Finer grain dynamic random access memory
Systems, apparatuses, and methods related to dynamic random access memory (DRAM), such as finer grain DRAM, are described. For example, an array of memory cells in a memory device may be partitioned into regions. Each region may include a plurality of banks of memory cells. Each region may be associated with a data channel configured to communicate with a host device. In some examples, each channel of the array may include two or more data pins. The ratio of data pins per channel may be two or four in various examples. Other examples may include eight data pins per channel.
1. A memory device, comprising:
an array of memory cells with a plurality of regions that each comprise a plurality of banks of memory cells;
a plurality of channels traversing the array of memory cells, wherein a channel of the plurality of channels comprises a first set of one or more pins positioned within the channel and the channel intersects a region of the plurality of regions, wherein the channel is directly coupled to both a first bank of memory cells of the region positioned on a first side of the channel and a second bank of memory cells of the region positioned on a second side of the channel opposite the first side, and wherein each pin of the first set of one or more pins is directly coupled to both the first bank of memory cells and the second bank of memory cells; and
a channel interface associated with the region and configured to communicate signals between the first bank of memory cells and the second bank of memory cells in the region with a host device using the first set of one or more pins.
2. The memory device of claim 1 , further comprising:
input/output (I/O) areas extending across the array of memory cells, the I/O areas occupying an area of the array of memory cells that is devoid of memory cells, wherein the I/O areas comprise the plurality of channels.
3. The memory device of claim 2 , wherein the I/O areas comprise through-silicon vias (TSVs) configured to couple the array of memory cells with a power node or a ground node.
4. The memory device of claim 1 , further comprising:
a plurality of channel interfaces distributed in the array of memory cells, the plurality of channel interfaces comprising the channel interface associated with the region.
5. The memory device of claim 4 , wherein the plurality of channel interfaces are bump-outs.
6. The memory device of claim 5 , wherein the channel interface associated with the region is positioned in a quadrant of the array of memory cells.
7. The memory device of claim 4 , further comprising:
a plurality of signal paths extending between memory cells of the region and the channel interface associated with the region.
8. The memory device of claim 1 , further comprising:
a second array of memory cells stacked on top of the array of memory cells, the second array of memory cells having regions that each comprise a second plurality of banks of memory cells; and
a second plurality of channels traversing the second array of memory cells, wherein each of the channels of the second plurality of channels is directly coupled with a second region of the second array of memory cells and is configured to communicate signals between the second plurality of banks of memory cells in the second region with the host device.
9. The memory device of claim 1 , wherein the channel establishes a point-to-point connection between the region and the host device.
10. A memory device, comprising:
an array of memory cells with regions that each comprise a plurality of banks of memory cells;
input/output (I/O) areas extending across the array of memory cells, the I/O areas including a plurality of terminals configured to route signals to and from the array of memory cells;
a plurality of channels positioned in the I/O areas of the array of memory cells, wherein a channel of the plurality of channels comprises a first set of one or more pins positioned within the channel and the channel intersects a region of the array of memory cells, wherein the channel is directly coupled to both a first bank of memory cells of the region positioned on a first side of the channel and a second bank of memory cells of the region positioned on a second side of the channel opposite the first side, and wherein each pin of the first set of one or more pins is directly coupled to both the first bank of memory cells and the second bank of memory cells; and
a channel interface associated with the region and configured to communicate signals between the first bank of memory cells and the second bank of memory cells in the region with a host device using the first set of one or more pins.
11. The memory device of claim 10 , further comprising:
a plurality of channel interfaces positioned in the I/O areas of the array of memory cells, wherein signal paths couple the regions with the plurality of channel interfaces, and wherein the plurality of channel interfaces comprises the channel interface associated with the region.
12. The memory device of claim 11 , wherein the I/O areas include through-silicon vias (TSVs) configured to couple a second array of memory cells stacked on top of the array of memory cells with the channel interface associated with the region.
13. The memory device of claim 11 , wherein the channel interface of the region is positioned within a first I/O area of the I/O areas that bisects the region serviced by the channel interface.
14. The memory device of claim 10 , wherein the I/O areas include through-silicon vias (TSVs) configured to couple the array of memory cells with a power node or a ground node.
15. The memory device of claim 10 , wherein the I/O areas occupy an area of the array of memory cells that is devoid of memory cells.
16. The memory device of claim 10 , wherein the array of memory cells is bisected by two I/O areas or four I/O areas.
17. A system, comprising:
a host device;
a memory device comprising a memory die with a plurality of regions that each comprise a plurality of banks of memory cells; and
a plurality of channels configured to communicatively couple the host device and the memory device, wherein a channel of the plurality of channels comprises a first set of one or more pins positioned within the channel and the channel intersects a region of the plurality of regions, wherein the channel is directly coupled to both a first bank of memory cells of the region positioned on a first side of the channel and a second bank of memory cells of the region positioned on a second side of the channel opposite the first side, and wherein each pin of the first set of one or more pins is directly coupled to both the first bank of memory cells and the second bank of memory cells; and
a channel interface associated with the region and configured to communicate signals between the first bank of memory cells and the second bank of memory cells in the region with the host device using the first set of one or more pins.
18. The system of claim 17 , further comprising:
an interface configured for bidirectional communication with the host device, wherein the interface is configured to communicate signals modulated using at least one of non-return to zero (NRZ) modulation scheme or a four-symbol pulse-amplitude modulation (PAM4) scheme, or both.
19. The system of claim 17 , wherein the host device comprises a graphics processing unit (GPU).
20. The system of claim 17 , wherein the memory device is positioned in a same package as the host device.
21. The memory device of claim 1 , wherein the channel is coupled with the channel interface associated with the region and is configured to communicate signals between each memory cell of the first bank of memory cells and each memory cell of the second bank of memory cells in the region with the host device.
22. The memory device of claim 1 , further comprising:
one or more additional arrays of memory cells stacked on top of the array of memory cells, wherein at least one array of memory cells of the one or more additional arrays of memory cells comprises a second plurality of regions that each comprise a second plurality of banks of memory cells; and
a second channel positioned within a second region of the second plurality of regions with at least a third bank of memory cells of the second region positioned on a first side of the second channel and a fourth bank of memory cells of the second region positioned on a second side of the second channel opposite the first side, wherein the second channel comprises a second set of one or more pins, wherein the second channel is coupled with a second channel interface associated with the second region and is configured to communicate signals between the third bank of memory cells and the fourth bank of memory cells in the second region with the host device using the second set of one or more pins, wherein a first quantity of pins included within the first set of one or more pins, a second quantity of pins included within the second set of one or more pins, or both, is based at least in part on a quantity of memory arrays included within the one or more additional arrays of memory cells.