de2_clock.fit.eqn

适合DE2板

--DATA_BUS_VALUE[7] is DATA_BUS_VALUE[7] at LCFF_X1_Y27_N25
DATA_BUS_VALUE[7] = DFFEAS(A1L962, GLOBAL(A1L57), !GLOBAL(A1L522),  ,  ,  ,  ,  ,  );


--state.mode_set is state.mode_set at LCFF_X1_Y27_N15
state.mode_set = DFFEAS(A1L313, GLOBAL(A1L57), !GLOBAL(A1L522),  ,  ,  ,  ,  ,  );


--state.return_home is state.return_home at LCFF_X1_Y27_N7
state.return_home = DFFEAS(A1L413, GLOBAL(A1L57), !GLOBAL(A1L522),  ,  ,  ,  ,  ,  );


--A1L232 is Select~1607 at LCCOMB_X1_Y27_N2
A1L232 = !state.mode_set & !state.return_home;


--A1L332 is Select~1608 at LCCOMB_X2_Y27_N4
A1L332 = state.write_char1 # next_command.write_char2 & (state.hold # state.toggle_e);


--A1L432 is Select~1609 at LCCOMB_X2_Y27_N24
A1L432 = state.write_char9 # next_command.write_char10 & (state.toggle_e # state.hold);


--A1L532 is Select~1610 at LCCOMB_X2_Y27_N20
A1L532 = state.write_char3 # next_command.write_char4 & (state.hold # state.toggle_e);


--A1L632 is Select~1611 at LCCOMB_X1_Y26_N16
A1L632 = state.write_char4 # next_command.write_char5 & (state.toggle_e # state.hold);


--A1L732 is Select~1612 at LCCOMB_X1_Y26_N22
A1L732 = state.write_char6 # next_command.write_char7 & (state.toggle_e # state.hold);


--A1L832 is Select~1613 at LCCOMB_X1_Y26_N26
A1L832 = state.write_char7 # next_command.write_char8 & (state.hold # state.toggle_e);


--A1L932 is Select~1614 at LCCOMB_X2_Y27_N22
A1L932 = state.write_char2 # next_command.write_char3 & (state.hold # state.toggle_e);


--A1L042 is Select~1615 at LCCOMB_X1_Y26_N14
A1L042 = state.write_char5 # next_command.write_char6 & (state.hold # state.toggle_e);


--A1L142 is Select~1616 at LCCOMB_X1_Y26_N2
A1L142 = state.write_char8 # next_command.write_char9 & (state.toggle_e # state.hold);


--CLK_COUNT_400HZ[1] is CLK_COUNT_400HZ[1] at LCFF_X47_Y4_N15
CLK_COUNT_400HZ[1] = DFFEAS(A1L701, GLOBAL(A1L27),  ,  ,  ,  ,  , A1L501,  );


--CLK_COUNT_400HZ[0] is CLK_COUNT_400HZ[0] at LCFF_X47_Y4_N13
CLK_COUNT_400HZ[0] = DFFEAS(A1L301, GLOBAL(A1L27),  ,  ,  ,  ,  , A1L501,  );


--A1L301 is CLK_COUNT_400HZ[0]~339 at LCCOMB_X47_Y4_N12
A1L301 = CLK_COUNT_400HZ[0] $ VCC;

--A1L401 is CLK_COUNT_400HZ[0]~340 at LCCOMB_X47_Y4_N12
A1L401 = CARRY(CLK_COUNT_400HZ[0]);


--A1L701 is CLK_COUNT_400HZ[1]~341 at LCCOMB_X47_Y4_N14
A1L701 = CLK_COUNT_400HZ[1] & !A1L401 # !CLK_COUNT_400HZ[1] & (A1L401 # GND);

--A1L801 is CLK_COUNT_400HZ[1]~342 at LCCOMB_X47_Y4_N14
A1L801 = CARRY(!A1L401 # !CLK_COUNT_400HZ[1]);


--A1L011 is CLK_COUNT_400HZ[2]~343 at LCCOMB_X47_Y4_N16
A1L011 = CLK_COUNT_400HZ[2] & (A1L801 $ GND) # !CLK_COUNT_400HZ[2] & !A1L801 & VCC;

