app2.2.htm

介绍asci设计的一本书

hex_digit ::= [61] [95LRM 2.5.1] [60]</P>
<P CLASS="zAppComputer">
<A NAME="pgfId=36233">
 </A>
	<SPAN CLASS="Bold">
x </SPAN>
|<SPAN CLASS="Bold">
 X </SPAN>
|<SPAN CLASS="Bold">
 z </SPAN>
|<SPAN CLASS="Bold">
 Z </SPAN>
|<SPAN CLASS="Bold">
 0 </SPAN>
|<SPAN CLASS="Bold">
 1 </SPAN>
|<SPAN CLASS="Bold">
 2 </SPAN>
|<SPAN CLASS="Bold">
 3 </SPAN>
|<SPAN CLASS="Bold">
 4 </SPAN>
|<SPAN CLASS="Bold">
 5 </SPAN>
|<SPAN CLASS="Bold">
 6 </SPAN>
|<SPAN CLASS="Bold">
 7 </SPAN>
|<SPAN CLASS="Bold">
 8 </SPAN>
|<SPAN CLASS="Bold">
 9 </SPAN>
</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=36234">
 </A>
<SPAN CLASS="Bold">
	</SPAN>
|<SPAN CLASS="Bold">
 a </SPAN>
|<SPAN CLASS="Bold">
 b </SPAN>
|<SPAN CLASS="Bold">
 c </SPAN>
|<SPAN CLASS="Bold">
 d </SPAN>
|<SPAN CLASS="Bold">
 e </SPAN>
|<SPAN CLASS="Bold">
 f </SPAN>
|<SPAN CLASS="Bold">
 A </SPAN>
|<SPAN CLASS="Bold">
 B </SPAN>
|<SPAN CLASS="Bold">
 C </SPAN>
|<SPAN CLASS="Bold">
 D </SPAN>
|<SPAN CLASS="Bold">
 E </SPAN>
|<SPAN CLASS="Bold">
 F</SPAN>
 </P>
<P CLASS="zAppComputerOneLNmbr">
<A NAME="pgfId=43152">
 </A>
hex_number ::= [114] [95LRM 2.5.1] [ size ] hex_base hex_digit { _ | hex_digit } [61]</P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=43153">
 </A>
identifier ::= [see <A HREF="APP2.3.htm#21396" CLASS="XRef">
Table&nbsp;B.1</A>
] [95LRM 2.7] IDENTIFIER [ { <SPAN CLASS="Bold">
.</SPAN>
 IDENTIFIER } ] [62]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=43154">
 </A>
	The period in identifier may not be preceded or followed by a space.</P>
<P CLASS="zAppComputerOneLNmbr">
<A NAME="pgfId=17936">
 </A>
IDENTIFIER ::= [62] [95LRM 2.7] simple_identifier | escaped_identifier [63]</P>
<P CLASS="zAppComputerOneLNmbr">
<A NAME="pgfId=17937">
 </A>
initial_construct ::= [94] [95LRM 9.9.1] <SPAN CLASS="ComputerKeyword">
initial</SPAN>
 statement [64]</P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17938">
 </A>
init_val ::= [200] [95LRM 8.1, 8.5] [65]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=18846">
 </A>
	<SPAN CLASS="Bold">
1&#8217;b0 </SPAN>
|<SPAN CLASS="Bold">
 1&#8217;b1 </SPAN>
|<SPAN CLASS="Bold">
 1&#8217;bx </SPAN>
|<SPAN CLASS="Bold">
 1&#8217;bX </SPAN>
|<SPAN CLASS="Bold">
 1&#8217;B0 </SPAN>
|<SPAN CLASS="Bold">
 1&#8217;B1 </SPAN>
|<SPAN CLASS="Bold">
 1&#8217;Bx </SPAN>
|<SPAN CLASS="Bold">
 1&#8217;BX </SPAN>
|<SPAN CLASS="Bold">
 1 </SPAN>
|<SPAN CLASS="Bold">
 0 </SPAN>
</P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17940">
 </A>
inout_declaration ::= [95, 190] [95LRM 12.3.2] [66]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=43164">
 </A>
	<SPAN CLASS="ComputerKeyword">
inout</SPAN>
 [ range ] list_of_port_identifiers <SPAN CLASS="Bold">
; </SPAN>
</P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17941">
 </A>
inout_terminal ::= [134, 137] [95LRM 7.1] [67]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=18861">
 </A>
	<SPAN CLASS="ComputerEmphasis">
terminal</SPAN>
_identifier | <SPAN CLASS="ComputerEmphasis">
terminal</SPAN>
_identifier <SPAN CLASS="Outline">
[</SPAN>
 constant_expression <SPAN CLASS="Outline">
]</SPAN>
 </P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17943">
 </A>
input_declaration ::= [57, 95, 203] [95LRM 12.3.2] [68]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=43166">
 </A>
	<SPAN CLASS="ComputerKeyword">
input</SPAN>
 [ range ] list_of_port_identifiers <SPAN CLASS="Bold">
; </SPAN>
</P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17944">
 </A>
input_identifier ::= [175] [95LRM 13.3.2] [69]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=43168">
 </A>
	<SPAN CLASS="ComputerEmphasis">
input_port</SPAN>
_identifier | <SPAN CLASS="ComputerEmphasis">
inout_port</SPAN>
_identifier </P>
<P CLASS="zAppComputerOneLNmbr">
<A NAME="pgfId=17945">
 </A>
