CN109284238B - Method and system for enhancing stability of eMMC interface - Google Patents
Method and system for enhancing stability of eMMC interface Download PDFInfo
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- CN109284238B CN109284238B CN201811026572.1A CN201811026572A CN109284238B CN 109284238 B CN109284238 B CN 109284238B CN 201811026572 A CN201811026572 A CN 201811026572A CN 109284238 B CN109284238 B CN 109284238B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/10—Program control for peripheral devices
- G06F13/102—Program control for peripheral devices where the programme performs an interfacing function, e.g. device driver
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/16—Handling requests for interconnection or transfer for access to memory bus
- G06F13/1668—Details of memory controller
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
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Abstract
The invention discloses a method and a system for enhancing stability of an eMMC interface, and belongs to the field of eMMC storage controllers. The method for enhancing the stability of the eMMC interface comprises the following steps: measuring initial positions of communication interfaces of the control unit under the five driving resistors respectively; adjusting the initial position of the communication interface to make the effective window of the communication interface maximum; and comparing the effective windows corresponding to the five driving resistors to obtain the driving resistor corresponding to the largest effective window, and taking the driving resistor as the driving configuration resistor of the eMMC module. According to the invention, the initial position of the communication interface of the control unit is measured under different driving resistors, the initial position of the communication interface is adjusted to maximize the effective window of the communication interface, and the optimal driving configuration resistor is found according to the maximum effective window, so that the aim of improving the stability of the eMMC interface by adopting the driving configuration resistor is fulfilled.
Description
Technical Field
The invention relates to the field of an eMMC (embedded Multi Media card) storage controller, in particular to a method and a system for enhancing the stability of an eMMC interface.
Background
The eMMC adopts a unified MMC standard interface, and encapsulates a high-density nand Flash (one of Flash memories, in which a nonlinear macro-cell mode is adopted, which provides a cheap and effective solution for realizing a solid-state large-capacity memory) memory and an MMC Controller (multimedia Controller) in a BGA (Ball Grid Array) chip. Aiming at the characteristics of Flash, the product already contains Flash management technology, including error detection and correction, Flash average erasing, bad block management, power-down protection and other technologies. One significant advantage of eMMC is the integration of a controller in the package that provides a standard interface and manages the flash memory so that the handset manufacturer can focus on other parts of the product development and shorten the time to market the product. However, as the frequency increases and PCB (Printed Circuit Board) routing and device influences, window margins of data lines and control lines of the eMMC become smaller, resulting in increasingly poor read/write stability. The traditional methods for solving the problem mainly include two methods, one is to strictly control the routing of the PCB and perform isometric processing as much as possible, but the signals transmitted on the signal lines are not isometric, so that the read-write stability cannot be fundamentally improved; the other is to carry out frequency reduction treatment on the board which is debugged, however, the board which is subjected to the frequency reduction treatment is suitable for a high-frequency working mode, and the purpose of improving the stability of reading and writing can not be achieved.
Disclosure of Invention
Aiming at the problem of poor stability of the existing eMMC interface, a method for enhancing the stability of the eMMC interface is provided.
The invention provides a method for enhancing the stability of an eMMC interface, wherein an eMMC module comprises a storage unit and a control unit, and the storage unit corresponds to five driving resistors; the method comprises the following steps:
measuring initial positions of communication interfaces of the control unit under the five driving resistors respectively;
adjusting the initial position of the communication interface to make the effective window of the communication interface maximum;
and comparing the effective windows corresponding to the five driving resistors to obtain the driving resistor corresponding to the largest effective window, and taking the driving resistor as the driving configuration resistor of the eMMC module.
Preferably, measuring the initial position of the communication interface of the control unit under a driving resistance comprises:
keeping the sampling clock signal unchanged under the driving resistor;
acquiring a sampling position of each data interface in the communication interfaces;
and the overlapped sampling positions of all the data interfaces are the initial positions of the communication interfaces.
Preferably, the acquiring a sampling position of each data interface in the communication interfaces includes:
and adjusting the receiving time of each data interface in the communication interfaces one by one to obtain the sampling position of each data interface.
