Combinatorial logic difference between Spartan 6 and Spartan 3

Hello,
I'm porting a project from the Spartan 3 series to the Spartan 6 and encountered a difference in implementation between the two families. I've added the part of the code that is responsible for the difference in attachment. It's written fully combinatorial which I know is usually a bad idea, but I'll have to rewrite a much larger part of the project if I want to change this module to synchronous logic.
The module itself is used in a motor H-bridge driver and checks if the desired current level in the motor is reached. If so, it starts a fixed freewheel (off) period which is implemented as a counter and decreased every time a pulse arives on the freewheelclk input. When this module is implemented on a Spartan 3, the counter correctly counts down every pulse. However it counts down only every 4 pulses on a Spartan 6.
In behavioural simulation the code works fine, but Chipscope verified the counter value decreasing only every 4 pulses when actually running on the Spartan 6.
I assume this is due to a difference in combinatorial logic (timing) in the slices, but find it difficult to pinpoint the exact problem. What is the best way to further analyse this problem and/or what could be a fix so this code behaves the same on both platforms?
Additional details which I don't know are relevant:
- The Spartan 3 project was in ISE 14.7, the Spartan 6 project is in Planahead 14.7
- The Spartan 3 is a XC3S200-4TQG114C
- The Spartan 6 is a XC6SLX9-2CSG225C

Thanks for adding this details:
I would like to focus on design functionality.
The major difference in the in ISE/PlanAhead 14.7, with respect to synthesis is the XST synthesis parser.
When Spartan-3 selected for a project in ISE/PA XST old parser is picked.
When Spartan-6 selected for a project in ISE/PA XST New parser is picked.
The important point to note is ISE and PlanaAhead default synthesis options are not same.
I would still try to work with ISE 14.7 for spartan-6 ported design which is easy to understand the root cause of the incorrect behavior.
In ISE 14.7, inorder to understand the difference is because of the parser, I would start verifying behavioral and Post-synthesis simulation.
Try comparing the synthesis reports to understand if there is any difference in analyzing the code or optimization.
You may share the project and the simulation test bench, if help needed in investigation.
Regards,
Achutha

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My question is now answered.
[https://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/70a25d3a-e4fa-2a10-43b5-b4169ba3eb17]
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1.Difference between inner join and outer join
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Table 1                      Table 2
A
B
C
D
D
E
F
G
H
a1
b1
c1
1
1
e1
f1
g1
h1
a2
b2
c2
1
3
e2
f2
g2
h2
a3
b3
c3
2
4
e3
f3
g3
h3
a4
b4
c4
3
|--|||--|
    Inner Join
    |--||||||||--|
    | A | B | C | D | D | E | F | G | H |
    |--||||||||--|
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    | a2 | b2 | c2 | 1 | 1 | e1 | f1 | g1 | h1 |
    | a4 | b4 | c4 | 3 | 3 | e2 | f2 | g2 | h2 |
    |--||||||||--|
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              FCONNID = PCONNID
    WHERE P~CITYFROM = 'FRANKFURT'
      AND P~CITYTO   = 'NEW YORK'
      AND F~FLDATE BETWEEN '20010910' AND '20010920'
      AND FSEATSOCC < FSEATSMAX.
WRITE: / DATE, CARRID, CONNID.
ENDSELECT.
If there are columns with the same name in both tables, you must distinguish between them by prefixing the field descriptor with the table name or a table alias.
Note
In order to determine the result of a SELECT command where the FROM clause contains a join, the database system first creates a temporary table containing the lines that meet the ON condition. The WHERE condition is then applied to the temporary table. It does not matter in an inner join whether the condition is in the ON or WHEREclause. The following example returns the same solution as the previous one.
Example
Output of a list of all flights from Frankfurt to New York between September 10th and 20th, 2001 that are not sold out:
DATA: DATE   LIKE SFLIGHT-FLDATE,
      CARRID LIKE SFLIGHT-CARRID,
      CONNID LIKE SFLIGHT-CONNID.
SELECT FCARRID FCONNID F~FLDATE
    INTO (CARRID, CONNID, DATE)
    FROM SFLIGHT AS F INNER JOIN SPFLI AS P
           ON FCARRID = PCARRID
    WHERE FCONNID = PCONNID
      AND P~CITYFROM = 'FRANKFURT'
      AND P~CITYTO   = 'NEW YORK'
      AND F~FLDATE BETWEEN '20010910' AND '20010920'
      AND FSEATSOCC < FSEATSMAX.
WRITE: / DATE, CARRID, CONNID.
ENDSELECT.
Note
Since not all of the database systems supported by SAP use the standard syntax for ON conditions, the syntax has been restricted. It only allows those joins that produce the same results on all of the supported database systems:
Only a table or view may appear to the right of the JOIN operator, not another join expression.
Only AND is possible in the ON condition as a logical operator.
Each comparison in the ON condition must contain a field from the right-hand table.
If an outer join occurs in the FROM clause, all the ON conditions must contain at least one "real" JOIN condition (a condition that contains a field from tabref1 amd a field from tabref2.
Note
In some cases, '*' may be specified in the SELECT clause, and an internal table or work area is entered into the INTO clause (instead of a list of fields). If so, the fields are written to the target area from left to right in the order in which the tables appear in the FROM clause, according to the structure of each table work area. There can then be gaps between table work areas if you use an Alignment Request. For this reason, you should define the target work area with reference to the types of the database tables, not simply by counting the total number of fields. For an example, see below:
Variant 3
... FROM tabref1 LEFT [OUTER] JOIN tabref2 ON cond
Effect
Selects the data from the transparent database tables and/or views specified in tabref1 and tabref2. tabref1 und tabref2 both have either the same form as in variant 1 or are themselves join expressions. The keyword OUTER can be omitted. The database tables or views specified in tabref1 and tabref2 must be recognized by the ABAP-Dictionary.
In order to determine the result of a SELECT command where the FROM clause contains a left outer join, the database system creates a temporary table containing the lines that meet the ON condition. The remaining fields from the left-hand table (tabref1) are then added to this table, and their corresponding fields from the right-hand table are filled with ZERO values. The system then applies the WHERE condition to the table.
Left outer join between table 1 and table 2 where column D in both tables set the join condition:
Table 1                      Table 2
A
B
C
D
D
E
F
G
H
a1
b1
c1
1
1
e1
f1
g1
h1
a2
b2
c2
1
3
e2
f2
g2
h2
a3
b3
c3
2
4
e3
f3
g3
h3
a4
b4
c4
3
|--|||--|
    Left Outer Join
    |--||||||||--|
    | A | B | C | D | D | E | F | G | H |
    |--||||||||--|
    | a1 | b1 | c1 | 1 | 1 | e1 | f1 | g1 | h1 |
    | a2 | b2 | c2 | 1 | 1 | e1 | f1 | g1 | h1 |
    | a3 | b3 | c3 | 2 |NULL|NULL|NULL|NULL|NULL|
    | a4 | b4 | c4 | 3 | 3 | e2 | f2 | g2 | h2 |
    |--||||||||--|
Regards
Prabhu

Whats the actual difference between Business system and Business service

whats the actual difference between Business system and Business service

Business System
1) Business system is a logical system, and there is an importance on physical existence of the system.
2) Also SLD entry is required.
3)It is generally used for SAP applications, this is just a general prinicple followed but not mandatory.
4)This is defined as part of the SLD and is a physical system whose parameters are well defined.
5(Business systems refers to the physical systems, for instance the R/3 system. You define the business systems in the SLD
Business Service
1) You use a Business Service, when you do not have the System details of the the partner system to which you want to communicate. i.e. you have not configured the partner system in SLD.
2) Business Service is an Absract Unit with Sender and Receiver Interfaces,In this case you need to explicitly add the message interfaces while doing configuration in ID.
3) It is generally used for NON-SAP applications, this is just a general prinicple followed but not mandatory.
4) This is not defined as part of SLD and whose technical parameters are not completely known.
5)Business service is used when the message is not addressed to a business system. It is used mostly in B2B scenarios.
Also go through these links and threads...
http://help.sap.com/saphelp_nw2004s/helpdata/en/c7/301640033ae569e10000000a155106/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/14/80243b4a66ae0ce10000000a11402f/frameset.htm
Business service or Business system??
Business Service vs Business System in Integration Directory.
Best Regards

Difference between business blueprint and functional spec

hello
can somebody please tell me the difference between business blueprint and functional spec and how they are interrelated
Thanks

Hi Comandante,
Business Blue print is a detailed documentation of the requirements gathered from client (The objects we need to develop are modified depending upon clients requirements).It represents the business process requirements of the company. It is an agreed statement of how the company intends to run its business within SAP system.
Functional specifications (functional specs), in the end, are the blueprint for how you want a particular report and transaction to look and work. It details what the report will do, how a user will interact with it, and what it will look like. By creating a blueprint of the report or transaction first, time and productivity are saved during the development stage because the programmers can program instead of also working out the logic of the user-experience. It will also enable you to manage the expectations of your clients or management, as they will know exactly what to expect. Functional Spec streamlines the development process.
A functional specification is a formal document used to describe in detail for software developers a product's intended capabilities, appearance, and interactions with users. It guidelines and continuing reference point as the developers write the programming code.
Other processes include Requirements, Objectives,Logic Specification,User documentation,The Final Product.
Hope this Helps, Revert for any further info.
Cheers,
Tanish

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