ex12.vm6

来自「[VHDL经典设计26例]--在xilinx芯片上调试通过--[01--1位全加」· VM6 代码 · 共 662 行 · 第 1/3 页

NDS Database:  version E.38

NDS_INFO | xc9500 | 957284 | XC9572-7-PC84

DEVICE | 9572 | 957284 | 

NETWORK | ex12 | 0 | 0 | 209731591

MACROCELL_INSTANCE | Inv+OptxMapped | N37 | EX12_COPY_0_COPY_0 | 2155872512 | 4 | 2
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<0>.FBK | 704 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<0>.Q | q<0> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<2>.FBK | 705 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<2>.Q | q<2> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<3>.FBK | 706 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<3>.Q | q<3> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<1>.FBK | 703 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<1>.Q | q<1> | 5 | 0 | MC_FBK
OUTPUT_NODE_TYPE | 0 | 0 | MC_Q
NODE | N37 | 621 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | N37.Q | N37 | 0 | 0 | MC_Q
OUTPUT_NODE_TYPE | 1 | 0 | MC_UIM
NODE | N37.UIM | 707 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | N37.Q | N37 | 1 | 0 | MC_UIM

SIGNAL_INSTANCE | N37.SI | N37 | 0 | 4 | 2
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<0>.FBK | 704 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<0>.Q | q<0> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<2>.FBK | 705 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<2>.Q | q<2> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<3>.FBK | 706 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<3>.Q | q<3> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<1>.FBK | 703 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<1>.Q | q<1> | 5 | 0 | MC_FBK
OUTPUT_NODE_TYPE | 1 | 9 | MC_SI_D1
SIGNAL | NODE | N37.D1 | 656 | ? | 0 | 4096 | N37 | NULL | NULL | N37.SI | 1 | 9 | MC_SI_D1
SPPTERM | 0 | IV_ZERO
OUTPUT_NODE_TYPE | 2 | 9 | MC_SI_D2
SIGNAL | NODE | N37.D2 | 657 | ? | 0 | 4096 | N37 | NULL | NULL | N37.SI | 2 | 9 | MC_SI_D2
SPPTERM | 4 | IV_FALSE | q<1>.FBK | IV_FALSE | q<0>.FBK | IV_FALSE | q<2>.FBK | IV_TRUE | q<3>.FBK

SRFF_INSTANCE | N37.REG | N37 | 0 | 1 | 1
INPUT_NODE_TYPE | 0 | 8 | SRFF_D
NODE | N37.D | 655 | ? | 0 | 0 | N37 | NULL | NULL | N37.XOR | 0 | 7 | ALU_F
OUTPUT_NODE_TYPE | 0 | 8 | SRFF_Q
NODE | N37.Q | 658 | ? | 0 | 0 | N37 | NULL | NULL | N37.REG | 0 | 8 | SRFF_Q

INPUT_INSTANCE | 0 | 0 | NULL | N_clk | EX12_COPY_0_COPY_0 | 0 | 1 | 1
INPUT_NODE_TYPE | 0 | 5 | II_IN
NODE | clk | 644 | PI | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | NULL | 0 | 100 | NOTYPE
OUTPUT_NODE_TYPE | 0 | 5 | II_IMUX
NODE | N_clk | 622 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_clk | 0 | 5 | II_IMUX

INPUT_INSTANCE | 0 | 0 | NULL | N_clr | EX12_COPY_0_COPY_0 | 0 | 1 | 1
INPUT_NODE_TYPE | 0 | 5 | II_IN
NODE | clr | 645 | PI | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | NULL | 0 | 100 | NOTYPE
OUTPUT_NODE_TYPE | 0 | 5 | II_IMUX
NODE | N_clr | 623 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_clr | 0 | 5 | II_IMUX

INPUT_INSTANCE | 0 | 0 | NULL | N_din | EX12_COPY_0_COPY_0 | 0 | 1 | 1
INPUT_NODE_TYPE | 0 | 5 | II_IN
NODE | din | 646 | PI | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | NULL | 0 | 100 | NOTYPE
OUTPUT_NODE_TYPE | 0 | 5 | II_IMUX
NODE | N_din | 628 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_din | 0 | 5 | II_IMUX

INPUT_INSTANCE | 0 | 0 | NULL | N_d<1> | EX12_COPY_0_COPY_0 | 0 | 1 | 1
INPUT_NODE_TYPE | 0 | 5 | II_IN
NODE | d<1> | 649 | PI | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | NULL | 0 | 100 | NOTYPE
OUTPUT_NODE_TYPE | 0 | 5 | II_IMUX
NODE | N_d<1> | 631 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<1> | 0 | 5 | II_IMUX

