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Re: Calling on logic equation gurus [message #848 is a reply to message #847]

Fri, 24 June 2016 11:14

yoda
Messages: 125
Registered: October 2015
Location: Cedar Rapids, IA

Senior Member

I am talking about 1st and 3rd term of CS. When I code this in Quartus II, I get a warning that CLK is never used as an input. I coded CLKD as a wire so maybe it is being smart and optimizing and essentially saying I am using both levels of CLK so therefore it is not necessary. I agree the 2nd TERM is unique and /AS is required to address the coprocessor so I am not sure what the other 2 terms are going to yield. Section 10.3 of the MC68881/2 user manual is the relevant section that concerns me. It would seem this logic is trying to do something to make an early chip select which I don't think it does. It seems the late chip select is what is needed and only needs to be conditioned by /AS. It states on page 10-8:

A late chip select design can use slower (and, therefore, less expensive) logic. To implement this design, the CS generation logic should be conditioned by AS to ensure that the CS transition does not coincide with the AS transition. Another consideration in using slower logic is that if a non- FPCP access follows an FPCP access, the CS for the FPCP must not remain asserted inadvertently during the non-FPCP access. However, AS should be included in the decode logic as shown in Figure 10-5(A), along with the timing that the logic provides. When AS is used in an AND gate with the decode logic output as shown Figure 10-5( Cool

, CS is asserted after the start of the non- FPCP access, as the timing diagram shows. This implementation in Figure 10-5( Cool

is incorrect.

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[Message index]

		Gryphon 68030 By: lynchaj on Wed, 08 June 2016 13:57
		Re: Gryphon 68030 By: lynchaj on Wed, 08 June 2016 13:58
		Re: Gryphon 68030 By: computerdoc on Thu, 09 June 2016 01:43
		Re: Gryphon 68030 By: lynchaj on Fri, 10 June 2016 03:16
		Re: Gryphon 68030 By: computerdoc on Fri, 10 June 2016 08:56
		Re: Gryphon 68030 By: lynchaj on Fri, 10 June 2016 09:16
		Re: Gryphon 68030 By: yoda on Fri, 10 June 2016 10:46
		Re: Gryphon 68030 By: lynchaj on Fri, 10 June 2016 11:43
		Re: Gryphon 68030 By: yoda on Fri, 10 June 2016 11:49
		Re: Gryphon 68030 By: lynchaj on Fri, 10 June 2016 12:10
		Re: Gryphon 68030 By: yoda on Fri, 10 June 2016 12:24
		Re: Gryphon 68030 By: jcoffman on Fri, 10 June 2016 15:06
		Re: Gryphon 68030 By: will on Sat, 11 June 2016 03:29
		Re: Gryphon 68030 By: yoda on Sat, 11 June 2016 10:43
		Re: Gryphon 68030 By: lynchaj on Sun, 12 June 2016 04:15
		Re: Gryphon 68030 By: yoda on Sun, 12 June 2016 06:36
		Re: Gryphon 68030 By: lynchaj on Sun, 12 June 2016 07:03
		Re: Gryphon 68030 By: lynchaj on Sun, 12 June 2016 07:13
		Re: Gryphon 68030 By: yoda on Sun, 12 June 2016 08:07
		Re: Gryphon 68030 By: yoda on Sun, 12 June 2016 10:26
		Re: Gryphon 68030 By: lynchaj on Mon, 13 June 2016 04:58
		Re: Gryphon 68030 By: lynchaj on Tue, 14 June 2016 03:43
		Re: Gryphon 68030 By: will on Sun, 12 June 2016 16:52
		Re: Gryphon 68030 By: lynchaj on Sun, 12 June 2016 17:16
		Re: Gryphon 68030 By: yoda on Sun, 12 June 2016 18:06
		Re: Gryphon 68030 By: yoda on Sun, 12 June 2016 17:50
		Re: Gryphon 68030 By: will on Sun, 12 June 2016 07:27
		Re: Gryphon 68030 By: yoda on Sun, 12 June 2016 10:19
		Re: Gryphon 68030 By: Andrew B on Sun, 12 June 2016 10:48
		Re: Gryphon 68030 By: lynchaj on Sun, 12 June 2016 17:18
		Re: Gryphon 68030 By: lynchaj on Sun, 12 June 2016 17:40
		Re: Gryphon 68030 By: yoda on Sun, 12 June 2016 17:55
		Re: Gryphon 68030 By: Andrew B on Sun, 12 June 2016 18:05
		Re: Gryphon 68030 By: yoda on Sun, 12 June 2016 18:12
		Re: Gryphon 68030 By: Andrew B on Sun, 12 June 2016 18:30
		Re: Gryphon 68030 By: yoda on Sun, 12 June 2016 20:07
		Re: Gryphon 68030 By: lynchaj on Mon, 13 June 2016 03:22
		Re: Gryphon 68030 By: yoda on Mon, 13 June 2016 08:04
		Re: Gryphon 68030 By: lynchaj on Mon, 13 June 2016 09:17
		Re: Gryphon 68030 By: yoda on Mon, 13 June 2016 09:39
		Re: Gryphon 68030 By: Andrew B on Mon, 13 June 2016 09:59
		Re: Gryphon 68030 By: yoda on Mon, 13 June 2016 10:02
		Re: Gryphon 68030 By: lynchaj on Tue, 14 June 2016 03:18
		Re: Gryphon 68030 By: yoda on Tue, 14 June 2016 06:52
		Re: Gryphon 68030 By: lynchaj on Wed, 15 June 2016 17:36
		Re: Gryphon 68030 By: lynchaj on Thu, 16 June 2016 03:29
		Re: Gryphon 68030 By: lynchaj on Thu, 16 June 2016 03:34
		Re: Gryphon 68030 By: yoda on Thu, 16 June 2016 06:41
		Re: Gryphon 68030 By: lynchaj on Thu, 16 June 2016 08:29
		Re: Gryphon 68030 By: lynchaj on Sat, 18 June 2016 08:38
		Calling on logic equation gurus By: yoda on Fri, 24 June 2016 08:50
		Re: Calling on logic equation gurus By: Andrew B on Fri, 24 June 2016 09:46
		Re: Calling on logic equation gurus By: yoda on Fri, 24 June 2016 11:14
