BSDL Files Library for JTAG

The only free public library that contains thousands of BSDL (Boundary Scan Description Language) models to use with BScan/JTAG tools

BSDL model: SN74ABT8646

-------------------------------------------------------------------------------
--  TI SN74ABT8646                                                           --
--     IEEE Std 1149.1 (JTAG) Boundary-Scan Test Device                      --
--     with Octal Bus Transceivers and Registers                             --
-------------------------------------------------------------------------------
--  Created by    : Texas Instruments Incorporated                           --
--  Documentation : SN74ABT8646 Data Sheet (SCBS123)                         --
--  Product Status: Released to Production (RTP)                             --
--  BSDL revision : 1.2                                                      --
--  BSDL status   : Production                                               --
--  Date created  : 05/01/94                                                 --
--  Last modified : 07/26/97                                                 --
--  Modification history -                                                   --
--      - misc clean-up, cosmetic only                                       --
--      - remove package constant NT, add package constant DL                --
-------------------------------------------------------------------------------
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-------------------------------------------------------------------------------

entity sn74abt8646 is

    generic (PHYSICAL_PIN_MAP : string := "UNDEFINED");

    port (CLKAB:in bit;
          CLKBA:in bit;
          SAB:in bit;
          SBA:in bit;
          DIR:in bit;
          OE_NEG:in bit;
          A:inout bit_vector(1 to 8);
          B:inout bit_vector(1 to 8);
          GND, VCC:linkage bit;
          TDO:out bit;
          TDI, TMS, TCK:in bit);

    use STD_1149_1_1990.all; -- Get standard attributes and definitions

    attribute PIN_MAP of sn74abt8646 : entity is PHYSICAL_PIN_MAP;

    constant JT : PIN_MAP_STRING := "CLKAB:1, CLKBA:28," &
                  "SAB:2, SBA:27, DIR:3," &
                  "OE_NEG:26, GND:7, VCC:21, TDO:13, TMS:14," &
                  "TCK:15, TDI:16, A:(4,5,6,8,9,10,11,12)," &
                  "B:(25,24,23,22,20,19,18,17)";

    constant DL : PIN_MAP_STRING := "CLKAB:1, CLKBA:28," &
                  "SAB:2, SBA:27, DIR:3," &
                  "OE_NEG:26, GND:7, VCC:21, TDO:13, TMS:14," &
                  "TCK:15, TDI:16, A:(4,5,6,8,9,10,11,12)," &
                  "B:(25,24,23,22,20,19,18,17)";

    constant DW : PIN_MAP_STRING := "CLKAB:1, CLKBA:28," &
                  "SAB:2, SBA:27, DIR:3," &
                  "OE_NEG:26, GND:7, VCC:21, TDO:13, TMS:14," &
                  "TCK:15, TDI:16, A:(4,5,6,8,9,10,11,12)," &
                  "B:(25,24,23,22,20,19,18,17)";

    constant FK : PIN_MAP_STRING := "CLKAB:8, CLKBA:7," &
                  "SAB:9, SBA:6, DIR:10," &
                  "OE_NEG:5, GND:14, VCC:28, TDO:20, TMS:21," &
                  "TCK:22, TDI:23, A:(11,12,13,15,16,17,18,19)," &
                  "B:(4,3,2,1,27,26,25,24)";

    attribute TAP_SCAN_IN    of TDI : signal is true;
    attribute TAP_SCAN_MODE  of TMS : signal is true;
    attribute TAP_SCAN_OUT   of TDO : signal is true;
    attribute TAP_SCAN_CLOCK of TCK : signal is (50.0e6, BOTH);

    attribute INSTRUCTION_LENGTH of sn74abt8646 : entity is 8;
    attribute INSTRUCTION_OPCODE of sn74abt8646 : entity is
            "BYPASS (11111111, 10000001), " &
            "EXTEST (00000000), " &
            "SAMPLE (10000010), " &
            "INTEST (00000011), " &
            "HIGHZ  (00000110), " &  -- Control Boundary to High-Impedance
            "CLAMP  (10000111), " &  -- Control Boundary to 1/0
            "RUNT   (00001001), " &  -- Boundary Run Test
            "READBN (00001010), " &  -- Boundary Read Normal Mode
            "READBT (10001011), " &  -- Boundary Read Test Mode
            "CELLTST(00001100), " &  -- Boundary Self-Test Normal Mode
            "TOPHIP (10001101), " &  -- Boundary Toggle Outputs Test Mode
            "SCANCN (10001110), " &  -- BCR Scan Normal Mode
            "SCANCT (00001111)  " ;  -- BCR Scan Test Mode