input_terminal ::= [12, 45, 98, 116, 118] [95LRM 7.1] <SPAN CLASS="ComputerEmphasis">
scalar</SPAN>
_expression [70]</P>
<P CLASS="zAppComputerOneLNmbr">
<A NAME="pgfId=17946">
 </A>
integer_declaration ::= [7, 95] [95LRM 3.9] <SPAN CLASS="ComputerKeyword">
integer</SPAN>
 list_of_register_identifiers <SPAN CLASS="Bold">
;</SPAN>
 [71]</P>
<P CLASS="zAppComputerOneLNmbr">
<A NAME="pgfId=17947">
 </A>
level_input_list ::= [14, 167] [95LRM 8.1, 8.1.6] level_symbol { level_symbol } [72]</P>
<P CLASS="zAppComputerOneLNmbr">
<A NAME="pgfId=17948">
 </A>
level_symbol ::= [24, 40, 41, 72] [95LRM 8.1, 8.1.6] <SPAN CLASS="Bold">
0 </SPAN>
|<SPAN CLASS="Bold">
 1 </SPAN>
|<SPAN CLASS="Bold">
 x </SPAN>
|<SPAN CLASS="Bold">
 X </SPAN>
|<SPAN CLASS="Bold">
 ? </SPAN>
|<SPAN CLASS="Bold">
 b </SPAN>
|<SPAN CLASS="Bold">
 B </SPAN>
[73]</P>
<P CLASS="zAppComputerOneLNmbr">
<A NAME="pgfId=17949">
 </A>
limit_value ::= [152] [95LRM 13.7] constant_mintypmax_expression [74]</P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17950">
 </A>
list_of_module_connections ::= [92] [95LRM 12.1.2, 12.3.3, 12.3.4] [75]</P>
<P CLASS="zAppComputer">
<A NAME="pgfId=17951">
 </A>
	 ordered_port_connection { <SPAN CLASS="Bold">
,</SPAN>
 ordered_port_connection } </P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=17952">
 </A>
	| named_port_connection { <SPAN CLASS="Bold">
,</SPAN>
 named_port_connection } </P>
<P CLASS="zAppComputerOneLNmbr">
<A NAME="pgfId=17953">
 </A>
list_of_net_assignments ::= [22] [95LRM 3.10] net_assignment { <SPAN CLASS="Bold">
,</SPAN>
 net_assignment } [76]</P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17954">
 </A>
list_of_net_decl_assignments ::= [107] [95LRM 3.2.1] [77]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=18860">
 </A>
	net_decl_assignment { <SPAN CLASS="Bold">
,</SPAN>
 net_decl_assignment } </P>
<P CLASS="zAppComputerOneLNmbr">
<A NAME="pgfId=18855">
 </A>
list_of_net_identifiers ::= [107] [95LRM 2.7] <SPAN CLASS="ComputerEmphasis">
net</SPAN>
_identifier { <SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
net</SPAN>
_identifier } [78]</P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=18856">
 </A>
list_of_param_assignments ::= [129, 130] [95LRM 3.10] [79]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=18857">
 </A>
	param_assignment { <SPAN CLASS="Bold">
,</SPAN>
 param_assignment } </P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17959">
 </A>
list_of_path_delay_expressions ::= [140] [95LRM 13.4] [80]</P>
<P CLASS="zAppComputer">
<A NAME="pgfId=17960">
 </A>
	 <SPAN CLASS="ComputerEmphasis">
t</SPAN>
_path_delay_expression </P>
<P CLASS="zAppComputer">
<A NAME="pgfId=17961">
 </A>
	| <SPAN CLASS="ComputerEmphasis">
trise</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
tfall</SPAN>
_path_delay_expression </P>
<P CLASS="zAppComputer">
<A NAME="pgfId=17962">
 </A>
	| <SPAN CLASS="ComputerEmphasis">
trise</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
tfall</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
tz</SPAN>
_path_delay_expression </P>
<P CLASS="zAppComputer">
<A NAME="pgfId=17964">
 </A>
	| <SPAN CLASS="ComputerEmphasis">
t01</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
t10</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
t0z</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 </P>
<P CLASS="zAppComputer">
<A NAME="pgfId=17966">
 </A>
	<SPAN CLASS="ComputerEmphasis">
 tz1</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
t1z</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
tz0</SPAN>
_path_delay_expression </P>
<P CLASS="zAppComputer">
<A NAME="pgfId=17968">
 </A>
	| <SPAN CLASS="ComputerEmphasis">
t01</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
t10</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
t0z</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 </P>