Preferably, the adjusting the initial position of the communication interface to maximize the effective window of the communication interface includes:
aligning the middle positions of the sampling positions of all data interfaces in the communication interfaces;
and the overlapped sampling position of the data interface is the effective window of the communication interface.
The invention also provides a method for enhancing the stability of the eMMC interface, wherein the eMMC module comprises a storage unit and a control unit, and the storage unit corresponds to five driving resistors; the method comprises the following steps:
measuring initial positions of communication interfaces of the control unit under the five driving resistors respectively;
and comparing the initial positions corresponding to the five driving resistors to obtain the driving resistor corresponding to the maximum initial position, and taking the driving resistor as the driving configuration resistor of the eMMC module.
Preferably, measuring the initial position of the communication interface of the control unit under a driving resistance comprises:
keeping the sampling clock signal unchanged under the driving resistor;
and acquiring a sampling position of a control interface in the communication interface, wherein the sampling position of the control interface is the initial position.
The invention also provides a system for enhancing the stability of the eMMC interface, wherein the eMMC module comprises a storage unit and a control unit, and the storage unit corresponds to five driving resistors; the method comprises the following steps:
the measuring unit is used for measuring the initial position of the communication interface of the control unit under the five driving resistors respectively;
the adjusting unit is used for adjusting the initial position of the communication interface to enable the effective window of the communication interface to be maximum;
and the obtaining unit is used for comparing the effective windows corresponding to the five driving resistors to obtain the driving resistor corresponding to the largest effective window, and the driving resistor is used as the driving configuration resistor of the eMMC module.
Preferably, when the measuring unit measures the initial position of the communication interface of the control unit under one driving resistor, the measuring unit is configured to keep the sampling clock signal unchanged under the driving resistor, and obtain the sampling position of each data interface in the communication interface, where the overlapped sampling positions of all the data interfaces are the initial positions of the communication interfaces.
Preferably, the adjusting unit is configured to align middle positions of sampling positions of all data interfaces in the communication interface, where an overlapped sampling position of the data interfaces is the effective window of the communication interface.
The invention also provides a system for enhancing the stability of the eMMC interface, wherein the eMMC module comprises a storage unit and a control unit, and the storage unit corresponds to five driving resistors; the method comprises the following steps:
the measuring unit is used for measuring the initial position of the communication interface of the control unit under the five driving resistors respectively;
and the acquisition unit is used for comparing the initial positions corresponding to the five driving resistors to acquire the driving resistor corresponding to the maximum initial position, and the driving resistor is used as the driving configuration resistor of the eMMC module.
The beneficial effects of the above technical scheme are that:
in the technical scheme, the initial position of the communication interface of the control unit is measured under different driving resistors, the initial position of the communication interface is adjusted to enable the effective window of the communication interface to be maximum, and the optimal driving configuration resistor is found according to the maximum effective window, so that the aim of improving the stability of the eMMC interface by adopting the driving configuration resistor is fulfilled.
Drawings
Fig. 1 is a flowchart of an embodiment of a method for enhancing eMMC interface stability according to the present invention;
FIG. 2a is a diagram illustrating an embodiment of a sampling location of a data interface at 33 Ω according to the present invention;
FIG. 2b is a diagram illustrating an embodiment of an effective window of a communication interface at 33 Ω according to the present invention;
FIG. 3a is a schematic diagram of one embodiment of a sampling location of a data interface at 40 Ω in accordance with the present invention;
FIG. 3b is a diagram illustrating an embodiment of an effective window of a communication interface at 40 Ω according to the present invention;
FIG. 4a is a schematic diagram of one embodiment of a sampling location of a data interface at 50 Ω in accordance with the present invention;
FIG. 4b is a diagram illustrating an embodiment of an effective window of a communication interface at 50 Ω according to the present invention;
FIG. 5a is a schematic diagram of one embodiment of a sampling location of a data interface at 60 Ω in accordance with the present invention;
FIG. 5b is a diagram illustrating an embodiment of an effective window of a communication interface at 60 Ω according to the present invention;
fig. 6 is a block diagram of an embodiment of a system for enhancing stability of an eMMC interface according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
As shown in fig. 1, the present invention provides a method for enhancing stability of an eMMC interface, where an eMMC module includes a memory cell and a control unit, where the memory cell corresponds to five driving resistors; the method comprises the following steps:
s1, measuring initial positions of communication interfaces of the control unit under the five driving resistors respectively;
note that, the memory cell may adopt an eMMC cell; the control unit may employ a System-on-a-Chip (SOC) Chip.