--A1L111 is CLK_COUNT_400HZ[2]~344 at LCCOMB_X47_Y4_N16
A1L111 = CARRY(CLK_COUNT_400HZ[2] & !A1L801);


--A1L311 is CLK_COUNT_400HZ[3]~345 at LCCOMB_X47_Y4_N18
A1L311 = CLK_COUNT_400HZ[3] & !A1L111 # !CLK_COUNT_400HZ[3] & (A1L111 # GND);

--A1L411 is CLK_COUNT_400HZ[3]~346 at LCCOMB_X47_Y4_N18
A1L411 = CARRY(!A1L111 # !CLK_COUNT_400HZ[3]);


--A1L611 is CLK_COUNT_400HZ[4]~347 at LCCOMB_X47_Y4_N20
A1L611 = CLK_COUNT_400HZ[4] & (A1L411 $ GND) # !CLK_COUNT_400HZ[4] & !A1L411 & VCC;

--A1L711 is CLK_COUNT_400HZ[4]~348 at LCCOMB_X47_Y4_N20
A1L711 = CARRY(CLK_COUNT_400HZ[4] & !A1L411);


--A1L911 is CLK_COUNT_400HZ[5]~349 at LCCOMB_X47_Y4_N22
A1L911 = CLK_COUNT_400HZ[5] & !A1L711 # !CLK_COUNT_400HZ[5] & (A1L711 # GND);

--A1L021 is CLK_COUNT_400HZ[5]~350 at LCCOMB_X47_Y4_N22
A1L021 = CARRY(!A1L711 # !CLK_COUNT_400HZ[5]);


--A1L221 is CLK_COUNT_400HZ[6]~351 at LCCOMB_X47_Y4_N24
A1L221 = CLK_COUNT_400HZ[6] & (A1L021 $ GND) # !CLK_COUNT_400HZ[6] & !A1L021 & VCC;

--A1L321 is CLK_COUNT_400HZ[6]~352 at LCCOMB_X47_Y4_N24
A1L321 = CARRY(CLK_COUNT_400HZ[6] & !A1L021);


--A1L521 is CLK_COUNT_400HZ[7]~353 at LCCOMB_X47_Y4_N26
A1L521 = CLK_COUNT_400HZ[7] & !A1L321 # !CLK_COUNT_400HZ[7] & (A1L321 # GND);

--A1L621 is CLK_COUNT_400HZ[7]~354 at LCCOMB_X47_Y4_N26
A1L621 = CARRY(!A1L321 # !CLK_COUNT_400HZ[7]);


--A1L821 is CLK_COUNT_400HZ[8]~355 at LCCOMB_X47_Y4_N28
A1L821 = CLK_COUNT_400HZ[8] & (A1L621 $ GND) # !CLK_COUNT_400HZ[8] & !A1L621 & VCC;

--A1L921 is CLK_COUNT_400HZ[8]~356 at LCCOMB_X47_Y4_N28
A1L921 = CARRY(CLK_COUNT_400HZ[8] & !A1L621);


--A1L131 is CLK_COUNT_400HZ[9]~357 at LCCOMB_X47_Y4_N30
A1L131 = CLK_COUNT_400HZ[9] & !A1L921 # !CLK_COUNT_400HZ[9] & (A1L921 # GND);

--A1L231 is CLK_COUNT_400HZ[9]~358 at LCCOMB_X47_Y4_N30
A1L231 = CARRY(!A1L921 # !CLK_COUNT_400HZ[9]);


--A1L431 is CLK_COUNT_400HZ[10]~359 at LCCOMB_X47_Y3_N0
A1L431 = CLK_COUNT_400HZ[10] & (A1L231 $ GND) # !CLK_COUNT_400HZ[10] & !A1L231 & VCC;

--A1L531 is CLK_COUNT_400HZ[10]~360 at LCCOMB_X47_Y3_N0
A1L531 = CARRY(CLK_COUNT_400HZ[10] & !A1L231);


--A1L731 is CLK_COUNT_400HZ[11]~361 at LCCOMB_X47_Y3_N2
A1L731 = CLK_COUNT_400HZ[11] & !A1L531 # !CLK_COUNT_400HZ[11] & (A1L531 # GND);

