LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-; KCPSM3 Program - Control and calculation for Frequency Generator design using the
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;                 Spartan-3E Starter Kit.
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
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INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-; Interfaces with the rotary encoder and LCD display to enable a frequency to be set.
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-; Converts the BCD frequency value into a binary integer and then performs the high
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-; precision calculation necessary to derive the control numbers required by the high
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-; performance Direct Digital Synthesis (DDS) circuit implemented in hardware.
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-; LEDs are connected and used as edit mode indicators.
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-; Substantial comments are included in line with the code below and should be used
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-; in conjunction with the documentation provided with the complete reference design.
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-; Ken Chapman - Xilinx Ltd
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-; Version v1.00 - 13th July 2006
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;**************************************************************************************
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;Port definitions
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;**************************************************************************************
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;LCD interface ports
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;The master enable signal is not used by the LCD display itself
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;but may be required to confirm that LCD communication is active.
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;This is required on the Spartan-3E Starter Kit if the StrataFLASH
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;is used because it shares the same data pins and conflicts must be avoided.
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_output_port
   OPERAND2-40
    COMMENT-;   LCD character module output data and control
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_E
   OPERAND2-01
    COMMENT-;   active High Enable        E - bit0
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_RW
   OPERAND2-02
    COMMENT-;   Read=1 Write=0           RW - bit1
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_RS
   OPERAND2-04
    COMMENT-;   Instruction=0 Data=1     RS - bit2
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;CONSTANT LCD_drive, 08              ;   Master enable (active High) - bit3
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_DB4
   OPERAND2-10
    COMMENT-;   4-bit              Data DB4 - bit4
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_DB5
   OPERAND2-20
    COMMENT-;   interface          Data DB5 - bit5
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_DB6
   OPERAND2-40
    COMMENT-;                      Data DB6 - bit6
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_DB7
   OPERAND2-80
    COMMENT-;                      Data DB7 - bit7
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_input_port
   OPERAND2-01
    COMMENT-;    LCD character module input data
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_read_DB4
   OPERAND2-10
    COMMENT-;    4-bit           Data DB4 - bit4
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_read_DB5
   OPERAND2-20
    COMMENT-;    interface       Data DB5 - bit5
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_read_DB6
   OPERAND2-40
    COMMENT-;                    Data DB6 - bit6
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-LCD_read_DB7
   OPERAND2-80
    COMMENT-;                    Data DB7 - bit7
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;Control of frequency selection values
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-cursor_position
   OPERAND2-10
    COMMENT-; Pointer to edit position on LCD
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-; ************************
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;Constant to define a software delay of 1us. This must be adjusted to reflect the
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;clock applied to KCPSM3. Every instruction executes in 2 clock cycles making the
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;calculation highly predictable. The '6' in the following equation even allows for
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;'CALL delay_1us' instruction in the initiating code.
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-; delay_1us_constant =  (clock_rate - 6)/4       Where 'clock_rate' is in MHz
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;Example: For a 50MHz clock the constant value is (50-6)/4 = 11  (0B Hex).
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;For clock rates below 10MHz the value of 1 must be used and the operation will
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;become lower than intended.
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-delay_1us_constant
   OPERAND2-0B
    COMMENT-
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;ASCII table
      LABEL-
INSTRUCTION-
   OPERAND1-
   OPERAND2-
    COMMENT-;
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_a
   OPERAND2-61
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_b
   OPERAND2-62
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_c
   OPERAND2-63
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_d
   OPERAND2-64
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_e
   OPERAND2-65
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_f
   OPERAND2-66
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_g
   OPERAND2-67
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_h
   OPERAND2-68
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_i
   OPERAND2-69
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_j
   OPERAND2-6A
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_k
   OPERAND2-6B
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_l
   OPERAND2-6C
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_m
   OPERAND2-6D
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_n
   OPERAND2-6E
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_o
   OPERAND2-6F
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_p
   OPERAND2-70
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_q
   OPERAND2-71
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_r
   OPERAND2-72
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_s
   OPERAND2-73
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_t
   OPERAND2-74
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_u
   OPERAND2-75
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_v
   OPERAND2-76
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_w
   OPERAND2-77
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_x
   OPERAND2-78
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_y
   OPERAND2-79
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_z
   OPERAND2-7A
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_A
   OPERAND2-41
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_B
   OPERAND2-42
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_C
   OPERAND2-43
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_D
   OPERAND2-44
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_E
   OPERAND2-45
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_F
   OPERAND2-46
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_G
   OPERAND2-47
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_H
   OPERAND2-48
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_I
   OPERAND2-49
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_J
   OPERAND2-4A
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_K
   OPERAND2-4B
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_L
   OPERAND2-4C
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_M
   OPERAND2-4D
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_N
   OPERAND2-4E
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_O
   OPERAND2-4F
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_P
   OPERAND2-50
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_Q
   OPERAND2-51
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_R
   OPERAND2-52
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_S
   OPERAND2-53
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_T
   OPERAND2-54
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_U
   OPERAND2-55
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_V
   OPERAND2-56
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_W
   OPERAND2-57
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_X
   OPERAND2-58
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_Y
   OPERAND2-59
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_Z
   OPERAND2-5A
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_0
   OPERAND2-30
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_1
   OPERAND2-31
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_2
   OPERAND2-32
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_3
   OPERAND2-33
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_4
   OPERAND2-34
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_5
   OPERAND2-35
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_6
   OPERAND2-36
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_7
   OPERAND2-37
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_8
   OPERAND2-38
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_9
   OPERAND2-39
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_colon
   OPERAND2-3A
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_stop
   OPERAND2-2E
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_semi_colon
   OPERAND2-3B
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_minus
   OPERAND2-2D
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_divide
   OPERAND2-2F
    COMMENT-;'/'
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_plus
   OPERAND2-2B
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_comma
   OPERAND2-2C
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_less_than
   OPERAND2-3C
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_greater_than
   OPERAND2-3E
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_equals
   OPERAND2-3D
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_space
   OPERAND2-20
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_CR
   OPERAND2-0D
    COMMENT-;carriage return
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_question
   OPERAND2-3F
    COMMENT-;'?'
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_dollar
   OPERAND2-24
    COMMENT-
      LABEL-
INSTRUCTION-CONSTANT
   OPERAND1-character_exclaim
   OPERAND2-21
    COMMENT-;'!'
      LABEL-
INSTRUCTION-CONSTANT