		All: Please review verilog code By: yoda on Fri, 24 June 2016 17:41
		Re: All: Please review verilog code By: lynchaj on Sun, 26 June 2016 13:40
		Re: All: Please review verilog code By: lynchaj on Sun, 26 June 2016 13:44
		Re: All: Please review verilog code By: Andrew B on Mon, 27 June 2016 09:51
		Re: All: Please review verilog code By: lynchaj on Mon, 27 June 2016 11:36
		Re: All: Please review verilog code By: yoda on Mon, 27 June 2016 12:25
		Re: All: Please review verilog code By: lynchaj on Tue, 28 June 2016 03:21
		Re: All: Please review verilog code By: jcoffman on Tue, 28 June 2016 03:29
		Re: All: Please review verilog code By: lynchaj on Tue, 28 June 2016 03:55
		Re: All: Please review verilog code By: yoda on Sun, 26 June 2016 17:02
		Re: All: Please review verilog code By: lynchaj on Mon, 27 June 2016 03:42
		Re: Gryphon 68030 By: lynchaj on Tue, 28 June 2016 15:51
		Re: Gryphon 68030 By: yoda on Tue, 28 June 2016 17:07
		Re: Gryphon 68030 By: lynchaj on Wed, 29 June 2016 03:32
		Re: Gryphon 68030 By: jcoffman on Wed, 29 June 2016 08:01
		Re: Gryphon 68030 By: lynchaj on Wed, 29 June 2016 09:15
		Re: Gryphon 68030 By: lynchaj on Wed, 29 June 2016 16:37
		Re: Gryphon 68030 By: lynchaj on Fri, 08 July 2016 08:18
		Re: Gryphon 68030 By: lynchaj on Sat, 09 July 2016 06:57
		Re: Gryphon 68030 By: lynchaj on Mon, 18 July 2016 17:52
		Re: Gryphon 68030 By: lynchaj on Sat, 23 July 2016 11:56
		Re: Gryphon 68030 By: davetypeguy on Mon, 25 July 2016 10:16
		Re: Gryphon 68030 By: yoda on Mon, 25 July 2016 13:39
		Re: Gryphon 68030 By: davetypeguy on Mon, 25 July 2016 14:46
		Re: Gryphon 68030 By: lynchaj on Tue, 26 July 2016 13:50
		Re: Gryphon 68030 By: lynchaj on Fri, 03 February 2017 05:05
		Re: Gryphon 68030 By: lynchaj on Sat, 04 February 2017 10:23
		Re: Gryphon 68030 By: Andrew B on Sat, 04 February 2017 11:28
		Re: Gryphon 68030 By: computerdoc on Fri, 10 February 2017 02:17
		Re: Gryphon 68030 By: will on Fri, 10 February 2017 03:56
		Re: Gryphon 68030 By: lynchaj on Sat, 11 February 2017 07:19
		Re: Gryphon 68030 By: will on Sat, 11 February 2017 13:20
		Re: Gryphon 68030 By: Andrew B on Sat, 11 February 2017 13:31
		Re: Gryphon 68030 By: lynchaj on Sat, 11 February 2017 13:52
		Re: Gryphon 68030 By: yoda on Sat, 11 February 2017 14:05
		Re: Gryphon 68030 By: will on Sat, 11 February 2017 14:44
		Re: Gryphon 68030 By: computerdoc on Fri, 10 February 2017 02:25
		Re: Gryphon 68030 By: lynchaj on Sat, 11 February 2017 07:06
		Re: Gryphon 68030 By: computerdoc on Sat, 11 February 2017 19:00
		Re: Gryphon 68030 By: lynchaj on Sat, 11 February 2017 08:14
		Re: Gryphon 68030 By: davetypeguy on Sun, 12 February 2017 00:22
		Re: Gryphon 68030 By: yoda on Sun, 12 February 2017 10:52
		Re: Gryphon 68030 By: lynchaj on Sun, 12 February 2017 11:11
		Re: Gryphon 68030 By: Garth on Mon, 13 February 2017 02:07
		Re: Gryphon 68030 By: Andrew B on Fri, 17 February 2017 14:47
		Re: Gryphon 68030 By: denis2342 on Tue, 28 February 2017 06:27
		Re: Gryphon 68030 By: yoda on Tue, 28 February 2017 06:48
		Re: Gryphon 68030 By: denis2342 on Tue, 28 February 2017 07:12