--A1L831 is CLK_COUNT_400HZ[11]~362 at LCCOMB_X47_Y3_N2
A1L831 = CARRY(!A1L531 # !CLK_COUNT_400HZ[11]);


--A1L041 is CLK_COUNT_400HZ[12]~363 at LCCOMB_X47_Y3_N4
A1L041 = CLK_COUNT_400HZ[12] & (A1L831 $ GND) # !CLK_COUNT_400HZ[12] & !A1L831 & VCC;

--A1L141 is CLK_COUNT_400HZ[12]~364 at LCCOMB_X47_Y3_N4
A1L141 = CARRY(CLK_COUNT_400HZ[12] & !A1L831);


--A1L341 is CLK_COUNT_400HZ[13]~365 at LCCOMB_X47_Y3_N6
A1L341 = CLK_COUNT_400HZ[13] & !A1L141 # !CLK_COUNT_400HZ[13] & (A1L141 # GND);

--A1L441 is CLK_COUNT_400HZ[13]~366 at LCCOMB_X47_Y3_N6
A1L441 = CARRY(!A1L141 # !CLK_COUNT_400HZ[13]);


--A1L641 is CLK_COUNT_400HZ[14]~367 at LCCOMB_X47_Y3_N8
A1L641 = CLK_COUNT_400HZ[14] & (A1L441 $ GND) # !CLK_COUNT_400HZ[14] & !A1L441 & VCC;

--A1L741 is CLK_COUNT_400HZ[14]~368 at LCCOMB_X47_Y3_N8
A1L741 = CARRY(CLK_COUNT_400HZ[14] & !A1L441);


--A1L941 is CLK_COUNT_400HZ[15]~369 at LCCOMB_X47_Y3_N10
A1L941 = CLK_COUNT_400HZ[15] & !A1L741 # !CLK_COUNT_400HZ[15] & (A1L741 # GND);

--A1L051 is CLK_COUNT_400HZ[15]~370 at LCCOMB_X47_Y3_N10
A1L051 = CARRY(!A1L741 # !CLK_COUNT_400HZ[15]);


--A1L251 is CLK_COUNT_400HZ[16]~371 at LCCOMB_X47_Y3_N12
A1L251 = CLK_COUNT_400HZ[16] & (A1L051 $ GND) # !CLK_COUNT_400HZ[16] & !A1L051 & VCC;

--A1L351 is CLK_COUNT_400HZ[16]~372 at LCCOMB_X47_Y3_N12
A1L351 = CARRY(CLK_COUNT_400HZ[16] & !A1L051);


--A1L501 is CLK_COUNT_400HZ[0]~373 at LCCOMB_X47_Y3_N24
A1L501 = !A1L391 # !reset;


--A1L551 is CLK_COUNT_400HZ[17]~374 at LCCOMB_X47_Y3_N14
A1L551 = CLK_COUNT_400HZ[17] & !A1L351 # !CLK_COUNT_400HZ[17] & (A1L351 # GND);

--A1L651 is CLK_COUNT_400HZ[17]~375 at LCCOMB_X47_Y3_N14
A1L651 = CARRY(!A1L351 # !CLK_COUNT_400HZ[17]);


--A1L851 is CLK_COUNT_400HZ[18]~376 at LCCOMB_X47_Y3_N16
A1L851 = CLK_COUNT_400HZ[18] & (A1L651 $ GND) # !CLK_COUNT_400HZ[18] & !A1L651 & VCC;

--A1L951 is CLK_COUNT_400HZ[18]~377 at LCCOMB_X47_Y3_N16
A1L951 = CARRY(CLK_COUNT_400HZ[18] & !A1L651);


--A1L161 is CLK_COUNT_400HZ[19]~378 at LCCOMB_X47_Y3_N18
A1L161 = A1L951 $ CLK_COUNT_400HZ[19];


--A1L87 is CLK_COUNT_10HZ[0]~112 at LCCOMB_X45_Y3_N12
A1L87 = CLK_COUNT_10HZ[0] $ VCC;