In the present embodiment, based on the eMMC JEDEC (solid state technology association is the leading standard organization of the microelectronics industry) specification, 5 kinds of driving strengths (i.e., driving resistances: 33 Ω, 40 Ω, 50 Ω, 60 Ω, and 100 Ω, respectively) of the eMMC exist are defined, and thus the initial positions of the corresponding communication interfaces are tested with different driving strengths.
In a preferred embodiment, measuring the initial position of the communication interface of the control unit at a drive resistance comprises:
s11, keeping a sampling clock signal unchanged under the driving resistor;
s12, acquiring a sampling position of each data interface in the communication interfaces;
further, the receiving time of each data interface in the communication interfaces is adjusted one by one to obtain the sampling position of each data interface.
In actual operation, the delay values of each data interface can be adjusted to find the minimum delay value (the leftmost boundary of the data interface) and the maximum delay value (the rightmost boundary of the data interface), and the middle part is the sampling position of the data interface. Wherein the delay value is obtained according to the delay time of the unit delay multiplied by the number of delays.
Measurements may be taken in HS400 mode, HS200 mode, High Speed DDR52 mode, and High Speed SDR mode when testing the sample locations of the data interface.
It should be noted that, when testing the data interface in the HS400 mode, the DS signal (clock signal sent by the storage unit) is kept unchanged as a sampling clock signal, and the delay value of each data interface is adjusted one by one to obtain the sampling position of the data interface; when the data interfaces are tested in the HS200 mode, the High Speed DDR52 mode and the High Speed SDR mode, a CLK signal (a clock signal sent by a control unit) is kept unchanged as a sampling clock signal, and the delay value of each data interface is adjusted one by one to acquire the sampling position of the data interface.
And S13, the overlapped sampling positions of all the data interfaces are the initial positions of the communication interfaces.
S2, adjusting the initial position of the communication interface to enable the effective window of the communication interface to be maximum;
further, the adjusting the initial position of the communication interface to maximize the communication interface effective window includes:
s21, aligning the middle positions of the sampling positions of all the data interfaces in the communication interfaces;
and S22, the overlapped sampling position of the data interface is the effective window of the communication interface.
It should be noted that the number of valid windows is the overlapping area of the data lines of all the data interfaces, because if there is one signal line, there is a case of read failure.
In this embodiment, after the initial position of the communication interface is obtained, the sampling positions of all the data interfaces are aligned in a middle alignment manner, so that the effective window is maximized, and the aim of enabling the eMMC to work more stably and reliably is fulfilled.
And S3, comparing the effective windows corresponding to the five driving resistors to obtain the driving resistor corresponding to the largest effective window, and taking the driving resistor as the driving configuration resistor of the eMMC module.
In this embodiment, the initial position of the communication interface of the control unit is measured under different driving resistors, the initial position of the communication interface is adjusted to maximize the effective window of the communication interface, and an optimal driving configuration resistor is found according to the maximum effective window, so that the aim of improving the stability of the eMMC interface by using the driving configuration resistor is fulfilled.
Referring to fig. 2-5, by way of example and not limitation, when the eMMC module operates in the HS400 mode, each data interface (D0-D7) of different drive strengths (33 Ω, 40 Ω, 50 Ω, 60 Ω) is tested at 200Mhz, and then after intermediate alignment, the number of valid windows corresponding to 33 Ω is 29; the number of effective windows corresponding to 40 Ω is 27; the number of effective windows corresponding to 50 Ω is 30; the number of effective windows corresponding to 66 Ω is 29, and comparison results show that when the eMMC is at 50 Ω driving strength, the total number of effective windows is the largest, so that the 50 Ω driving strength is the driving configuration resistance of the corresponding board.