		Re: Gryphon 68030 By: yoda on Tue, 28 February 2017 07:40
		Re: Gryphon 68030 By: will on Tue, 28 February 2017 14:55
		Re: Gryphon 68030 By: denis2342 on Thu, 02 March 2017 20:32
		Re: Gryphon 68030 By: ewout on Fri, 03 March 2017 02:54
		Re: Gryphon 68030 By: lynchaj on Fri, 03 March 2017 03:51
		Re: Gryphon 68030 By: lynchaj on Fri, 03 March 2017 03:54
		Re: Gryphon 68030 By: lynchaj on Mon, 06 March 2017 03:00
		Re: Gryphon 68030 By: ewout on Thu, 09 March 2017 00:58
		Re: Gryphon 68030 By: lynchaj on Thu, 09 March 2017 07:05
		Re: Gryphon 68030 By: lynchaj on Thu, 09 March 2017 07:07
		Re: Gryphon 68030 By: yoda on Thu, 09 March 2017 07:16
		Re: Gryphon 68030 By: ewout on Thu, 09 March 2017 07:33
		Re: Gryphon 68030 By: lynchaj on Thu, 09 March 2017 07:52
		Re: Gryphon 68030 By: yoda on Thu, 09 March 2017 11:50
		Re: Gryphon 68030 By: lynchaj on Thu, 09 March 2017 11:59
		Re: Gryphon 68030 By: yoda on Thu, 09 March 2017 12:32
		Re: Gryphon 68030 By: lynchaj on Thu, 09 March 2017 15:25
		Re: Gryphon 68030 By: yoda on Thu, 09 March 2017 16:01
		Re: Gryphon 68030 By: lynchaj on Thu, 09 March 2017 16:26
		Re: Gryphon 68030 By: yoda on Thu, 09 March 2017 17:13
		Re: Gryphon 68030 By: lynchaj on Fri, 10 March 2017 02:56
		Re: Gryphon 68030 By: yoda on Fri, 10 March 2017 07:52
		Re: Gryphon 68030 By: lynchaj on Fri, 10 March 2017 08:31
		Re: Gryphon 68030 By: lynchaj on Sat, 11 March 2017 05:56
		Re: Gryphon 68030 By: lynchaj on Sat, 11 March 2017 06:13
		Re: Gryphon 68030 By: mikemac on Sat, 11 March 2017 12:30
		Re: Gryphon 68030 By: yoda on Sat, 11 March 2017 12:43
		Re: Gryphon 68030 By: mikemac on Sat, 11 March 2017 14:41
		Re: Gryphon 68030 By: lynchaj on Sun, 12 March 2017 05:21
		Re: Gryphon 68030 By: lynchaj on Sun, 12 March 2017 09:20
		Re: Gryphon 68030 By: lynchaj on Sun, 12 March 2017 10:28
		Re: Gryphon 68030 By: mikemac on Sun, 12 March 2017 14:14
		Re: Gryphon 68030 By: lynchaj on Sun, 12 March 2017 14:34
		Re: Gryphon 68030 By: mikemac on Sun, 12 March 2017 17:40
		Re: Gryphon 68030 By: lynchaj on Mon, 13 March 2017 02:55
		Re: Gryphon 68030 By: lynchaj on Mon, 13 March 2017 05:43
		Re: Gryphon 68030 By: lynchaj on Wed, 15 March 2017 02:54
		Re: Gryphon 68030 By: davetypeguy on Wed, 15 March 2017 09:06
		Re: Gryphon 68030 By: lynchaj on Sat, 11 March 2017 13:00
		Re: Gryphon 68030 By: lynchaj on Sat, 11 March 2017 13:12
		Re: Gryphon 68030 By: yoda on Sat, 11 March 2017 13:23
		Re: Gryphon 68030 By: mikemac on Sat, 08 April 2017 19:59
		Re: Gryphon 68030 By: rhkoolstar on Sat, 08 April 2017 23:27
		Re: Gryphon 68030 By: plasmo on Sun, 09 April 2017 05:32
		Re: Gryphon 68030 By: tobster on Wed, 15 March 2017 13:08
		Re: Gryphon 68030 By: yoda on Wed, 15 March 2017 14:02
		Re: Gryphon 68030 By: lynchaj on Thu, 16 March 2017 13:52
		Re: Gryphon 68030 By: mikemac on Tue, 21 March 2017 09:55
		Re: Gryphon 68030 By: norwestrzh on Tue, 21 March 2017 10:22
		Re: Gryphon 68030 By: yoda on Tue, 21 March 2017 10:46
		Re: Gryphon 68030 By: lynchaj on Thu, 23 March 2017 05:44
		Re: Gryphon 68030 By: lynchaj on Sat, 25 March 2017 06:30
		Re: Gryphon 68030 By: lynchaj on Sat, 25 March 2017 08:03
