/***************************************************************************** 74153 Dual 4-line to 1-line data selectors/multiplexers Pin layout and functions to access pins: enable_w(0) [1] /1G VCC [16] b_w [2] B /2G [15] enable_w(1) input_line_w(0,3) [3] 1C3 A [14] a_w input_line_w(0,2) [4] 1C2 2C3 [13] input_line_w(1,3) input_line_w(0,1) [5] 1C1 2C2 [12] input_line_w(1,2) input_line_w(0,0) [6] 1C0 2C1 [11] input_line_w(1,1) output_r(0) [7] 1Y 2C0 [10] input_line_w(1,0) [8] GND 2Y [9] output_r(1) Truth table (all logic levels indicate the actual voltage on the line): INPUTS | OUTPUT | G | B A | C0 C1 C2 C3 | Y --+------+-------------+--- H | X X | X X X X | L L | L L | X X X X | C0 L | L H | X X X X | C1 L | H L | X X X X | C2 L | H H | X X X X | C3 --+------+-------------+--- L = lo (0) H = hi (1) X = any state *****************************************************************************/ #ifndef TTL74153_H #define TTL74153_H /* The interface structure */ struct TTL74153_interface { void (*output_cb)(void); }; void TTL74153_config(int which, const struct TTL74153_interface *intf); /* must call TTL74153_update() after setting the inputs */ void TTL74153_update(int which); void TTL74153_a_w(int which, int data); void TTL74153_b_w(int which, int data); void TTL74153_input_line_w(int which, int section, int input_line, int data); void TTL74153_enable_w(int which, int section, int data); int TTL74153_output_r(int which, int section); #endif