It should be noted that, the number of valid windows corresponds to the number of delays set in the internal register of the control unit, and according to the description of the SOC specification, one delay unit is delayed by 50 picoseconds (ps), and the total delay time is the number of delays multiplied by 50 ps. The effective window number is the area where eight data lines of the data interface (D0-D7) overlap, because if one signal line is not present, there is a case of read failure.
The invention also provides a method for enhancing the stability of the eMMC interface, wherein the eMMC module comprises a storage unit and a control unit, and the storage unit corresponds to five driving resistors; the method comprises the following steps:
A1. measuring initial positions of communication interfaces of the control unit under the five driving resistors respectively;
A2. and comparing the initial positions corresponding to the five driving resistors to obtain the driving resistor corresponding to the maximum initial position, and taking the driving resistor as the driving configuration resistor of the eMMC module.
In the embodiment, the initial position of the communication interface of the control unit is measured under different driving resistors, and the optimal driving configuration resistor is found according to the maximum initial position, so that the aim of improving the stability of the eMMC interface by adopting the driving configuration resistor is fulfilled.
In a preferred embodiment, measuring the initial position of the communication interface of the control unit at a drive resistance comprises:
keeping the sampling clock signal unchanged under the driving resistor;
and acquiring a sampling position of a control interface in the communication interface, wherein the sampling position of the control interface is the initial position.
Measurements may be taken in HS400 mode, HS200 mode, High Speed DDR52 mode, and High Speed SDR mode when testing the sample locations of the control interface.
When the control interface is tested in the HS400 mode, the HS200 mode, the High Speed DDR52 mode, and the High Speed SDR mode, the sampling position of the control interface is measured while the CLK signal (clock signal transmitted from the control unit) is kept as the sampling clock signal.
As shown in fig. 6, the present invention further provides a system for enhancing stability of an eMMC interface, where an eMMC module includes a memory cell and a control unit, and the memory cell corresponds to five driving resistors; the method comprises the following steps:
the measuring unit 1 is used for measuring the initial position of the communication interface of the control unit under the five driving resistors respectively;
the adjusting unit 2 is used for adjusting the initial position of the communication interface to enable the effective window of the communication interface to be maximum;
and the obtaining unit 3 is configured to compare the effective windows corresponding to the five driving resistors, obtain a driving resistor corresponding to a largest effective window, and use the driving resistor as a driving configuration resistor of the eMMC module.
In the technical scheme, the initial position of the communication interface of the control unit is measured under different driving resistors, the initial position of the communication interface is adjusted to enable the effective window of the communication interface to be maximum, and the optimal driving configuration resistor is found according to the maximum effective window, so that the aim of improving the stability of the eMMC interface by adopting the driving configuration resistor is fulfilled.
In a preferred embodiment, when the measuring unit 1 measures the initial position of the communication interface of the control unit under one driving resistor, the measuring unit is configured to keep the sampling clock signal unchanged under the driving resistor, and obtain the sampling position of each data interface in the communication interface, where the overlapped sampling positions of all the data interfaces are the initial positions of the communication interfaces.
In a preferred embodiment, the adjusting unit 2 is configured to align the middle positions of the sampling positions of all the data interfaces in the communication interface, where the overlapping sampling positions of the data interfaces are the valid windows of the communication interfaces.
The invention also provides a system for enhancing the stability of the eMMC interface, wherein the eMMC module comprises a storage unit and a control unit, and the storage unit corresponds to five driving resistors; the method comprises the following steps:
the measuring unit is used for measuring the initial position of the communication interface of the control unit under the five driving resistors respectively;
and the acquisition unit is used for comparing the initial positions corresponding to the five driving resistors to acquire the driving resistor corresponding to the maximum initial position, and the driving resistor is used as the driving configuration resistor of the eMMC module.