INPUT_INSTANCE | 0 | 0 | NULL | N_d<2> | EX12_COPY_0_COPY_0 | 0 | 1 | 1
INPUT_NODE_TYPE | 0 | 5 | II_IN
NODE | d<2> | 653 | PI | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | NULL | 0 | 100 | NOTYPE
OUTPUT_NODE_TYPE | 0 | 5 | II_IMUX
NODE | N_d<2> | 635 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<2> | 0 | 5 | II_IMUX

INPUT_INSTANCE | 0 | 0 | NULL | N_d<5> | EX12_COPY_0_COPY_0 | 0 | 1 | 1
INPUT_NODE_TYPE | 0 | 5 | II_IN
NODE | d<5> | 651 | PI | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | NULL | 0 | 100 | NOTYPE
OUTPUT_NODE_TYPE | 0 | 5 | II_IMUX
NODE | N_d<5> | 633 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<5> | 0 | 5 | II_IMUX

INPUT_INSTANCE | 0 | 0 | NULL | N_d<6> | EX12_COPY_0_COPY_0 | 0 | 1 | 1
INPUT_NODE_TYPE | 0 | 5 | II_IN
NODE | d<6> | 648 | PI | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | NULL | 0 | 100 | NOTYPE
OUTPUT_NODE_TYPE | 0 | 5 | II_IMUX
NODE | N_d<6> | 630 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<6> | 0 | 5 | II_IMUX

MACROCELL_INSTANCE | PrldLow+OptxMapped+ClkInv | q<1> | EX12_COPY_0_COPY_0 | 2222982144 | 10 | 2
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<0>.FBK | 704 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<0>.Q | q<0> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<2>.FBK | 705 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<2>.Q | q<2> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<3>.FBK | 706 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<3>.Q | q<3> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_din | 628 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_din | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_d<1> | 631 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<1> | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_d<2> | 635 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<2> | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | EXP0_.EXP | 701 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | EXP0_.EXP | EXP0_ | 4 | 0 | MC_EXPORT
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<1>.FBK | 703 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<1>.Q | q<1> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_clk | 622 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_clk | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_clr | 623 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_clr | 0 | 5 | II_IMUX
OUTPUT_NODE_TYPE | 1 | 0 | MC_UIM
NODE | q<1> | 624 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<1>.Q | q<1> | 1 | 0 | MC_UIM
OUTPUT_NODE_TYPE | 5 | 0 | MC_FBK
NODE | q<1>.FBK | 703 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<1>.Q | q<1> | 5 | 0 | MC_FBK

SIGNAL_INSTANCE | q<1>.SI | q<1> | 0 | 10 | 4
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<0>.FBK | 704 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<0>.Q | q<0> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<2>.FBK | 705 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<2>.Q | q<2> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<3>.FBK | 706 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<3>.Q | q<3> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_din | 628 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_din | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_d<1> | 631 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<1> | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_d<2> | 635 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<2> | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | EXP0_.EXP | 701 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | EXP0_.EXP | EXP0_ | 4 | 0 | MC_EXPORT
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<1>.FBK | 703 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<1>.Q | q<1> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_clk | 622 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_clk | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_clr | 623 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_clr | 0 | 5 | II_IMUX
OUTPUT_NODE_TYPE | 1 | 9 | MC_SI_D1
SIGNAL | NODE | q<1>.D1 | 660 | ? | 0 | 4096 | q<1> | NULL | NULL | q<1>.SI | 1 | 9 | MC_SI_D1
SPPTERM | 0 | IV_ZERO
OUTPUT_NODE_TYPE | 2 | 9 | MC_SI_D2
SIGNAL | NODE | q<1>.D2 | 661 | ? | 0 | 4096 | q<1> | NULL | NULL | q<1>.SI | 2 | 9 | MC_SI_D2
SPPTERM | 1 | IV_TRUE | EXP0_.EXP
SPPTERM | 6 | IV_TRUE | N_din | IV_TRUE | N_d<1> | IV_TRUE | q<1>.FBK | IV_FALSE | q<0>.FBK | IV_TRUE | q<2>.FBK | IV_FALSE | q<3>.FBK
SPPTERM | 6 | IV_TRUE | N_din | IV_TRUE | N_d<2> | IV_FALSE | q<1>.FBK | IV_TRUE | q<0>.FBK | IV_TRUE | q<2>.FBK | IV_FALSE | q<3>.FBK
SPPTERM | 6 | IV_FALSE | N_din | IV_FALSE | N_d<1> | IV_TRUE | q<1>.FBK | IV_FALSE | q<0>.FBK | IV_TRUE | q<2>.FBK | IV_FALSE | q<3>.FBK
OUTPUT_NODE_TYPE | 3 | 9 | MC_SI_CLKF
SIGNAL | NODE | q<1>.CLKF | 662 | ? | 0 | 4096 | q<1> | NULL | NULL | q<1>.SI | 3 | 9 | MC_SI_CLKF
SPPTERM | 1 | IV_TRUE | N_clk
OUTPUT_NODE_TYPE | 6 | 9 | MC_SI_RSTF
SIGNAL | NODE | q<1>.RSTF | 663 | ? | 0 | 4096 | q<1> | NULL | NULL | q<1>.SI | 6 | 9 | MC_SI_RSTF
SPPTERM | 1 | IV_TRUE | N_clr

