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// license:GPL-2.0+
// copyright-holders:Couriersud
/*
* nld_7490.h
*
* DM7490: Decade Counters
*
* +--------------+
* B |1 ++ 14| A
* R01 |2 13| NC
* R02 |3 12| QA
* NC |4 7490 11| QD
* VCC |5 10| GND
* R91 |6 9| QB
* R92 |7 8| QC
* +--------------+
*
* Counter Sequence
*
* +-------++----+----+----+----+
* | COUNT || QD | QC | QB | QA |
* +=======++====+====+====+====+
* | 0 || 0 | 0 | 0 | 0 |
* | 1 || 0 | 0 | 0 | 1 |
* | 2 || 0 | 0 | 1 | 0 |
* | 3 || 0 | 0 | 1 | 1 |
* | 4 || 0 | 1 | 0 | 0 |
* | 5 || 0 | 1 | 0 | 1 |
* | 6 || 0 | 1 | 1 | 0 |
* | 7 || 0 | 1 | 1 | 1 |
* | 8 || 1 | 0 | 0 | 0 |
* | 9 || 1 | 0 | 0 | 1 |
* +-------++----+----+----+----+
*
* Note A Output QA is connected to input B for BCD count
*
* Reset Count Function table
*
* +-----+-----+-----+-----++----+----+----+----+
* | R01 | R02 | R91 | R92 || QD | QC | QB | QA |
* +=====+=====+=====+=====++====+====+====+====+
* | 1 | 1 | 0 | X || 0 | 0 | 0 | 0 |
* | 1 | 1 | X | 0 || 0 | 0 | 0 | 0 |
* | X | X | 1 | 1 || 1 | 0 | 0 | 1 |
* | X | 0 | X | 0 || COUNT |
* | 0 | X | 0 | X || COUNT |
* | 0 | X | X | 0 || COUNT |
* | X | 0 | 0 | X || COUNT |
* +-----+-----+-----+-----++----+----+----+----+
*
* Naming conventions follow National Semiconductor datasheet
*
*/
#ifndef NLD_7490_H_
#define NLD_7490_H_
#include "../nl_base.h"
#define TTL_7490(_name, _CLK, _R1, _R2, _R91, _R92) \
NET_REGISTER_DEV(7490, _name) \
NET_CONNECT(_name, CLK, _CLK) \
NET_CONNECT(_name, R1, _R1) \
NET_CONNECT(_name, R2, _R2) \
NET_CONNECT(_name, R91, _R91) \
NET_CONNECT(_name, R92, _R92)
NETLIB_DEVICE(7490,
ATTR_HOT void update_outputs();
netlist_ttl_input_t m_R1;
netlist_ttl_input_t m_R2;
netlist_ttl_input_t m_R91;
netlist_ttl_input_t m_R92;
netlist_ttl_input_t m_clk;
UINT8 m_cnt;
netlist_ttl_output_t m_Q[4];
);
#endif /* NLD_7490_H_ */
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