In the embodiment, the initial position of the communication interface of the control unit is measured under different driving resistors, and the optimal driving configuration resistor is found according to the maximum initial position, so that the aim of improving the stability of the eMMC interface by adopting the driving configuration resistor is fulfilled.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. A method for enhancing stability of an eMMC interface is provided, wherein an eMMC module comprises a storage unit and a control unit, and the storage unit corresponds to five driving resistors; characterized in that the method comprises the following steps:
measuring initial positions of communication interfaces of the control unit under the five driving resistors respectively;
adjusting the initial position of the communication interface to make the effective window of the communication interface maximum;
comparing the effective windows corresponding to the five driving resistors to obtain a driving resistor corresponding to the largest effective window, and using the driving resistor as a driving configuration resistor of the eMMC module;
measuring an initial position of a communication interface of the control unit at a drive resistance, comprising:
keeping the sampling clock signal unchanged under the driving resistor;
acquiring a sampling position of each data interface in the communication interfaces;
and the overlapped sampling positions of all the data interfaces are the initial positions of the communication interfaces.
2. The method of enhancing eMMC interface stability of claim 1, wherein the obtaining a sampling location for each data interface of the communication interfaces comprises:
and adjusting the receiving time of each data interface in the communication interfaces one by one to obtain the sampling position of each data interface.
3. The method of enhancing eMMC interface stability of claim 1, wherein the adjusting the initial position of the communication interface to maximize the communication interface validity window comprises:
aligning the middle positions of the sampling positions of all data interfaces in the communication interfaces;
and the overlapped sampling position of the data interface is the effective window of the communication interface.
4. A method for enhancing stability of an eMMC interface is provided, wherein an eMMC module comprises a storage unit and a control unit, and the storage unit corresponds to five driving resistors; characterized in that the method comprises the following steps:
measuring initial positions of communication interfaces of the control unit under the five driving resistors respectively;
comparing the initial positions corresponding to the five driving resistors to obtain a driving resistor corresponding to the maximum initial position, and taking the driving resistor as a driving configuration resistor of the eMMC module;
measuring an initial position of a communication interface of the control unit at a drive resistance, comprising:
keeping the sampling clock signal unchanged under the driving resistor;
and acquiring a sampling position of a control interface in the communication interface, wherein the sampling position of the control interface is the initial position.
5. A system for enhancing stability of an eMMC interface is provided, wherein an eMMC module comprises a storage unit and a control unit, and the storage unit corresponds to five driving resistors; it is characterized by comprising:
the measuring unit is used for measuring the initial position of the communication interface of the control unit under the five driving resistors respectively;
the adjusting unit is used for adjusting the initial position of the communication interface to enable the effective window of the communication interface to be maximum;
an obtaining unit, configured to compare the effective windows corresponding to the five driving resistors, obtain a driving resistor corresponding to a largest effective window, and use the driving resistor as a driving configuration resistor of the eMMC module;
the measurement unit is used for keeping a sampling clock signal unchanged under a driving resistor when measuring the initial position of a communication interface of the control unit under the driving resistor, and acquiring the sampling position of each data interface in the communication interface, wherein the overlapped sampling positions of all the data interfaces are the initial positions of the communication interfaces.
6. The system for enhancing eMMC interface stability of claim 5, wherein the adjustment unit is configured to align a middle position of sampling positions of all data interfaces in the communication interface, and a sampling position where the data interfaces overlap is the communication interface valid window.
7. A system for enhancing stability of an eMMC interface is provided, wherein an eMMC module comprises a storage unit and a control unit, and the storage unit corresponds to five driving resistors; it is characterized by comprising:
the measuring unit is used for measuring the initial position of the communication interface of the control unit under the five driving resistors respectively;
an obtaining unit, configured to compare the initial positions corresponding to the five driving resistors, obtain a driving resistor corresponding to a maximum initial position, and use the driving resistor as a driving configuration resistor of the eMMC module;
measuring an initial position of a communication interface of the control unit at a drive resistance, comprising:
keeping the sampling clock signal unchanged under the driving resistor;
and acquiring a sampling position of a control interface in the communication interface, wherein the sampling position of the control interface is the initial position.
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