<P CLASS="zAppComputer">
<A NAME="pgfId=17970">
 </A>
	 <SPAN CLASS="ComputerEmphasis">
tz1</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
t1z</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
tz0</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 </P>
<P CLASS="zAppComputer">
<A NAME="pgfId=17972">
 </A>
	 <SPAN CLASS="ComputerEmphasis">
t0x</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
tx1</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
t1x</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 </P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=17974">
 </A>
	 <SPAN CLASS="ComputerEmphasis">
tx0</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
txz</SPAN>
_path_delay_expression<SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
tzx</SPAN>
_path_delay_expression </P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17976">
 </A>
list_of_path_inputs ::= [53, 54] [95LRM 13.3.2] [81]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=17977">
 </A>
	specify_input_terminal_descriptor { <SPAN CLASS="Bold">
,</SPAN>
 specify_input_terminal_descriptor } </P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17978">
 </A>
list_of_path_outputs ::= [53, 54] [95LRM 13.3.2] [82]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=17979">
 </A>
	specify_output_terminal_descriptor { <SPAN CLASS="Bold">
,</SPAN>
 specify_output_terminal_descriptor } </P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17980">
 </A>
list_of_ports ::= [91] [95LRM 12] <SPAN CLASS="Bold">
(</SPAN>
 port { <SPAN CLASS="Bold">
,</SPAN>
 port } <SPAN CLASS="Bold">
)</SPAN>
 [83]</P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17981">
 </A>
list_of_port_identifiers ::= [66, 68, 123] [95LRM 12.3.2] [84]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=43169">
 </A>
	<SPAN CLASS="ComputerEmphasis">
port</SPAN>
_identifier { <SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
port</SPAN>
_identifier } </P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17982">
 </A>
list_of_real_identifiers ::= [155, 156] [95LRM 2.7] [85]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=43171">
 </A>
	<SPAN CLASS="ComputerEmphasis">
real</SPAN>
_identifier { <SPAN CLASS="Bold">
,</SPAN>
 <SPAN CLASS="ComputerEmphasis">
real</SPAN>
_identifier } </P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=39210">
 </A>
list_of_register_identifiers ::= [71, 160, 193] [95LRM 3.2.2] [86]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=43172">
 </A>
	register_name { <SPAN CLASS="Bold">
,</SPAN>
 register_name } </P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=39211">
 </A>
list_of_specparam_assignments ::= [180] [95LRM 13.2] [87]</P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=39212">
 </A>
	specparam_assignment { <SPAN CLASS="Bold">
,</SPAN>
 specparam_assignment } </P>
<P CLASS="zAppComputerOneLNmbr">
<A NAME="pgfId=17985">
 </A>
long_comment ::= [15] [95LRM 2.3] <SPAN CLASS="Bold">
/*</SPAN>
 comment_text <SPAN CLASS="Bold">
*/</SPAN>
 [88]</P>
<P CLASS="zAppComputerNmbr">
<A NAME="pgfId=17986">
 </A>
loop_statement ::= [181] [95LRM 9.6] [89]</P>
<P CLASS="zAppComputer">
<A NAME="pgfId=17987">
 </A>
	| <SPAN CLASS="ComputerKeyword">
forever</SPAN>
 statement </P>
<P CLASS="zAppComputer">
<A NAME="pgfId=17988">
 </A>
	| <SPAN CLASS="ComputerKeyword">
repeat</SPAN>
 <SPAN CLASS="Bold">
(</SPAN>
 expression <SPAN CLASS="Bold">
)</SPAN>
 statement </P>
<P CLASS="zAppComputer">
<A NAME="pgfId=17989">
 </A>
	| <SPAN CLASS="ComputerKeyword">
while</SPAN>
 <SPAN CLASS="Bold">
(</SPAN>
 expression <SPAN CLASS="Bold">
)</SPAN>
 statement </P>
<P CLASS="zAppComputerLast">
<A NAME="pgfId=17990">
 </A>
	| <SPAN CLASS="ComputerKeyword">
for</SPAN>
 <SPAN CLASS="Bold">
(</SPAN>
 reg_assignment <SPAN CLASS="Bold">
;</SPAN>
 expression <SPAN CLASS="Bold">
;</SPAN>