    attribute INSTRUCTION_CAPTURE of sn74abt8646 : entity is "10000001";
    attribute INSTRUCTION_DISABLE of sn74abt8646 : entity is "HIGHZ";
    attribute INSTRUCTION_GUARD   of sn74abt8646 : entity is "CLAMP";

    attribute REGISTER_ACCESS of sn74abt8646 : entity is
            "BOUNDARY (EXTEST, SAMPLE, INTEST, READBN, READBT, CELLTST),"  &
            "BYPASS   (BYPASS, HIGHZ, CLAMP, RUNT, TOPHIP)," &
            "BCR[11]   (SCANCN, SCANCT)" ;

    attribute BOUNDARY_CELLS    of sn74abt8646 : entity is "BC_1";
    attribute BOUNDARY_LENGTH   of sn74abt8646 : entity is 40;
    attribute BOUNDARY_REGISTER of sn74abt8646 : entity is

    "0  (BC_1, B(1)  ,output3 , X, 39, 0, Z),"  &
    "1  (BC_1, B(2)  ,output3 , X, 39, 0, Z),"  &
    "2  (BC_1, B(3)  ,output3 , X, 39, 0, Z),"  &
    "3  (BC_1, B(4)  ,output3 , X, 39, 0, Z),"  &
    "4  (BC_1, B(5)  ,output3 , X, 39, 0, Z),"  &
    "5  (BC_1, B(6)  ,output3 , X, 39, 0, Z),"  &
    "6  (BC_1, B(7)  ,output3 , X, 39, 0, Z),"  &
    "7  (BC_1, B(8)  ,output3 , X, 39, 0, Z),"  &
    "8  (BC_1, B(1)  ,input   , X),"  &
    "9  (BC_1, B(2)  ,input   , X),"  &
    "10 (BC_1, B(3)  ,input   , X),"  &
    "11 (BC_1, B(4)  ,input   , X),"  &
    "12 (BC_1, B(5)  ,input   , X),"  &
    "13 (BC_1, B(6)  ,input   , X),"  &
    "14 (BC_1, B(7)  ,input   , X),"  &
    "15 (BC_1, B(8)  ,input   , X),"  &
    "16 (BC_1, A(1)  ,output3 , X, 38, 0, Z),"  &
    "17 (BC_1, A(2)  ,output3 , X, 38, 0, Z),"  &
    "18 (BC_1, A(3)  ,output3 , X, 38, 0, Z),"  &
    "19 (BC_1, A(4)  ,output3 , X, 38, 0, Z),"  &
    "20 (BC_1, A(5)  ,output3 , X, 38, 0, Z),"  &
    "21 (BC_1, A(6)  ,output3 , X, 38, 0, Z),"  &
    "22 (BC_1, A(7)  ,output3 , X, 38, 0, Z),"  &
    "23 (BC_1, A(8)  ,output3 , X, 38, 0, Z),"  &
    "24 (BC_1, A(1)  ,input   , X),"  &
    "25 (BC_1, A(2)  ,input   , X),"  &
    "26 (BC_1, A(3)  ,input   , X),"  &
    "27 (BC_1, A(4)  ,input   , X),"  &
    "28 (BC_1, A(5)  ,input   , X),"  &
    "29 (BC_1, A(6)  ,input   , X),"  &
    "30 (BC_1, A(7)  ,input   , X),"  &
    "31 (BC_1, A(8)  ,input   , X),"  &
    "32 (BC_1, SBA   ,input   , X),"  &
    "33 (BC_1, SAB   ,input   , X),"  &
    "34 (BC_1, CLKBA ,input   , X),"  &
    "35 (BC_1, CLKAB ,input   , X),"  &
    "36 (BC_1, OE_NEG,input   , X),"  &
    "37 (BC_1, DIR   ,input   , X),"  &
    "38 (BC_1, *     ,controlr, 0),"  &
    "39 (BC_1, *     ,controlr, 0) "  ;

end sn74abt8646;