--A1L97 is CLK_COUNT_10HZ[0]~113 at LCCOMB_X45_Y3_N12
A1L97 = CARRY(CLK_COUNT_10HZ[0]);


--A1L18 is CLK_COUNT_10HZ[1]~114 at LCCOMB_X45_Y3_N14
A1L18 = CLK_COUNT_10HZ[1] & !A1L97 # !CLK_COUNT_10HZ[1] & (A1L97 # GND);

--A1L28 is CLK_COUNT_10HZ[1]~115 at LCCOMB_X45_Y3_N14
A1L28 = CARRY(!A1L97 # !CLK_COUNT_10HZ[1]);


--A1L48 is CLK_COUNT_10HZ[2]~116 at LCCOMB_X45_Y3_N16
A1L48 = CLK_COUNT_10HZ[2] & (A1L28 $ GND) # !CLK_COUNT_10HZ[2] & !A1L28 & VCC;

--A1L58 is CLK_COUNT_10HZ[2]~117 at LCCOMB_X45_Y3_N16
A1L58 = CARRY(CLK_COUNT_10HZ[2] & !A1L28);


--A1L78 is CLK_COUNT_10HZ[3]~118 at LCCOMB_X45_Y3_N18
A1L78 = CLK_COUNT_10HZ[3] & !A1L58 # !CLK_COUNT_10HZ[3] & (A1L58 # GND);

--A1L88 is CLK_COUNT_10HZ[3]~119 at LCCOMB_X45_Y3_N18
A1L88 = CARRY(!A1L58 # !CLK_COUNT_10HZ[3]);


--A1L09 is CLK_COUNT_10HZ[4]~120 at LCCOMB_X45_Y3_N20
A1L09 = CLK_COUNT_10HZ[4] & (A1L88 $ GND) # !CLK_COUNT_10HZ[4] & !A1L88 & VCC;

--A1L19 is CLK_COUNT_10HZ[4]~121 at LCCOMB_X45_Y3_N20
A1L19 = CARRY(CLK_COUNT_10HZ[4] & !A1L88);


--A1L39 is CLK_COUNT_10HZ[5]~122 at LCCOMB_X45_Y3_N22
A1L39 = CLK_COUNT_10HZ[5] & !A1L19 # !CLK_COUNT_10HZ[5] & (A1L19 # GND);

--A1L49 is CLK_COUNT_10HZ[5]~123 at LCCOMB_X45_Y3_N22
A1L49 = CARRY(!A1L19 # !CLK_COUNT_10HZ[5]);


--A1L69 is CLK_COUNT_10HZ[6]~124 at LCCOMB_X45_Y3_N24
A1L69 = CLK_COUNT_10HZ[6] & (A1L49 $ GND) # !CLK_COUNT_10HZ[6] & !A1L49 & VCC;

--A1L79 is CLK_COUNT_10HZ[6]~125 at LCCOMB_X45_Y3_N24
A1L79 = CARRY(CLK_COUNT_10HZ[6] & !A1L49);


--A1L99 is CLK_COUNT_10HZ[7]~126 at LCCOMB_X45_Y3_N26
A1L99 = A1L79 $ CLK_COUNT_10HZ[7];


--BCD_MIND0[0] is BCD_MIND0[0] at LCFF_X2_Y24_N1
BCD_MIND0[0] = DFFEAS(A1L92, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L52,  ,  ,  ,  );


--BCD_HRD0[0] is BCD_HRD0[0] at LCFF_X3_Y25_N31
BCD_HRD0[0] = DFFEAS(A1L9, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L2,  ,  ,  ,  );


--A1L242 is Select~1617 at LCCOMB_X2_Y25_N12
A1L242 = state.write_char5 & (BCD_MIND0[0] # state.write_char2 & BCD_HRD0[0]) # !state.write_char5 & (state.write_char2 & BCD_HRD0[0]);


--BCD_MIND1[0] is BCD_MIND1[0] at LCFF_X3_Y26_N23
BCD_MIND1[0] = DFFEAS(A1L83, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L53,  ,  ,  ,  );


