Efficient memory controller with an independent clock
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United States of America Patent
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Aug 24, 1993
Grant Date -
N/A
app pub date -
Nov 9, 1990
filing date -
Nov 9, 1990
priority date (Note) -
Expired
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Abstract
A means and a method of interfacing a memory controller with a high speed synchronous CPU wherein the CPU clock is independent of the memory controller clock. The CPU clock is connected to both the CPU and a control interface state tracker located externally to the memory controller. The control interface state tracker is then connected to the memory controller. A separate clock independent from the one used with the CPU is coupled to the memory controller and drives the operation of the memory controller. During the operation of the computer system, the CPU makes read or write cycle requests of the memory controller. Such cycles are initiated when the CPU sends a cycle 'start' indicator to the state tracker. In response, the state tracker activates a start strobe to the memory controller to start the actual memory cycle. The memory controller receives the CPU address and cycle status and determines the page hit/miss condition of the memory access. Using this information, the appropriate register in the cycle length register file is accessed to obtain a cycle length feedback value indicating the quantity of wait states necessary for the particular memory cycle. This cycle length feedback value is sent to the external control interface state tracker. The state tracker then returns a ready indication to the CPU after the cycle length time has been satisfied as indicated by the cycle length feedback.
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Patent Owner(s)
Patent Owner | Address | |
---|---|---|
INTEL CORPORATION A CORP OF DE | 2200 MISSION COLLEGE BLVD SANTA CLARA CA 95052-8119 |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Carmel, Erez | Sacramento, CA | 5 | 185 |
Fischer, Stephen A | Sacramento, CA | 97 | 1630 |
Heil, Thomas F | Easley, SC | 61 | 1752 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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