FMR CORP
SC 13D/A, 1997-10-14
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SCHEDULE 13D 
 
Amendment No. 3 
Quickturn Design Systems, Incorporated 
Common Stock  
Cusip # 74838E102 
 
 
 
Cusip # 74838E102 
Item 1:	Reporting Persons - FMR Corp. and Fidelity Investors  
Management Corp. 
Item 4:	N/A 
Item 6:	Commonwealth of Massachusetts 
Item 7:	796,142 
Item 8:	None 
Item 9:	821,142 
Item 10:	None 
Item 11:	821,142 
Item 13:	4.71% 
Item 14:	HC 
 
 
Cusip # 74838E102 
Item 1:	Reporting Person - FMR Corp. - (Tax ID:  04-2507163) 
Item 4:	PF 
Item 6:	Commonwealth of Massachusetts 
Item 7:	None 
Item 8:	None 
Item 9:	25,000 
Item 10:	None 
Item 11:	25,000 
Item 13:	0.14% 
Item 14:	HC 
 
 
Cusip # 74838E102 
Item 1:	Reporting Person - Fidelity Investors Management Corp. 
Item 4:	PF 
Item 6:	State of Delaware 
Item 7:	796,142 
Item 8:	None 
Item 9:	796,142 
Item 10:	None 
Item 11:	796,142 
Item 13:	4.57% 
Item 14:	CO 
 
 
 
PREAMBLE 
 
	The filing of this Schedule 13D is not, and should not be  
deemed to be, an admission that such Schedule 13D is required to  
be filed.  See the discussion under Item 2. 
 
Item 1.	Security and Issuer. 
 
	This statement relates to shares of the Common Stock, $0.01  
par value (the "Shares") of Quickturn Design Systems,  
Incorporated, a Delaware corporation (the "Company").  The  
principal executive offices of the Company are located at 440  
Clyde Avenue, Mountain View, CA  94043. 
 
Item 2.	Identity and Background. 
 
	This statement is being filed by Fidelity Investors Limited  
Partnership ("FILP"), Fidelity Investors Management Corp.  
("FIMC") and FMR Corp. ("FMR", collectively the "Reporting  
Persons"). 
 
	FILP is a Delaware limited partnership organized for the  
purpose of making venture capital investments.  FIMC, a Delaware  
corporation, is the general partner of FILP and its investment  
manager and is registered under Section 203 of the Investment  
Advisors Act of 1940.  The principal offices of FILP and FIMC are  
located at 82 Devonshire Street, Boston, Massachusetts, 02109.   
The name, residence or business address, principal occupation or  
employment and citizenship of each of the executive officers and  
directors of FIMC are set forth on Schedule A hereto. 
 
	Members of the Edward C. Johnson 3d family are the  
predominant owners of the voting stock of FIMC, representing  
approximately 89% of the voting power of FIMC.  Mr. Johnson 3d  
holds 39.4% of the outstanding voting stock of FIMP.  Mr. Johnson  
3d is also Chairman of FIMC.  FIMC has all of the voting power of  
FILP.  Accordingly, Mr. Johnson 3d and members of the Johnson  
family may be deemed, to form a controlling group with respect to  
FILP.  The business address and principal occupation of Mr.  
Johnson 3d is set forth on set forth on Schedule A hereto. 
 
	FMR is a holding company, organized as a Massachusetts  
corporation, one of whose principal assets is the capital stock  
of a wholly-owned subsidiary, Fidelity Management & Research  
Company ("Fidelity"), which is also a Massachusetts corporation.   
Fidelity is an investment advisor which is registered under  
Section 203 of the Investment Advisors Act of 1940 and which  
provides investment advisory services to more than 30 investment  
companies which are registered under Section 8 of the Investment  
Company Act of 1940 and serves as investment advisor to certain  
other funds which are generally offered to limited groups of  
investors (the "Fidelity Funds").  Various directly or indirectly  
held subsidiaries of FMR are also engaged in investment  
management, venture capital asset management, securities  
brokerage, transfer and shareholder servicing and real estate  
development.  The principal offices of FMR and Fidelity are  
located at 82 Devonshire Street, Boston, Massachusetts 02109. 
 
	Members of the Edward C. Johnson 3d family are the  
predominant owners of Class B shares of common stock of FMR  
representing approximately 49% of the voting power of FMR.  Mr.  
Johnson 3d owns 12.0% and Abigail Johnson owns 24.5% of the  
aggregate outstanding voting stock of FMR.  Mr. Johnson 3d is the  
Chairman of FMR.  The Johnson family group and all other Class B  
shareholders have entered into a shareholders' voting agreement  
under which all Class B shares will be voted in accordance with  
the majority vote of Class B shares.  Accordingly, through their  
ownership of voting common stock and the execution of the  
shareholders' voting agreement, members of the Johnson family may  
be deemed, under the Investment Company Act of 1940, to form a  
controlling group with respect to FMR.  The business address and  
principal occupation of Mr. Johnson 3d is set forth in Schedule  
A1 hereto.  
 