--A1L342 is Select~1618 at LCCOMB_X2_Y25_N28
A1L342 = BCD_MIND1[0] & (state.write_char4 # BCD_TSEC[0] & state.write_char10) # !BCD_MIND1[0] & (BCD_TSEC[0] & state.write_char10);


--BCD_SECD1[0] is BCD_SECD1[0] at LCFF_X2_Y25_N21
BCD_SECD1[0] = DFFEAS(A1L55, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L25,  ,  ,  ,  );


--A1L442 is Select~1619 at LCCOMB_X2_Y25_N22
A1L442 = BCD_SECD1[0] & (state.write_char7 # state.write_char8 & BCD_SECD0[0]) # !BCD_SECD1[0] & (state.write_char8 & BCD_SECD0[0]);


--state.display_clear is state.display_clear at LCFF_X1_Y27_N19
state.display_clear = DFFEAS(A1L513, GLOBAL(A1L57), !GLOBAL(A1L522),  ,  ,  ,  ,  ,  );


--A1L542 is Select~1620 at LCCOMB_X2_Y25_N26
A1L542 = state.display_clear # A1L442 # DATA_BUS_VALUE[0] & !A1L481;


--BCD_HRD1[0] is BCD_HRD1[0] at LCFF_X3_Y25_N27
BCD_HRD1[0] = DFFEAS(A1L51, GLOBAL(A1L07), !GLOBAL(A1L522),  ,  ,  ,  ,  ,  );


--A1L642 is Select~1621 at LCCOMB_X2_Y25_N2
A1L642 = BCD_HRD1[0] & state.write_char1;


--A1L742 is Select~1622 at LCCOMB_X2_Y25_N4
A1L742 = A1L242 # A1L542 # A1L642 # A1L342;


--BCD_HRD1[1] is BCD_HRD1[1] at LCFF_X3_Y25_N21
BCD_HRD1[1] = DFFEAS(A1L71, GLOBAL(A1L07), !GLOBAL(A1L522),  ,  ,  ,  ,  ,  );


--A1L842 is Select~1623 at LCCOMB_X2_Y26_N12
A1L842 = state.write_char1 & (BCD_HRD1[1] # state.write_char8 & BCD_SECD0[1]) # !state.write_char1 & state.write_char8 & (BCD_SECD0[1]);


--BCD_MIND1[1] is BCD_MIND1[1] at LCFF_X3_Y26_N19
BCD_MIND1[1] = DFFEAS(A1L93, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L53,  ,  ,  ,  );


--BCD_HRD0[1] is BCD_HRD0[1] at LCFF_X3_Y25_N29
BCD_HRD0[1] = DFFEAS(A1L01, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L2,  ,  ,  ,  );


--A1L942 is Select~1624 at LCCOMB_X2_Y26_N4
A1L942 = state.write_char2 & (BCD_HRD0[1] # state.write_char4 & BCD_MIND1[1]) # !state.write_char2 & (state.write_char4 & BCD_MIND1[1]);


--BCD_SECD1[1] is BCD_SECD1[1] at LCFF_X1_Y24_N1
BCD_SECD1[1] = DFFEAS(A1L65, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L25,  ,  ,  ,  );


--BCD_MIND0[1] is BCD_MIND0[1] at LCFF_X2_Y24_N3
BCD_MIND0[1] = DFFEAS(A1L03, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L52,  ,  ,  ,  );


--A1L052 is Select~1625 at LCCOMB_X2_Y26_N18
A1L052 = BCD_SECD1[1] & (state.write_char7 # state.write_char5 & BCD_MIND0[1]) # !BCD_SECD1[1] & state.write_char5 & BCD_MIND0[1];


--A1L152 is Select~1626 at LCCOMB_X2_Y26_N30
A1L152 = state.mode_set # A1L052 # !A1L032;


--A1L252 is Select~1627 at LCCOMB_X2_Y26_N22
A1L252 = A1L481 & state.write_char10 & (BCD_TSEC[1]) # !A1L481 & (DATA_BUS_VALUE[1] # state.write_char10 & BCD_TSEC[1]);


--A1L352 is Select~1628 at LCCOMB_X2_Y26_N8
A1L352 = A1L842 # A1L152 # A1L942 # A1L252;


