Switched interface for stacked-die memory architecture with redundancy for substituting defective memory cells
Systems and methods disclosed herein include those that may receive a memory request including a requested memory address and may send the memory request directly to an address decoder associated with a stacked-die memory vault without knowing whether a repair address is required. If a subsequent analysis of the memory request shows that a repair address is required, an in-process decode of the requested memory address can be halted and decoding of the repair address initiated.
1. An apparatus, comprising:
a plurality of stacked memory dies including a first memory die and a second memory die;
a memory vault formed from stacked memory arrays of the plurality of stacked memory dies, the stacked memory arrays including a first memory array in the first memory die and a second memory array in the second memory die, wherein the plurality of stacked memory dies are selected such that addresses associated with contiguous areas of defective memory cells in the first memory die used to form the memory vault do not overlap with addresses associated with another contiguous areas of defective memory cells in the second memory die used to form the memory vault; and
a spare memory array included in the memory vault, wherein the memory vault is configured such that at least one first contiguous area of operational memory cells on the spare memory array is located at a starting memory address including at least one of a bank address, a row address, or a column address in common with a second contiguous area of operational memory cells on at least one of the first and second memory dies,
wherein the apparatus further comprising a repair decode assessment module to estimate a latency associated with translating a requested memory address to a repair address; and a decision module to cause the requested memory address to be passed to a memory address decoder associated with the memory vault if the latency estimated by the repair decode assessment module is greater than a selected amount.
2. The apparatus of claim 1 , further comprising a map of defective memory cells associated with each of the plurality of stacked memory dies.
3. The apparatus of claim 1 , further comprising a logic die coupled to the memory vault.
4. The apparatus of claim 3 , wherein the logic die is stacked with the memory vault.
5. The apparatus of claim 1 , further comprising an additional memory vault, the additional memory vault including a third memory array and a fourth memory array, the third memory array located in the first memory die, the fourth memory array located in the second memory die.
6. The apparatus of claim 5 , further comprising a logic die to provide control to the memory vault and the additional memory vault.
7. The apparatus of claim 6 , wherein the logic die is stacked with the memory vault and the additional memory vault.
8. The apparatus of claim 5 , further comprising a first memory vault controller and a second memory vault controller, wherein the first memory vault controller is configured to provide control to the memory vault independent of control provided by the second memory vault controller to the additional memory vault.
9. The apparatus of claim 8 , further comprising a logic die, wherein the first and second memory vault controllers are located on the logic die.
10. The apparatus of claim 9 , wherein the logic die is stacked with the memory vault and the additional memory vault.
11. The apparatus of claim 1 , further comprising at least one repair address lookup table to translate a requested memory address into a repair address.
12. The apparatus of claim 1 , further comprising:
a plurality of repair address lookup tables; and
a bad block logic to select a repair address lookup table from the plurality of repair address lookup tables.
13. The apparatus of claim 12 , further comprising:
an arithmetic logic unit to calculate a repair address using an address offset stored in at least one repair address lookup table.
14. The apparatus of claim 1 , further comprising a partial address decoder to partially decode a requested memory address.
15. The apparatus of claim 14 , further comprising a feedback loop operable to determine whether the requested memory address references a non-defective memory location.