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Dependencies: C12832_lcd USBDevice mbed-rtos mbed mmSPI-2 watchdog
Fork of
USB_device_project
by 
Mike Moore
Diff: mmRTL/reg_16.txt
- Revision:
- 3:659ffc90b59e
- Child:
- 7:d1aca9ccbab8
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mmRTL/reg_16.txt Sun Sep 01 02:53:39 2013 +0000
@@ -0,0 +1,71 @@
+/*----------------------------------copyright---------------------------------*/
+// licensed for personal and academic use.
+// commercial use must be approved by the account-holder of
+// gated.clock@gmail.com
+/*-----------------------------------module-----------------------------------*/
+ module reg_16
+ (
+ oParallel, // parallel-output data.
+ iParallel1, // parallel-input data.
+ iParallel0, // parallel-input data.
+ iSel, // select the parallel input.
+ oSerial, // serial-output data.
+ iSerial, // serial-input data.
+ iLoadEnable, // parallel-load-enable.
+ iShiftEnable, // serial-shift-enable.
+ iResetN, // synchronous reset*.
+ iClk // module clock.
+ );
+/*--------------------------------description-----------------------------------
+ a 16-bit parallel shift-register with 2 selectable input buses.
+-------------------------------------notes--------------------------------------
+ shifting is LSB->MSB.
+------------------------------------defines-----------------------------------*/
+/*-----------------------------------ports------------------------------------*/
+ output [15:0] oParallel; // parallel-output data.
+ input [15:0] iParallel1; // parallel-input data.
+ input [15:0] iParallel0; // parallel-input data.
+ input iSel; // select the parallel input.
+ output oSerial; // serial-output data.
+ input iSerial; // serial-input data.
+ input iLoadEnable; // parallel-load-enable.
+ input iShiftEnable; // serial-shift-enable.
+ input iResetN; // synchronous reset*.
+ input iClk; // module clock.
+/*-----------------------------------wires------------------------------------*/
+ wire [15:0] oParallel; // parallel-output data.
+ wire [15:0] iParallel1; // parallel-input data.
+ wire [15:0] iParallel0; // parallel-input data.
+ wire iSel; // select the parallel input.
+ wire [15:0] wParallelIn; // select the parallel input.
+ wire oSerial; // serial-output data.
+ wire iSerial; // serial-input data.
+ wire iLoadEnable; // parallel-load-enable.
+ wire iShiftEnable; // serial-shift-enable.
+ wire iResetN; // synchronous reset*.
+ wire iClk; // module clock.
+/*---------------------------------registers----------------------------------*/
+ reg [15:0] rRegister; // the register.
+/*---------------------------------variables----------------------------------*/
+/*---------------------------------parameters---------------------------------*/
+/*-----------------------------------clocks-----------------------------------*/
+/*---------------------------------instances----------------------------------*/
+ mux16x2 U0_mux16x2 // data-input selection.
+ (
+ .iDin1(iParallel1),
+ .iDin0(iParallel0),
+ .iSel (iSel),
+ .oDout(wParallelIn)
+ );
+/*-----------------------------------logic------------------------------------*/
+ always @ (posedge iClk or negedge iResetN)
+ begin
+ if (!iResetN) rRegister <= 16'h0000;
+ else if (iLoadEnable) rRegister <= wParallelIn;
+ else if (iShiftEnable) rRegister <= {rRegister[14:0], iSerial};
+ else rRegister <= rRegister;
+ end
+
+ assign oParallel = rRegister; // propagate parallel-out.
+ assign oSerial = rRegister[15]; // propagate serial-out.
+/*-------------------------------*/endmodule/*--------------------------------*/