Load DAC by SPI protocol

-- Unit provides serial load of DAC trough SPI 3-wire serial interface

-- It sends 24-bit word, format of the word:

-- 4-bit command: C3-C0, 4x don t care bits, 12-bit data: d11-d0, 4x don t care bits

--

-- Serial interface outputs:

-- SDI - Serial Interface Data sent to DAC

-- SCK - Serial Interface Clock

-- CSLD - Serial Interface Chip Select/Load

--

-- DAC word length = 24 bit:

-- --------------------------

-- MSB

-- 4 bits - DAC command

-- 4 bits - don t care values

-- 12 bits - "gain" word

-- 4 bits - don t care values

-- LSB

-- --------------------------

--

-- Dependencies:

--

-- This unit needs the following files:

-- 1) counter.vhd

-- 2) SEQUENCE.vhd

-- 3) rising.vhd

-- 4) falling.vhd

-- 5) Dline1.vhd

-- 4) useful.vhd

--

-- Revision:

-- Revision 0.01 - File Created

-- Additional Comments:-Load DAC by SPI protocol

-- Unit provides serial load of DAC trough SPI 3-wire serial interface

-- It sends 24-bit word, format of the word:

-- 4-bit command: C3-C0, 4x don t care bits, 12-bit data: d11-d0, 4x don t care bits

--

-- Serial interface outputs:

-- SDI　- Serial Interface Data sent to DAC

-- SCK　- Serial Interface Clock

-- CSLD - Serial Interface Chip Select/Load

--

-- DAC word length = 24 bit:

-- --------------------------

-- MSB

-- 4 bits - DAC command

-- 4 bits - don t care values

-- 12 bits - "gain" word

-- 4 bits - don t care values

-- LSB

-- --------------------------

--

-- Dependencies:

--

-- This unit needs the following files:

-- 1) counter.vhd

-- 2) SEQUENCE.vhd

-- 3) rising.vhd

-- 4) falling.vhd

-- 5) Dline1.vhd

-- 4) useful.vhd

--

-- Revision:

-- Revision 0.01 - File Created

-- Additional Comments: