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同步串行数据发送电路SSDT的基本功能是将并行数据转换成串行数据并进行同步发送。系统写入和读出时序完全兼容Intel8086时序。 系统以同步信号开始连续发送四个字节

# Reading C:/Modeltech_5.8/tcl/vsim/pref.tcl 
# //  ModelSim SE 5.8 Nov 01 2003 
# //
# //  Copyright Model Technology, a Mentor Graphics Corporation company, 2003
# //                         All Rights Reserved.
# //                   UNPUBLISHED, LICENSED SOFTWARE.
# //         CONFIDENTIAL AND PROPRIETARY INFORMATION WHICH IS THE
# //        PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS.
# //
#  OpenFile "C:/Modeltech_5.8/Mywork/SSDT/wave_final_no_zero" 
view wave
# .wave
do C:/Modeltech_5.8/Mywork/SSDT/wave.do
project open C:/Modeltech_5.8/Mywork/SSDT/ssdt
# Loading project ssdt
# Compile of SSDT_TB.vhd was successful.
# Compile of SSDT.vhd was successful.
# 2 compiles, 0 failed with no errors. 
vsim work.ssdt_tb
# vsim work.ssdt_tb 
# Loading C:/Modeltech_5.8/win32/../std.standard
# Loading C:/Modeltech_5.8/win32/../ieee.std_logic_1164(body)
# Loading C:/Modeltech_5.8/win32/../ieee.std_logic_arith(body)
# Loading C:/Modeltech_5.8/win32/../ieee.std_logic_unsigned(body)
# Loading work.ssdt_tb(behavior)
# Loading work.ssdt(rtl)
# ** Warning: (vsim-WLF-5000) Log file vsim.wlf currently in use.
# File in use by: Administrator  Hostname: AMEC-2B2D55514D  ProcessID: 1380
#           Attempting to use alternate file "C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\wlft3".
# ** Warning: (vsim-WLF-5001) Could not open log file vsim.wlf.  Using C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\wlft3 instead.
# Compile of SSDT_TB.vhd was successful.
# Compile of SSDT.vhd was successful.
# 2 compiles, 0 failed with no errors. 
vsim work.ssdt_tb
# vsim work.ssdt_tb 
# Loading C:/Modeltech_5.8/win32/../std.standard
# Loading C:/Modeltech_5.8/win32/../ieee.std_logic_1164(body)
# Loading C:/Modeltech_5.8/win32/../ieee.std_logic_arith(body)
# Loading C:/Modeltech_5.8/win32/../ieee.std_logic_unsigned(body)
# Loading work.ssdt_tb(behavior)
# Loading work.ssdt(rtl)
# ** Warning: (vsim-WLF-5000) Log file vsim.wlf currently in use.
# File in use by: Administrator  Hostname: AMEC-2B2D55514D  ProcessID: 1380
#           Attempting to use alternate file "C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\wlft4".
# ** Warning: (vsim-WLF-5001) Could not open log file vsim.wlf.  Using C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\wlft4 instead.
run
# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).
#    Time: 0 ns  Iteration: 0  Instance: /ssdt_tb/u1
# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).
#    Time: 0 ns  Iteration: 0  Instance: /ssdt_tb/u1
# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).
#    Time: 0 ns  Iteration: 1  Instance: /ssdt_tb/u1
# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).
#    Time: 0 ns  Iteration: 1  Instance: /ssdt_tb/u1
write format wave -window .wave C:/Modeltech_5.8/Mywork/SSDT/wave_zero
write format wave -window .wave C:/Modeltech_5.8/Mywork/SSDT/wave_zero
quit -sim
# Compile of SSDT_TB.vhd was successful.
# Compile of SSDT.vhd was successful.
# 2 compiles, 0 failed with no errors. 
vsim work.ssdt_tb
# vsim work.ssdt_tb 
# Loading C:/Modeltech_5.8/win32/../std.standard
# Loading C:/Modeltech_5.8/win32/../ieee.std_logic_1164(body)
# Loading C:/Modeltech_5.8/win32/../ieee.std_logic_arith(body)
# Loading C:/Modeltech_5.8/win32/../ieee.std_logic_unsigned(body)
# Loading work.ssdt_tb(behavior)
# Loading work.ssdt(rtl)
# ** Warning: (vsim-WLF-5000) Log file vsim.wlf currently in use.
# File in use by: Administrator  Hostname: AMEC-2B2D55514D  ProcessID: 1380
#           Attempting to use alternate file "C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\wlft5".
# ** Warning: (vsim-WLF-5001) Could not open log file vsim.wlf.  Using C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp\wlft5 instead.
run
# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).
#    Time: 0 ns  Iteration: 0  Instance: /ssdt_tb/u1
# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).
#    Time: 0 ns  Iteration: 0  Instance: /ssdt_tb/u1
# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).
#    Time: 0 ns  Iteration: 1  Instance: /ssdt_tb/u1
# ** Warning: There is an 'U'|'X'|'W'|'Z'|'-' in an arithmetic operand, the result will be 'X'(es).
#    Time: 0 ns  Iteration: 1  Instance: /ssdt_tb/u1
write format wave -window .wave C:/Modeltech_5.8/Mywork/SSDT/wave_nozero
destroy .wave