	The Shares to which this statement relates are owned  
directly by two of the Fidelity Funds and FILP. 
 
	Within the past five years, none of the persons named in  
this Item 2 or listed on Schedule A has been convicted in any  
criminal proceeding (excluding traffic violations or similar  
misdemeanors) or has been a party to any civil proceeding and as  
a result thereof was or is subject to any judgment, decree or  
final order enjoining future violations of, or prohibiting or  
mandating activities subject to federal or state securities laws  
or finding any violations with respect to such laws. 
 
Item 3.	Source and Amount of Funds or Other Consideration. 
 
	FILP purchased in the aggregate 1,500,000 shares of the  
SpeedSim Inc. Series A Convertible Preferred Stock (the  
"Preferred Stock") for cash in the amount of approximately  
$1,500,000, including brokerage commissions.  FILP used its own  
assets in making such purchase and no part of the purchase price  
is represented by borrowed funds.  The Preferred Stock was  
converted into 796,142 Shares of the Company's common stock on  
February 7, 1997, in conjunction with the Company's acquisition  
of SpeedSim Inc. 
 
	The Fidelity Funds which own or owned Shares purchased in  
the aggregate 1,178,100 Shares for cash in the amount of  
approximately $21,148,469, including brokerage commissions.  The  
Fidelity Funds used their own assets in making such purchase and  
no part of the purchase price is represented by borrowed funds.   
Proceeds from 1,178,100 Shares sold aggregated approximately  
$17,616,672.  The attached Schedule B sets forth Shares purchased  
and/or sold since August 8, 1997. 
 
	 
Item 4.	Purpose of Transaction. 
 
	The purpose of FIMC in having FILP purchase Shares (see  
Item 5 below) is to acquire an equity interest in the Company in  
pursuit of specified investment objectives established by FILP. 
 
	FIMC may continue to have FILP purchase Shares subject to  
a number of factors, including, among others, the availability of  
Shares of sale at what FIMC considers to be reasonable prices and  
other investment opportunities that may be available to FILP. 
 
	FIMC intends to review continuously the equity position of  
FILP in the Company.  Depending upon future evaluations of the  
business prospects of the Company and upon other developments,  
including, but not limited to, general economic and business  
conditions and money market and stock market conditions, FIMC may  
determine to cease making additional purchases of Shares or to  
increase or decrease the equity interest in the Company by  
acquiring additional Shares, or by disposing of all or a portion  
of the Shares. 
 
	Neither FILP nor FIMC has any present plan or proposal  
which relates to or would result in (i) an extraordinary  
corporate transaction, such as a merger, reorganization,  
liquidation, or sale of transfer of a material amount of assets  
involving the Company or any of its subsidiaries, (ii) any change  
in the Company's present Board of Directors or management, (iii)  
any material changes in the Company's present capitalization or  
dividend policy or any other material change in the Company's  
business or corporate structure, (iv) any change in the Company's  
charter or by-laws, or (v) the Company's common stock becoming  
eligible for termination of its registration pursuant to Section  
12(g)(4) of the 1934 Act. 
 
	The purpose of Fidelity in having the Fidelity Funds and the  
Accounts purchase Shares is to acquire an equity interest in the  
Company in pursuit of specified investment objectives established  
by the Board of Trustees of the Fidelity Funds and by the  
investors in the Accounts. 
 
	Fidelity may continue to have the Fidelity Funds and the  
Accounts purchase Shares subject to a number of factors,  
including, among others, the availability of Shares of sale at  
what they consider to be reasonable prices and other investment  
opportunities that may be available to the Fidelity Funds and  
Accounts. 
 
	Fidelity intends to review continuously the equity position  
of the Fidelity Funds and Accounts in the Company.  Depending  
upon future evaluations of the business prospects of the Company  
and upon other developments, including, but not limited to,  
general economic and business conditions and money market and  
stock market conditions, Fidelity may determine to cease making  
additional purchases of Shares or to increase or decrease the  
equity interest in the Company by acquiring additional Shares, or  
by disposing of all or a portion of the Shares. 
 
	Fidelity has no present plan or proposal which relates to or  
would result in (i) an extraordinary corporate transaction, such  
as a merger, reorganization, liquidation, or sale of transfer of  
a material amount of assets involving the Company or any of its  
subsidiaries, (ii) any change in the Company's present Board of  
Directors or management, (iii) any material changes in the  
Company's present capitalization or dividend policy or any other  
material change in the Company's business or corporate structure,  
(iv) any change in the Company's charter or by-laws, or (v) the  
Company's common stock becoming eligible for termination of its  
registration pursuant to Section 12(g)(4) of the 1934 Act. 
 