		Re: Gryphon 68030 By: mikemac on Sat, 25 March 2017 16:19
		Re: Gryphon 68030 By: jcoffman on Sat, 25 March 2017 18:07
		Re: Gryphon 68030 By: mikemac on Sat, 25 March 2017 21:05
		Re: Gryphon 68030 By: yoda on Sun, 26 March 2017 08:32
		Re: Gryphon 68030 By: tobster on Sun, 26 March 2017 02:25
		Re: Gryphon 68030 By: mikemac on Sun, 26 March 2017 09:18
		Re: Gryphon 68030 By: lynchaj on Sun, 26 March 2017 09:47
		Re: Gryphon 68030 By: mikemac on Mon, 27 March 2017 09:18
		Re: Gryphon 68030 By: lynchaj on Mon, 27 March 2017 09:30
		Re: Gryphon 68030 By: mikemac on Thu, 30 March 2017 10:13
		Re: Gryphon 68030 By: lynchaj on Thu, 30 March 2017 10:46
		Re: Gryphon 68030 By: mikemac on Thu, 30 March 2017 11:56
		Re: Gryphon 68030 By: Andrew B on Thu, 30 March 2017 13:50
		Re: Gryphon 68030 By: mikemac on Thu, 30 March 2017 14:03
		Re: Gryphon 68030 By: mikemac on Thu, 30 March 2017 14:37
		Re: Gryphon 68030 By: tingo on Mon, 03 April 2017 13:44
		Re: Gryphon 68030 By: mikemac on Mon, 03 April 2017 15:28
		Re: Gryphon 68030 By: lynchaj on Tue, 04 April 2017 04:02
		Re: Gryphon 68030 By: mikemac on Tue, 04 April 2017 07:50
		Re: Gryphon 68030 By: lynchaj on Fri, 07 April 2017 04:31
		Re: Gryphon 68030 By: rhkoolstar on Sat, 08 April 2017 11:30
		Re: Gryphon 68030 By: lynchaj on Sat, 08 April 2017 11:46
		Re: Gryphon 68030 By: mikemac on Sat, 08 April 2017 12:48
		Re: Gryphon 68030 By: plasmo on Sun, 09 April 2017 20:22
		Re: Gryphon 68030 By: rhkoolstar on Sun, 09 April 2017 23:16
		Re: Gryphon 68030 By: lynchaj on Mon, 10 April 2017 03:00
		Re: Gryphon 68030 By: lynchaj on Mon, 10 April 2017 03:18
		Re: Gryphon 68030 By: plasmo on Mon, 10 April 2017 12:38
		Re: Gryphon 68030 By: commodorejohn on Mon, 17 April 2017 15:14
		Re: Gryphon 68030 By: lynchaj on Tue, 18 April 2017 04:21
		Re: Gryphon 68030 By: yoda on Tue, 18 April 2017 07:04
		Re: Gryphon 68030 By: lynchaj on Tue, 18 April 2017 08:57
		Re: Gryphon 68030 By: yoda on Tue, 18 April 2017 09:53
		Re: Gryphon 68030 By: commodorejohn on Tue, 18 April 2017 09:59
		Re: Gryphon 68030 By: lynchaj on Tue, 18 April 2017 11:35
		Re: Gryphon 68030 By: mikemac on Tue, 18 April 2017 16:48
		Re: Gryphon 68030 By: lynchaj on Tue, 18 April 2017 17:47
		Re: Gryphon 68030 By: lynchaj on Wed, 19 April 2017 02:55
		Re: Gryphon 68030 By: yoda on Wed, 19 April 2017 14:15
		Re: Gryphon 68030 By: lynchaj on Wed, 19 April 2017 15:56
		Re: Gryphon 68030 By: mikemac on Thu, 20 April 2017 11:15
		Re: Gryphon 68030 By: lynchaj on Thu, 20 April 2017 12:05
		Re: Gryphon 68030 By: mikemac on Thu, 20 April 2017 12:33
		Re: Gryphon 68030 By: lynchaj on Thu, 20 April 2017 15:58
		Re: Gryphon 68030 By: mikemac on Thu, 20 April 2017 16:51
		Re: Gryphon 68030 By: lynchaj on Fri, 21 April 2017 02:54
		Re: Gryphon 68030 By: yoda on Fri, 21 April 2017 08:54
		Re: Gryphon 68030 By: lynchaj on Fri, 21 April 2017 09:14
		Re: Gryphon 68030 By: yoda on Fri, 21 April 2017 11:15
		Re: Gryphon 68030 By: lynchaj on Fri, 21 April 2017 12:02
		Re: Gryphon 68030 By: plasmo on Mon, 10 April 2017 12:31

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