Hybrid density memory system and control method thereof
First Claim
1. A hybrid density memory system which is applicable to allow a host to access user data, in which the host has a storage space consisting of a plurality of logical units for accessing the user data, which hybrid density memory system comprising:
- a storage module, which consists of a high density memory unit formed by high density memories and a low density memory unit formed by low density memories, wherein the high density memory unit is divided into a plurality of physical units as the storage space to facilitate one-to-one correspondence with such logical units, with each one of the physical units including a plurality of physical blocks; and
a control module, which is coupled between the host and the storage module, used to transfer user data to the high density memory unit or the low density memory unit based on the properties of the user data.
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Abstract
A control method of a memory system for accessing an updated data between a host and the memory system is provided. The host has storage space which is divided into a plurality of logical segments to access the data. The system includes a high density memory and a low density memory, and the high density memory includes a plurality of physical segments to access the data. The control method includes the following steps: first, providing a LDM table in the memory system to indicate the allocation information of the low density memory; finally, deciding where the data is written to is according to its properties and the LDM table.
83 Citations
24 Claims
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1. A hybrid density memory system which is applicable to allow a host to access user data, in which the host has a storage space consisting of a plurality of logical units for accessing the user data, which hybrid density memory system comprising:
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a storage module, which consists of a high density memory unit formed by high density memories and a low density memory unit formed by low density memories, wherein the high density memory unit is divided into a plurality of physical units as the storage space to facilitate one-to-one correspondence with such logical units, with each one of the physical units including a plurality of physical blocks; and a control module, which is coupled between the host and the storage module, used to transfer user data to the high density memory unit or the low density memory unit based on the properties of the user data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A control method for the hybrid density memory system which is applicable for user data access between a host and the hybrid density memory system, wherein the host has a plurality of logical units as the storage space to access the user data, and the hybrid density memory system has a high density memory unit and a low density memory unit, which high density memory unit providing a plurality of physical units as the storage space to one-to-one correspond to the logical units, each of the physical units including a plurality of physical blocks, which control method comprising the following steps:
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providing a Low Density Memory table (LDM table) in the hybrid density memory system to record the allocation information about the storage space of the low density memory unit; and transferring the user data to the high density memory unit or the low density memory unit based on the properties of the user data and the contents of the LDM table. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification