From: Anders Nordstrom (andersn@nortelnetworks.com)
Date: Fri Apr 16 1999 - 05:48:28 PDT
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Team,
Just a reminder about our conference call on Monday.
Anders
<PRE>--
+-------------------------------------------------------------------------+
| Anders Nordstrom |
| Manager OC192 Data ASIC Development |
| |
| Nortel Networks Email: andersn@nortelnetworks.com |
| P.O. Box 3511 Station C Phone: 613-763-9186 |
| Ottawa, Ontario K1Y 4H7 Fax: 613-763-2626 |
+-------------------------------------------------------------------------+</PRE>
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</x-html>Message-ID: <37126AB4.EA89ACCD@americasm01.nt.com>
Date: Mon, 12 Apr 1999 17:50:44 -0400
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Team,
I have set up a conference call so that we can continue our discussion
on Configurations
<BR>and to work through the open errata and enhancements.
<BR>I will send out a separate email with the open items.
<BR>
<UL>
<LI>
Date: Monday April 19, 1999</LI>
<LI>
Time: 9:00 am - 12:00 pm PDT (12:00 - 3:00 pm EDT)</LI>
<LI>
Phone: 613-763-6338</LI>
<LI>
passcode: 185505#</LI>
</UL>
<H1>
Agenda</H1>
9:00 - 10:00 Configurations
<BR>10:00 -
Open errata and enhancements.
<BR>
Vote on B11 and BE79 proposals that are attached.<BR>
Vote on other proposals.
Regards,
<BR>
<BR>
Anders
<PRE>--
+-------------------------------------------------------------------------+
| Anders Nordstrom |
| Manager OC192 Data ASIC Development |
| |
| Nortel Networks Email: andersn@nortelnetworks.com |
| P.O. Box 3511 Station C Phone: 613-763-9186 |
| Ottawa, Ontario K1Y 4H7 Fax: 613-763-2626 |
+-------------------------------------------------------------------------+</PRE>
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<HEAD>
<TITLE> B11 </TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF">
<BR>
<HR SIZE=5 NOSHADE>
<H2> B11 - Automatic width extension beyond 32 bits </H2>
<TABLE BORDER COLS=2 WIDTH="75%" >
<TR><TD>
Section: </TD><TD> 2.5.1 page 7
</TD></TR><TR><TD>
Date Submitted: </TD><TD> 970319
</TD></TR><TR><TD>
Requestor: </TD><TD> adamk@cyrix.com (Adam Krolnik)
</TD></TR><TR><TD>
Status: </TD><TD> proposal
</TD></TR><TR><TD>
Analyzed by: </TD><TD> BTF team and Anders Nordstrom
</TD></TR><TR><TD>
Synthesizable: </TD><TD> Yes
</TD></TR>
</TABLE>
<H3> Details </H3>
Width extension.
If you want to size a constant you need to specify a width to it. E.g. 7'h2 <BR>
If you don't specify a size ('h123) it has a machine word width (I.e. 32 <BR>
bits.) This causes the following statements to provide unexpected behavior:
<PRE>
reg[63:0] a;
initial a = 'h0;
reg[63:0] b;
initial b = 'bz;
</PRE>
Rather, the unsized constant should be extended (signed?, zero?, last-bit?)<BR>
to the width of the lhs. In the example, 'a' should have the value 64'h0, <BR>
not {32'bx, 32'b0}.
<p>>From cliffc@europa.com Fri May 2 11:41:32 1997
I could support this request.
I always find it amusing to run the following code through Synopsys, only to
<BR> find 32 tri-state drivers and 32 and gates with one input tied low.
<PRE>
module driver (y, a, en);
output [63:0] y;
input [63:0] a;
input en;
assign y = en ? a : 'bz;
endmodule
</PRE>
Note: This could potentially break exiting models if anyone has been <BR>
counting on zero-extension for busses greater that 32 bits wide, but it <BR>
seems like an extremely risky strategy to intentionally employ that coding
style.
Regards - Cliff Cummings
From: mac@silicon-sorcery.com
Not unreasonable; the current behavior is not really serving <BR>
any useful purpose, except to confuse newbies.
I would support this proposal. one would need to consider the <BR>
size of unsized constants in expression context:
<PRE>
wire [24:0] a, b;
assign a = (b + 'h23)>>2;
</PRE>
<H3> Proposal </H3>
Add the following sentence at the end of the first paragraph
on page 7 in the 1995 LRM or after the third paragraph on page
9 in Draft 2: <P>
"Unsized unsigned constants where the high order bit is unknown (X or x)
or tri-state (Z or z) are extended indefinitely"
Add to the "Automatic left padding" example on page 8 (10): <BR>
<PRE>
reg [84:0] e, f, g;
e = 'h5; // yields {82{1'b0},3'b101}
f = 'hx; // yields {85{1'hx}}
g = 'hz; // yields {85{1'hz}}
</PRE>
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<HEAD>
<TITLE> BE79 </TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF">
<BR>
<HR SIZE=5 NOSHADE>
<H2> BE79 - Draft 1 Errata - related to B19 </H2>
<TABLE BORDER COLS=2 WIDTH="75%" >
<TR><TD>
Section: </TD><TD> 2.5.1 & 4.1.12
</TD></TR><TR><TD>
Date Submitted: </TD><TD> 981117
</TD></TR><TR><TD>
Requestor: </TD><TD> Tom Fitzpatrick (tfitz@cadence.com)
</TD></TR><TR><TD>
Status: </TD><TD> Proposal
</TD></TR><TR><TD>
Analyzed by: </TD><TD> Tom Fitzpatrick / Anders Nordstrom
</TD></TR>
</TABLE>
<H3> Details </H3>
Section: 2.5.1 <BR>
Page: 8 in 1995 LRM <BR>
Page: 10 in Draft 2
Note 1 should be changed to read: <BR>
"Sized negative constant numbers and sized signed cnstant numbers are
sign-extended when
assigned to a register data type, regardless of whether the register itself
is signed or not."
-Tom
Note from BTF call: Should there be any reference to a negative number?
<PRE>
---------------
Tom Fitzpatrick
Senior Technical Marketing Manager Cadence Design Systems, Inc.
Cycle Simulation Products 270 Billerica Rd.
Logic Design and Verification Business Unit Chelmsford, MA 01824
x6438 (978)446-6438
</PRE>
<H3> Proposal </H3>
Change Note 1 on page 10 in Draft 2 to read:
"Sized negative constant numbers and sized signed cnstant numbers are
sign-extended when
assigned to a register data type, regardless of whether the register itself
is signed or not."
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Message-ID: <3717319C.EA1B3561@americasm01.nt.com>
Date: Fri, 16 Apr 1999 08:48:28 -0400
From: "Anders Nordstrom" <andersn@nortelnetworks.com>
Reply-To: "Anders Nordstrom" <andersn@nortelnetworks.com>
Organization: Nortel Networks
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