Item 5.	Interest in Securities of Issuer. 
 
	The Reporting Persons, beneficially own all 1,093,642  
Shares. 
 
	(a)	FILP owns 796,142 Shares, or approximately 4.57% of the  
outstanding Shares of the Company.  Neither FIMC nor any of its  
affiliates, nor, to the best knowledge of FIMC, any members of  
the Johnson family or persons named on Schedule A hereto,  
beneficially owns any other Shares.  FMR beneficially owns,  
through Fidelity, as investment advisor to the Fidelity Funds,  
25,000 Shares, or approximately 0.14% of the outstanding Shares  
of the Company.  Neither FMR, Fidelity, nor any of its affiliates  
nor, to the best knowledge of FMR, any of the persons named in  
Schedule A1 hereto, beneficially owns any other Shares.  The  
combined holdings of FMR,  Fidelity, and FILP are 821,142 Shares,  
or approximately 4.71% of the outstanding Shares of the Company. 
 
	(b)	As FILP's general partner and investment adviser, FIMC  
has sole voting and dispositive power over the 796,142 Shares  
held by FILP.  FMR, through its control of Fidelity, investment  
advisor to the Fidelity Funds, has sole power to dispose of the  
Shares held by the Fidelity Funds.  Neither FMR nor Mr. Johnson  
has the sole power to vote or direct the voting of the 25,000  
Shares owned directly by the Fidelity Funds, which power resides  
with the Funds' Boards of Trustees.  Fidelity carries out the  
voting of the Shares under written guidelines established by the  
Funds' Board of Trustees.   
 
	(c)	Neither FILP, FIMC, nor any of their affiliates, nor,  
to the best knowledge of FIMC, any members of the Johnson family  
or other persons named on Schedule A hereto, has effected any  
transaction in Shares during the past sixty (60) days.  Except as  
set forth in Schedule B, neither FMR, or any of its affiliates,  
nor, to the best knowledge of FMR, any of the persons named in  
Schedule A1 hereto has effected any transaction in Shares during  
the past sixty (60) days. 
 
Item 6.	Contract, Arrangements, Understandings or Relationships  
With Respect to Securities of the Issuer. 
 
	Neither FILP, FIMC nor any of their affiliates, nor, to  
the best knowledge of FIMC, any members of the Johnson family or  
other persons named on Schedule A hereto, has any joint venture,  
finder's fee, or other contract or arrangement with any person  
with respect to any securities of the Company. 
 
	Inasmuch as FMR, FILP, FIMC are no longer the beneficial  
owner of more than 5% of the number of shares outstanding, FMR,  
FILP, FIMC have no further reporting obligation under Section  
13(d) of the Securities Exchange Act of 1934 or the rules and  
regulations promulgated by the Securities and Exchange Commission  
thereunder.  This statement speaks as of its date, and no  
inference should be drawn that no change has occurred in the  
facts set forth herein after the date hereof. 
 
	Neither FMR nor any of its affiliates nor, to the best  
knowledge of FMR, any of the persons named in Schedule A hereto  
has any joint venture, finder's fee, or other contract or  
arrangement with any person with respect to any securities of the  
Company. 
 
 
 
Item 7.	Material to be Filed as Exhibits. 
 
	Attached Schedule C - Joint Filing Agreement. 
 
	This statement speaks as of its date, and no inference  
should be drawn that no change has occurred in the facts set  
forth herein after the date hereof. 
 
Signature 
 
	After reasonable inquiry and to the best of my knowledge and  
belief, I certify that the information set forth in this  
statement is true, complete and correct. 
 
DATE:	October 13, 1997 
						FMR Corp. 
 
 
						By:	/s/Arthur Loring			 
						Arthur Loring 
						Vice President-Legal 
 
 
						Fidelity Investors Limited  
Partnership 
						By: Fidelity Investors Management  
						Corp., its General Partner 
 
 
						By:					 
						Name: John J. Remondi  
						Title: President 
 
 
						Fidelity Investors Management Corp. 
 
 
						By:					 
						Name: John J. Remondi 
						Title: President 
 
 
 
SCHEDULE A 
 
	The name and present principal occupation or employment of  
each executive officer and director of FIMC. are set forth below.   
The business address of each person is 82 Devonshire Street,  
Boston, Massachusetts 02109, and the address of the corporation  
or organization in which such employment is conducted is the same  
as his business address.  All of the persons listed below are  
U.S. citizens. 
 
POSITION WITH 
									PRINCIPAL 
NAME	FIMC	OCCUPATION 
 
Edward C. Johnson 3d	Director,	Chairman  
of the Board 
Chairman of the Board	and CEO, FMR Corp. 
 
John J. Remondi	Director and President	Sr. VP Fidelity  
Capital  
		and Director  
Fidelity 
		Ventures 
 
Donald E. Alhart	Director, Vice President	VP Crosby Advisors 
	and Assistant Secretary 
 
David C. Weinstein	Vice President	Sr. Vice President 
	Administration,  
	FMR Corp. 
 
Gerald M. Lieberman	Vice President	Sr. Vice Pres. - 
	Chief Financial  
	Officer, FMR Corp. 
 
 
 
 
SCHEDULE A 
 
	The name and present principal occupation or employment of  
each executive officer and director of FMR Corp. are set forth  
below.  The business address of each person is 82 Devonshire  
Street, Boston, Massachusetts 02109, and the address of the  
corporation or organization in which such employment is conducted  
is the same as his business address.  All of the persons listed  
below are U.S. citizens. 
 
POSITION WITH 
									PRINCIPAL 
NAME	FMR CORP.	OCCUPATION 
 
Edward C. Johnson 3d	President, 
	Chairman of the 
Director, CEO	Board and CEO, FMR  
Corp. 
Chairman & 
Mng. Director 
 
J. Gary Burkhead	Director and Vice Chairman	President,  
Fidelity Investments 
		Institutional  
Services  
		Company, Inc. 
 
James C. Curvey	Director, Vice Chairman,	Chief Operating  
Officer, FMR 
	Chief Operating Officer 
 
William L. Byrnes	Director & Mng.	Vice Chairman, FIL 
Director 
 
Abigail P. Johnson	Director	Associate Director  
and Senior Vice 		President - Fidelity  
Management & 		Research Company 
 
George A. Vanderheiden	Director	Senior  
Vice President, 
		Fidelity Management  
& Research 			Company 
 
David C. Weinstein	Sr. Vice President	Sr. Vice President 
Administration	Administration, FMR  
Corp. 
 
 
Mark A. Peterson	Executive Vice President	President - Fidelity  
Investments 			Technology &  
Processing Group 
 
Gerald M. Lieberman	Sr. Vice Pres. - 	Sr. Vice Pres. - 
Chief Financial	Chief Financial  
Officer	Officer, FMR Corp. 
 
 
SCHEDULE B 
 
 
Quickturn Design Systems, Incorporated 
 
Two Fidelity Fund(s) sold Shares since August 8, 1997 at the  
dates and at the prices set forth below.  The transactions were  
made for cash in open market transactions or with other  
investment companies with the same or an affiliated investment  
advisor. 
 
	DATE	SHARES	PRICE 
 
	09/26/97	20,000	$15.00 
	09/30/97	2,500	15.00 
	10/06/97	45,000	15.03 
	10/07/97	80,000	15.09 
	10/08/97	60,000	15.42 
 
 
 
 
 
 
Exhibit C 
 
JOINT FILING AGREEMENT 
 
 
	This will confirm the agreement by FMR Corp., a  
Massachusetts corporation, Fidelity Investors Limited  
Partnership, a Delaware limited partnership, and Fidelity  
Investors Management Corp., a Delaware corporation (collectively,  
the "Reporting Persons") in connection with that certain Schedule  
13D to be filed on or about March 3, 1997, with respect to the  
common stock, par value $.01 per share (the "Common Stock"), of  
Quickturn Design Systems, Inc. (the "Company") pertaining to the  
beneficial ownership by the Reporting Persons of shares of such  
common stock (the "Schedule 13D").  The undersigned hereby agree  
with respect to such filing on Schedule 13D as follows: 
 
	(i)	No Reporting Person nor any affiliate of any Reporting  
Person makes any representation with respect to, nor bears any  
responsibility for, any of the information set forth with respect  
to any other "person" who or which is or becomes a party to or a  
member of any "group" (as such terms are defined and used in  
Section 13(d) of the Securities Exchange Act of 1934, as amended,  
and Regulation 13D-G promulgated thereunder) for whom or which  
information is included in such Schedule 13D. 
 
	(ii)	Subject to paragraph (i) above, the undersigned hereby  
confirm the agreement by and among each of them that the Schedule  
13D is being filed on behalf of each of the parties named below. 
 
	This Agreement may be executed in two or more counterparts,  
each of which shall be deemed an original, but all of which  
together shall constitute one and the same instrument. 
 
 
Dated: March 3, 1997 
								FMR Corp. 
 
 
								By:	/s/ Arthur S. Loring 
		 
								Name: Arthur S. Loring 
								Title: Vice President -  
Legal 
 
								Fidelity Investors  
Limited Partnership 
								By: Fidelity Investors  
Management  
								Corp., its General  
Partner 
 
 
								By:	/s/ John J. Remondi	 
	 
								Name: John J. Remondi 
								Title: President 
 
 
								Fidelity Investors  
Management Corp. 
 
 
								By: 	/s/ John J. Remondi	 
	 
								Name: John J. Remondi 
								Title: President 


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