and a plurality of CE signals during normal operation thereafter. After electrical testing of the memory die during fabrication, the electrical traces carrying the single CE signal from the memory test pad matrix to each of the memory die may be severed. Severing the electrical traces from the memory test pad matrix electrically isolates the multiple electrical traces between the controller die and memory die, and allows separate and individual CE signals between the controller die and memory die during normal usage of the memory die.
1. A method of manufacturing non-volatile storage, the non-volatile storage including a controller die, a plurality of memory die and a memory test pad matrix having a circuit enable signal test pad, the method comprising:
(a) electrically shorting together electrical traces connected between the circuit enable signal test pad and the plurality of memory die;
(b) enabling each of the plurality of memory die during a memory die test process by providing a signal to the circuit enable signal test pad; and
(c) electrically isolating the traces from each other after said step (b).
2. A method of manufacturing non-volatile storage as recited in claim 1 , the electrical traces further coupling the controller die to each of the plurality of memory die, the electrical traces allowing the controller die to enable one or more of the plurality of memory die independently of others of the plurality of memory die after said step (c) of electrically isolating the traces from each other.
3. A method of manufacturing non-volatile storage as recited in claim 1 , said step (a) of electrically shorting together the electrical traces occurring during formation of a conductance pattern where the traces are defined on a substrate to which the controller die and memory die are mounted.
4. A method of manufacturing non-volatile storage as recited in claim 3 , said step (c) of electrically isolating the traces from each other comprising the step of severing the electrical traces.
5. A method of manufacturing non-volatile storage as recited in claim 4 , said step of severing the electrical traces comprising the step of severing the electrical traces with a laser.
6. A method of manufacturing non-volatile storage as recited in claim 4 , said step of severing the electrical traces comprising the step of chemically etching through the electrical traces.
7. A method of manufacturing non-volatile storage as recited in claim 4 , said step of severing the electrical traces comprising the step of punching a portion of the electrical traces.
8. A method of manufacturing non-volatile storage as recited in claim 1 , said step (a) of electrically shorting together the electrical traces occurring after formation of a conductance pattern where the traces are defined on a substrate to which the controller die and memory die are mounted.
9. A method of manufacturing non-volatile storage as recited in claim 8 , said step (a) of electrically shorting together the electrical traces comprising the step (d) of applying an electrical conductor across the electrical traces.
10. A method of manufacturing non-volatile storage as recited in claim 9 , said step (c) of electrically isolating the traces from each other comprising the step (e) of removing the electrical conductor applied in said step (d).
11. A method of manufacturing non-volatile storage as recited in claim 8 , said step (a) of electrically shorting together the electrical traces comprising the step (f) of applying an electrically conductive tape across a gap between the electrical traces.
12. A method of manufacturing non-volatile storage as recited in claim 11 , said step (c) of electrically isolating the traces from each other comprising the step (g) of removing the electrically conductive tape applied in said step (f).
13. A method of manufacturing non-volatile storage as recited in claim 1 , said step (a) of electrically shorting together the electrical traces comprising the step of shorting together the traces by a probe of a testing device contacting the signal enable test pad and electrically coupling the traces together during said step (b).
14. A method of manufacturing non-volatile storage as recited in claim 13 , further comprising the step (h) of forming the circuit enable signal test pad with a plurality of electrically conductive sections separated by electrically insulative sections.
15. A method of manufacturing non-volatile storage as recited in claim 14 , said step (h) of forming the circuit enable signal test pad with a plurality of electrically conductive and insulative sections comprising the step of forming the electrically insulative sections of a plurality of linear sections each extending across the circuit enable signal test pad through a center of the circuit enable signal test pad.
16. A method of manufacturing non-volatile storage as recited in claim 14 , said step (h) of forming the circuit enable signal test pad with a plurality of electrically conductive and insulative sections comprising the step of providing a plurality of linear conductive sections separated by a plurality of linear insulative sections.
17. A method of manufacturing non-volatile storage as recited in claim 14 , said step (h) of forming the circuit enable signal test pad with a plurality of electrically conductive and insulative sections comprising the step of providing a plurality of conductive dots surrounded by insulative sections.
