// license:BSD-3-Clause // copyright-holders:Aaron Giles /***************************************************************************** 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 typedef device_delegate ttl74153_output_delegate; #define TTL74153_OUTPUT_CB(_name) void _name(void) class ttl74153_device : public device_t { public: ttl74153_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); ~ttl74153_device() {} static void set_output_callback(device_t &device, ttl74153_output_delegate callback) { downcast(device).m_output_cb = callback; } /* must call update() after setting the inputs */ void update(); void a_w(int data); void b_w(int data); void input_line_w(int section, int input_line, int data); void enable_w(int section, int data); int output_r(int section); protected: // device-level overrides virtual void device_start() override; virtual void device_reset() override; private: // internal state ttl74153_output_delegate m_output_cb; /* inputs */ int m_a; /* pin 14 */ int m_b; /* pin 2 */ int m_input_lines[2][4]; /* pins 3-6,10-13 */ int m_enable[2]; /* pins 1,15 */ /* output */ int m_output[2]; /* pins 7,9 */ /* internals */ int m_last_output[2]; }; extern const device_type TTL74153; #define MCFG_74153_OUTPUT_CB(_class, _method) \ ttl74153_device::set_output_callback(*device, ttl74153_output_delegate(&_class::_method, #_class "::" #_method, downcast<_class *>(owner))); #endif