SRFF_INSTANCE | q<1>.REG | q<1> | 0 | 3 | 1
INPUT_NODE_TYPE | 0 | 8 | SRFF_D
NODE | q<1>.D | 659 | ? | 0 | 0 | q<1> | NULL | NULL | q<1>.XOR | 0 | 7 | ALU_F
INPUT_NODE_TYPE | 1 | 8 | SRFF_C
SIGNAL | NODE | q<1>.CLKF | 662 | ? | 0 | 4096 | q<1> | NULL | NULL | q<1>.SI | 3 | 9 | MC_SI_CLKF
SPPTERM | 1 | IV_TRUE | N_clk
INPUT_NODE_TYPE | 3 | 8 | SRFF_R
SIGNAL | NODE | q<1>.RSTF | 663 | ? | 0 | 4096 | q<1> | NULL | NULL | q<1>.SI | 6 | 9 | MC_SI_RSTF
SPPTERM | 1 | IV_TRUE | N_clr
OUTPUT_NODE_TYPE | 0 | 8 | SRFF_Q
NODE | q<1>.Q | 664 | ? | 0 | 0 | q<1> | NULL | NULL | q<1>.REG | 0 | 8 | SRFF_Q

INPUT_INSTANCE | 0 | 0 | NULL | N_d<3> | EX12_COPY_0_COPY_0 | 0 | 1 | 1
INPUT_NODE_TYPE | 0 | 5 | II_IN
NODE | d<3> | 650 | PI | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | NULL | 0 | 100 | NOTYPE
OUTPUT_NODE_TYPE | 0 | 5 | II_IMUX
NODE | N_d<3> | 632 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<3> | 0 | 5 | II_IMUX

INPUT_INSTANCE | 0 | 0 | NULL | N_d<7> | EX12_COPY_0_COPY_0 | 0 | 1 | 1
INPUT_NODE_TYPE | 0 | 5 | II_IN
NODE | d<7> | 647 | PI | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | NULL | 0 | 100 | NOTYPE
OUTPUT_NODE_TYPE | 0 | 5 | II_IMUX
NODE | N_d<7> | 629 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<7> | 0 | 5 | II_IMUX

MACROCELL_INSTANCE | PrldLow+OptxMapped+ClkInv | q<0> | EX12_COPY_0_COPY_0 | 2222982144 | 10 | 2
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<0>.FBK | 704 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<0>.Q | q<0> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<2>.FBK | 705 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<2>.Q | q<2> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<3>.FBK | 706 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<3>.Q | q<3> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_din | 628 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_din | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_d<1> | 631 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<1> | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_d<3> | 632 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<3> | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | EXP1_.EXP | 702 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | EXP1_.EXP | EXP1_ | 4 | 0 | MC_EXPORT
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<1>.FBK | 703 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<1>.Q | q<1> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_clk | 622 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_clk | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_clr | 623 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_clr | 0 | 5 | II_IMUX
OUTPUT_NODE_TYPE | 1 | 0 | MC_UIM
NODE | q<0> | 625 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<0>.Q | q<0> | 1 | 0 | MC_UIM
OUTPUT_NODE_TYPE | 5 | 0 | MC_FBK
NODE | q<0>.FBK | 704 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<0>.Q | q<0> | 5 | 0 | MC_FBK

SIGNAL_INSTANCE | q<0>.SI | q<0> | 0 | 10 | 4
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<0>.FBK | 704 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<0>.Q | q<0> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<2>.FBK | 705 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<2>.Q | q<2> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<3>.FBK | 706 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<3>.Q | q<3> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_din | 628 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_din | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_d<1> | 631 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<1> | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_d<3> | 632 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_d<3> | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | EXP1_.EXP | 702 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | EXP1_.EXP | EXP1_ | 4 | 0 | MC_EXPORT
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | q<1>.FBK | 703 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | q<1>.Q | q<1> | 5 | 0 | MC_FBK
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_clk | 622 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_clk | 0 | 5 | II_IMUX
INPUT_NODE_TYPE | 1 | 100 | NOTYPE
NODE | N_clr | 623 | ? | 0 | 0 | EX12_COPY_0_COPY_0 | NULL | NULL | N_clr | 0 | 5 | II_IMUX
OUTPUT_NODE_TYPE | 1 | 9 | MC_SI_D1