Serial in serial out

At each clock cycle, the content of the register shifts to the right and sin enters into the leftmost bit or the MSB bit. The whole design also has and output that we are c calling sout. At each clock cyccle the right most bit of the register comes out. The picture shows the scheme of the shift register. Here is the verilog implemmentation of. The testbech for the Serial shift register Serial Input Serial Output Shift Register Exercizes 1. In test bench the shift register is instantiated with N=2. Verify that it behaves as expected. Repead the testbench and verification for N=4 2. Write the above code for left shift in place of right shift. The data now comes out of the MSB.

// File : Design of Serial In -
Serial Out Shift Register using d_flip
flop.v
module siso ( din ,clk ,reset ,dout );
output dout ;
input din ;
input clk ;
input reset ;
wire [2:0]s;
d_flip_flop u0 (.din(din),
.clk(clk),
.reset(reset),
.dout(s[0]));
d_flip_flop u1 (.din(s[0]),
.clk(clk),
.reset(reset),
.dout(s[1]));
d_flip_flop u2 (.din(s[1]),
.clk(clk),
.reset(reset),
.dout(s[2]));
d_flip_flop u3 (.din(s[2]),
.clk(clk),
.reset(reset),
.dout(dout));
endmodule
// -------------- D flip flop design -
-----------------------
//------------------------------
--------------------------------
---------------
//
// Title : d_flip_flop
// Design : upload_design1
// Author : Naresh Singh Dobal
// Company : nsd
//
//------------------------------
--------------------------------
---------------
//
// File : d_flip_flop.v
module d_flip_flop ( din ,clk ,reset
,dout );
output dout ;
reg dout;
input din ;
input clk ;
input reset ;
always @ (posedge clk)
begin
if (reset)
dout <= 1;
else
dout <= din;
end
endmodule

Serial in parallel out

// File : Serial IN Parallel OUT
Shift Register using Behavior
Modeling Style.v
module SIPO ( din ,clk ,reset ,dout );
output [3:0] dout ;
wire [3:0] dout ;
input din ;
wire din ;
input clk ;
wire clk ;
input reset ;
wire reset ;
reg [3:0]s;
always @ (posedge (clk)) begin
if (reset)
s <= 0;
else begin
s[3] <= din;
s[2] <= s[3];
s[1] <= s[2];
s[0] <= s[1];
end
end
assign dout = s;
endmodule

Parallel in parallel out

// File : parallel IN - Parallel
OUT Shift Register using Behavior
Modeling Style.v
module PIPO ( din ,clk ,reset ,dout );
output [3:0] dout ;
reg [3:0] dout ;
input [3:0] din ;
wire [3:0] din ;
input clk ;
wire clk ;
input reset ;
wire reset ;
always @ (posedge (clk)) begin
if (reset)
dout <= 0;
else
dout <= din;
end
endmodule

Parallel in serial out

// File : Parallel IN - Serial OUT
Shift Register.v
module parallel_in_serial_out ( din
,clk ,reset ,load ,dout );
output dout ;
reg dout ;
input [3:0] din ;
wire [3:0] din ;
input clk ;
wire clk ;
input reset ;
wire reset ;
input load ;
wire load ;
reg [3:0]temp;
always @ (posedge (clk)) begin
if (reset)
temp <= 1;
else if (load)
temp <= din;
else begin
dout <= temp[3];
temp <= {temp[2:0],1'b0};
end
end
endmodule

Ct4810 driver win7. 8-bit parallel-in/serial-out shift register

The 74LV165 is an 8-bit parallel-load or serial-in shift register with complementary serial outputs (Q7 and Q7) available from the last stage. When the parallel-load input (PL) is LOW, parallel data from the inputs D0 to D7 are loaded into the register asynchronously. When input PL is HIGH, data enters the register serially at the input DS. It shifts one place to the right (Q0→Q1→Q2, etc.) with each positive-going clock transition. This feature allows parallel-to-serial converter expansion by tying the output Q7 to the input DS of the succeeding stage.

4 Bit Shift Register Verilog

The clock input is a gate-OR structure which allows one input to be used as an active LOW clock enable input (CE) input. The pin assignment for the inputs CP and CE is arbitrary and can be reversed for layout convenience. The LOW-to-HIGH transition of the input CE should only take place while CP HIGH for predictable operation. Either the CP or the CE should be HIGH before the LOW-to-HIGH transition of PL to prevent shifting the data when PL is activated.

