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// 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<void (void)> 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<ttl74153_device &>(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();
virtual void device_reset();
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
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