18. A method of manufacturing non-volatile storage as recited in claim 1 , further comprising the step (i) of encapsulating the non-volatile storage within a molding compound, said step (i) leaving the memory test pad matrix and at least a portion of the electrical traces uncovered by molding compound.
19. A method of manufacturing non-volatile storage as recited in claim 18 , said step (i) of encapsulating the non-volatile memory within a molding compound occurring before said step (c) of electrically isolating the traces from each other.
20. A method of manufacturing non-volatile storage as recited in claim 18 , further comprising the step (j) of applying a protective layer over the memory test pad matrix and the portion of the electrical traces left uncovered in said step (i), said step (j) occurring after said step (c) of electrically isolating the traces from each other.
21. A method of manufacturing non-volatile storage, the non-volatile storage including a controller die, a plurality of memory die and a memory test pad matrix having a circuit enable signal test pad, the controller die, plurality of memory die and memory test pad matrix coupled by electrical traces, the method comprising:
(a) electrically shorting together the electrical traces connected between the circuit enable signal test pad and the plurality of memory die;
(b) encapsulating the non-volatile storage within a molding compound, said step (b) leaving the memory test pad matrix and at least a portion of the electrical traces uncovered by molding compound;
(c) enabling each of the plurality of memory die during a memory die test process by providing a signal to the circuit enable signal test pad; and
(d) severing an electrical connection between the electrical traces after said step (c).
22. A method of manufacturing non-volatile storage as recited in claim 21 , further comprising the step (e) of applying a protective layer over the memory test pad matrix and the portion of the electrical traces left uncovered in said step (b), said step (e) occurring after said step (d) of severing an electrical connection between the electrical traces.
23. A method of manufacturing non-volatile storage as recited in claim 21 , said step (a) of electrically shorting together the electrical traces occurring during formation of a conductance pattern where the traces are defined on a substrate to which the controller die and memory die are mounted.
24. A method of manufacturing non-volatile storage as recited in claim 21 , said step (a) of electrically shorting together the electrical traces occurring after formation of a conductance pattern where the traces are defined on a substrate to which the controller die and memory die are mounted.
25. A method of manufacturing non-volatile storage as recited in claim 24 , said step (a) of electrically shorting together the electrical traces comprising the step (f) of applying an electrically conductive tape across a gap between the electrical traces.
26. A method of manufacturing non-volatile storage as recited in claim 21 , said step (d) of severing an electrical connection between the electrical traces comprising the step (g) of removing the electrically conductive tape applied in said step (f).
27. A method of manufacturing non-volatile storage as recited in claim 21 , said step (a) of electrically shorting together the electrical traces occurring during said step (c) by a probe of a testing device contacting the signal enable test pad and electrically coupling the traces together during said step (b).
28. A method of manufacturing non-volatile storage, the non-volatile storage including a substrate, a controller die, a plurality of memory die and a memory test pad matrix having a circuit enable signal test pad, the method comprising:
(a) defining a first set of electrical traces on the substrate electrically coupling the controller die and the plurality of memory die;
(b) defining a second set of electrical traces on the substrate electrically coupling the circuit enable signal test pad to each of the plurality of memory die to allow a signal to the circuit enable signal test pad to enable each of the plurality of memory die together, the second set of electrical traces electrically shorting the first set of electrical traces together;
(c) encapsulating the non-volatile storage within a molding compound, said step (c) leaving the memory test pad matrix and at least a portion of the second set of electrical traces uncovered by molding compound;
(d) enabling each of the plurality of memory die together during a memory die test process by providing a signal to the circuit enable signal test pad; and
(e) laser cutting the second set of electrical traces after said step (d) to allow the controller die to enable one or more of the plurality of memory die independently of others of the plurality of memory die.
29. A method of manufacturing non-volatile storage as recited in claim 28 , further comprising the step (f) of applying a protective layer over the memory test pad matrix and the portion of the electrical traces left uncovered in said step (c), said step (f) occurring after said step (e) of laser cutting the second set of electrical traces.