--BCD_SECD1[2] is BCD_SECD1[2] at LCFF_X1_Y24_N7
BCD_SECD1[2] = DFFEAS(A1L75, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L25,  ,  ,  ,  );


--BCD_MIND1[2] is BCD_MIND1[2] at LCFF_X3_Y26_N1
BCD_MIND1[2] = DFFEAS(A1L04, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L53,  ,  ,  ,  );


--A1L452 is Select~1629 at LCCOMB_X1_Y25_N14
A1L452 = BCD_MIND1[2] & (state.write_char4 # state.write_char7 & BCD_SECD1[2]) # !BCD_MIND1[2] & (state.write_char7 & BCD_SECD1[2]);


--BCD_HRD0[2] is BCD_HRD0[2] at LCFF_X3_Y25_N15
BCD_HRD0[2] = DFFEAS(A1L21, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L2,  ,  ,  ,  );


--BCD_HRD1[2] is BCD_HRD1[2] at LCFF_X3_Y25_N17
BCD_HRD1[2] = DFFEAS(A1L02, GLOBAL(A1L07), !GLOBAL(A1L522),  ,  ,  ,  ,  ,  );


--A1L552 is Select~1630 at LCCOMB_X1_Y25_N28
A1L552 = state.write_char1 & (BCD_HRD1[2] # BCD_HRD0[2] & state.write_char2) # !state.write_char1 & BCD_HRD0[2] & (state.write_char2);


--BCD_MIND0[2] is BCD_MIND0[2] at LCFF_X2_Y24_N23
BCD_MIND0[2] = DFFEAS(A1L13, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L52,  ,  ,  ,  );


--A1L652 is Select~1631 at LCCOMB_X1_Y25_N6
A1L652 = state.write_char5 & (BCD_MIND0[2] # state.write_char8 & BCD_SECD0[2]) # !state.write_char5 & state.write_char8 & (BCD_SECD0[2]);


--A1L752 is Select~1632 at LCCOMB_X1_Y25_N30
A1L752 = A1L652 # state.write_char9 # DATA_BUS_VALUE[2] & !A1L481;


--state.display_on is state.display_on at LCFF_X1_Y27_N23
state.display_on = DFFEAS(A1L613, GLOBAL(A1L57), !GLOBAL(A1L522),  ,  ,  ,  ,  ,  );


--A1L852 is Select~1633 at LCCOMB_X1_Y25_N22
A1L852 = state.mode_set # state.display_on # state.write_char10 & BCD_TSEC[2];


--A1L952 is Select~1634 at LCCOMB_X1_Y25_N4
A1L952 = A1L752 # A1L552 # A1L452 # A1L852;


--BCD_HRD0[3] is BCD_HRD0[3] at LCFF_X3_Y25_N5
BCD_HRD0[3] = DFFEAS(A1L11, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L2,  ,  ,  ,  );


--BCD_HRD1[3] is BCD_HRD1[3] at LCFF_X3_Y25_N25
BCD_HRD1[3] = DFFEAS(A1L22, GLOBAL(A1L07), !GLOBAL(A1L522),  ,  ,  ,  ,  ,  );


--A1L062 is Select~1635 at LCCOMB_X2_Y26_N14
A1L062 = state.write_char2 & (BCD_HRD0[3] # state.write_char1 & BCD_HRD1[3]) # !state.write_char2 & state.write_char1 & (BCD_HRD1[3]);


--BCD_MIND0[3] is BCD_MIND0[3] at LCFF_X2_Y24_N11
BCD_MIND0[3] = DFFEAS(A1L23, GLOBAL(A1L07), !GLOBAL(A1L522),  , A1L52,  ,  ,  ,  );


--A1L162 is Select~1636 at LCCOMB_X2_Y26_N26
A1L162 = BCD_SECD0[3] & (state.write_char8 # BCD_MIND0[3] & state.write_char5) # !BCD_SECD0[3] & BCD_MIND0[3] & (state.write_char5);


--A1L262 is Select~1637 at LCCOMB_X2_Y26_N28
A1L262 = state.write_char10 & BCD_TSEC[3];


--state.display_off is state.display_off at LCFF_X1_Y27_N31