US5691948A
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Memory apparatus
Assignee: Fujitsu Ltd
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Filing: 1996-12-05
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Granted: 1997-11-25
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Expires: 2016-12-05
Abstract
Abstract A measuring unit measures a time (T) of a command interval by setting the end of a command generated from an upper apparatus to a start timing or by setting the start of the reception of the next command to a stop timing. A timing deciding unit varies a plurality of timings to perform a power saving on the basis of the measurement time of the command interval which was measured by the measuring unit. A power save control unit controls the apparatus to a power saving mode for a time interval from the timing decided by the timing deciding after the end of the execution of the command received from said upper apparatus until a timing when a next command is obtained.
Inventors
- 👤 Tetsuya Sakabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:39
CPC Classifications
G; G11; G11B; G11B19/00; G11B19/02; G11B19/06; G11B19/20; G11C; G11C5/00; G11C5/14; G11C7/00; G11C7/22
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
117 words
A memory apparatus comprising: measuring means for measuring a time of a command interval from a timing when an execution of a command generated from an upper apparatus is finished to a timing when a next command is received; timing deciding means for varying a timing to perform a power saving on the basis of the measurement time of the command interval measured by said measuring means; and power save control means for controlling the apparatus to a power saving mode for a time interval from the timing decided by said timing deciding means after the end of the execution of the command received from said upper apparatus until a timing when a next command is obtained.
Claim 2
Dependent Claim
117 words
A memory apparatus comprising: measuring means for measuring a time of a command interval from a timing when an execution of a command generated from an upper apparatus is finished to a timing when a next command is received; timing deciding means for varying a timing to perform a power saving on the basis of the measurement time of the command interval measured by said measuring means; and power save control means for controlling the apparatus to a power saving mode for a time interval from the timing decided by said timing deciding means after the end of the execution of the command received from said upper apparatus until a timing when a next command is obtained.
Claim 3
Dependent Claim
48 words
An apparatus according to claim 1, wherein said measuring means measures times of a plurality of command intervals generated from the upper apparatus and obtains a mean value, and said timing deciding means decides the timing to perform the power saving on the basis of said mean value.
Claim 4
Dependent Claim
49 words
An apparatus according to claim 1, wherein for an increase in time of the command interval, said timing deciding means decides the timings for performing the power saving in accordance with the order of circuit units in which return times at the time of a power-on start are short.
Claim 5
Dependent Claim
55 words
An apparatus according to claim 3, wherein for an increase in time of the command interval, said timing deciding means decides the timings for performing the power saving in accordance with the order of at least a read/write circuit unit, a circuit unit to drive a head, and a circuit unit to rotate a medium.
Claim 6
Dependent Claim
62 words
An apparatus according to claim 3, wherein for an increase in time of the command interval, said timing deciding means decides the timings for performing the power saving in accordance with the order of at least a read/write circuit unit, a clock generating circuit of a processor, a circuit unit to drive a head, and a circuit unit to rotate a medium.
Claim 7
Dependent Claim
70 words
An apparatus according to claim 3, wherein for an increase in time of the command interval, said timing deciding means decides the timings for performing the power saving in accordance with the order of at least a read/write circuit unit, a clock generating circuit of a processor, a circuit unit to drive a head, a circuit unit to rotate a medium, and a circuit unit to drive a cooling fan.
Claim 8
Dependent Claim
59 words
An apparatus according to claim 3, wherein in the case where the measurement time of the command interval exceeds a predetermined maximum time, said timing deciding means decides the timing by allowing only circuit units which can recognize the command reception from the upper apparatus to be left and setting other circuit units to targets of the power saving.
Claim 9
Dependent Claim
66 words
An apparatus according to claim 1, wherein the measurement time of the command interval is stored into a non-volatile memory or a memory medium and said timing deciding means decides the timing for performing the power saving by using the measurement time of the command interval stored in said non-volatile memory or said disk medium by a power-on start after a power source was turned off.