Features and benefits

• Wide supply voltage range from 1.0 V to 5.5 V
• Synchronous parallel-to-serial applications
• Optimized for low voltage applications: 1.0 V to 3.6 V
• Synchronous serial input for easy expansion
• Latch-up performance exceeds 250 mA
• 5.5 V tolerant inputs/outputs
• Direct interface with TTL levels (2.7 V to 3.6 V)
• Power-down mode
• Complies with JEDEC standards:
  • JESD8-5 (2.3 V to 2.7 V)
  • JESD8B/JESD36 (2.7 V to 3.6 V)
  • JESD8-1A (4.5 V to 5.5 V)
• ESD protection:
  • HBM JESD22-A114-A exceeds 2000 V
  • MM JESD22-A115-A exceeds 200 V
• Specified from -40°C to +85°C and from -40°C to +125°C

Parametrics

Type number	VCC (V)	Logic switching levels	Output drive capability (mA)	tpd (ns)	fmax (MHz)	No of bits	Tamb (°C)	Rth(j-c) (K/W)
74LV165D	Production	1.0 - 5.5	TTL	± 12	18	78	8	low	-40~125	91	9.3	51	SO16
74LV165DB NRND	Not for design in	SSOP16
74LV165PW	Production	1.0 - 5.5	TTL	± 12	18	78	8	low	-40~125	120	3.3	48.7	TSSOP16

Package

Package	Package information	Reflow-/Wave soldering	Status
74LV165D	SO16 (SOT109-1)	SOT109-1	SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13' Q1/T1	Active	74LV165D	74LV165D,118 (9351 560 60118)
				Bulk Pack	Active	74LV165D	74LV165D,112 (9351 560 60112)
74LV165DB NRND	SSOP16 (SOT338-1)	SOT338-1	SSOP-TSSOP-VSO-REFLOW SSOP-TSSOP-VSO-WAVE	Reel 13' Q1/T1	Active	LV165	74LV165DB,118 (9351 660 30118)
				Bulk Pack	Active	LV165	74LV165DB,112 (9351 660 30112)
74LV165PW	TSSOP16 (SOT403-1)	SOT403-1	SSOP-TSSOP-VSO-WAVE	Reel 13' Q1/T1	Active	LV165	74LV165PW,118 (9351 745 40118)
				Bulk Pack	Active	LV165	74LV165PW,112 (9351 745 40112)

Quality, reliability & chemical content

Leadfree conversion date
74LV165D	74LV165D,118	74LV165D	week 6, 2004	144.9	10.23	9.78E7	1	1
74LV165D	74LV165D,112	74LV165D	week 6, 2004	144.9	10.23	9.78E7	1	1
74LV165DB NRND	74LV165DB,118	74LV165DB	week 12, 2005	1	1
74LV165DB NRND	74LV165DB,112	74LV165DB	week 12, 2005	1	1
74LV165PW	74LV165PW,118	74LV165PW	week 17, 2005	144.9	10.23	9.78E7	1	1
74LV165PW	74LV165PW,112	74LV165PW	week 17, 2005	144.9	10.23	9.78E7	1	1

Quality and reliability disclaimer

Documentation (10)

File name	Title	Type	Date
74LV165	8-bit parallel-in/serial-out shift register	Data sheet	2017-03-17
Nexperia_Selection_guide_2020	Nexperia Selection Guide 2020	Selection guide	2020-01-31
SO-SOJ-REFLOW	Footprint for reflow soldering	Reflow soldering	2009-10-08
SO-SOJ-WAVE	Footprint for wave soldering	Wave soldering	2009-10-08
SOT109-1	plastic, small outline package; 16 leads; 1.27 mm pitch; 9.9 mm x 3.9 mm x 1.35 mm body	Package information	2020-04-21
SSOP-TSSOP-VSO-WAVE	Footprint for wave soldering	Wave soldering	2009-10-08
SOT403-1	plastic, thin shrink small outline package; 16 leads; 5 mm x 4.4 mm x 1.1 mm body	Package information	2020-04-21
SSOP-TSSOP-VSO-REFLOW	Footprint for reflow soldering	Reflow soldering	2009-10-08
SSOP-TSSOP-VSO-WAVE	Footprint for wave soldering	Wave soldering	2009-10-08
SOT338-1	plastic, shrink small outline package; 16 leads; 0.65 mm pitch; 6.2 mm x 5.3 mm x 2 mm body	Package information	2020-04-21

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