Claim 10
Dependent Claim
35 words
An apparatus according to claim 8, wherein the measurement time of the command interval stored in said non-volatile memory or said memory medium is updated each time the measurement is executed by said measuring means.
Claim 11
Dependent Claim
121 words
A memory apparatus comprising: measuring means for measuring a time of a command interval from a timing when an execution of a command generated from an upper apparatus is finished to a timing when a next command is received; deciding means for deciding one or a plurality of circuit units to be subjected to a power saving in accordance with the measurement time of the command interval by said measuring means; and power save control means for controlling the apparatus to a power saving mode for a time interval from the timing decided by said timing deciding means after the end of the execution of the command received from said upper apparatus until a timing when a next command is obtained.
Claim 12
Dependent Claim
121 words
A memory apparatus comprising: measuring means for measuring a time of a command interval from a timing when an execution of a command generated from an upper apparatus is finished to a timing when a next command is received; deciding means for deciding one or a plurality of circuit units to be subjected to a power saving in accordance with the measurement time of the command interval by said measuring means; and power save control means for controlling the apparatus to a power saving mode for a time interval from the timing decided by said timing deciding means after the end of the execution of the command received from said upper apparatus until a timing when a next command is obtained.
Claim 13
Dependent Claim
28 words
An apparatus according to claim 10, wherein said measuring means measures time intervals of a plurality of commands generated from the upper apparatus and obtains a mean value.
Claim 14
Dependent Claim
54 words
An apparatus according to claim 10, wherein for an increase in the measurement time of the command interval, said deciding means increases the number of circuit units for performing the power saving in accordance with the order of the circuit units in which return times at the time of a power-on start are short.
Claim 15
Dependent Claim
59 words
An apparatus according to claim 12, wherein for an increase in the measurement time of the command interval, said deciding means increases the number of circuit units for performing the power saving in accordance with the order of at least a read/write circuit unit, a circuit unit to drive a head, and a circuit unit to rotate a medium.
Claim 16
Dependent Claim
66 words
An apparatus according to claim 12, wherein for an increase in the measurement time of the command interval, said deciding means increases the number of circuit units for performing the power saving in accordance with the order of at least a read/write circuit unit, a clock generating circuit of a processor, a circuit unit to drive a head, and a circuit unit to rotate a medium.
Claim 17
Dependent Claim
74 words
An apparatus according to claim 12, wherein for an increase in the measurement time of the command interval, said deciding means increases the number of circuit units for performing the power saving in accordance with the order of at least a read/write circuit unit, a clock generating circuit of a processor, a circuit unit to drive a head, a circuit unit to rotate a medium, and a circuit unit to drive a cooling fan.
Claim 18
Dependent Claim
58 words
An apparatus according to claim 12, wherein in the case where the measurement time of the command interval exceeds a predetermined maximum time, said deciding means allows only the circuit units which can recognize the command reception from the upper apparatus to be left and sets all of the other circuit units to targets of the power saving.
Claim 19
Dependent Claim
70 words
An apparatus according to claim 10, wherein said measuring means stores the measurement time of the command interval into a non-volatile memory or a memory medium, and said deciding means decides one or a plurality of circuit units to be subjected to the power saving by using the measurement time stored in said non-volatile memory or said memory medium by a power-on start after a power source was turned off.
Claim 20
Dependent Claim
35 words
An apparatus according to claim 17, wherein the measurement time of the command interval stored in said non-volatile memory or said memory medium is updated each time the measurement is executed by said measuring means.
References Cited (Backward Citations)
JPS6314369A
Cited
JPS63255868A
Cited
JPH02306483A
Cited
JPH04123359A
Cited
JPH04221458A
Cited
US5430881A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-24 | 2001-05-26 | 2001-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-24 | 2005-05-26 | 2005-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-24 | 2009-05-26 | 2009-11-25 | $7700.00 | Window Closed / Lapsed |