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https://github.com/holub/mame
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Add octal registered transceiver 74543
This commit is contained in:
Michael Zapf
parent
ea677489db
commit
c5b838bc2c
@ -523,6 +523,18 @@ if (MACHINES["TTL74381"]~=null) then
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}
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end
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---------------------------------------------------
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--
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--@src/devices/machine/74543.h,MACHINES["TTL74543"] = true
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---------------------------------------------------
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if (MACHINES["TTL74543"]~=null) then
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files {
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MAME_DIR .. "src/devices/machine/74543.cpp",
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MAME_DIR .. "src/devices/machine/74543.h",
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}
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end
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---------------------------------------------------
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--
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--@src/devices/machine/7474.h,MACHINES["TTL7474"] = true
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120
src/devices/machine/74543.cpp
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120
src/devices/machine/74543.cpp
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@ -0,0 +1,120 @@
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// license:BSD-3-Clause
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// copyright-holders:Michael Zapf
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/*****************************************************************************
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74543: Octal Registered Transceiver
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(typically 74F543)
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*****************************************************************************/
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#include "emu.h"
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#include "74543.h"
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DEFINE_DEVICE_TYPE(TTL74543, ttl74543_device, "ttl74543", "Octal Registered Transceiver")
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ttl74543_device::ttl74543_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
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: device_t(mconfig, TTL74543, tag, owner, clock),
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m_output_a(*this),
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m_output_b(*this),
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m_ceabpre(false),
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m_leabpre(false),
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m_oeabpre(false),
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m_cebapre(false),
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m_lebapre(false),
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m_oebapre(false)
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{
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}
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void ttl74543_device::device_start()
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{
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save_item(NAME(m_ceab));
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save_item(NAME(m_leab));
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save_item(NAME(m_oeab));
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save_item(NAME(m_ceba));
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save_item(NAME(m_leba));
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save_item(NAME(m_oeba));
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save_item(NAME(m_latch));
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m_output_a.resolve_safe();
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m_output_b.resolve_safe();
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}
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void ttl74543_device::device_reset()
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{
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m_ceab = m_ceabpre;
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m_leab = m_leabpre;
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m_oeab = m_oeabpre;
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m_ceba = m_cebapre;
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m_leba = m_lebapre;
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m_oeba = m_oebapre;
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}
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/*
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Data I/O control table:
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Inputs Latch Output
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CEAB* LEAB* OEAB* Status Buffers
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-----------------------------------------
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H X X Latched High Z A->B flow shown
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X H X Latched - B->A flow control is the same
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L L X Transparent - except using CEBA*, LEBA*, OEBA*
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X X H - High Z
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L X L - Driving
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X = immaterial
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*/
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void ttl74543_device::a_w(uint8_t a)
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{
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if (m_ceab && m_leab) m_latch = a;
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}
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void ttl74543_device::b_w(uint8_t b)
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{
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if (m_ceba && m_leba) m_latch = b;
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}
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void ttl74543_device::outputb_rz(uint8_t& value)
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{
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if (m_ceab && m_oeab) value = m_latch;
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}
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void ttl74543_device::outputa_rz(uint8_t& value)
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{
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if (m_ceba && m_oeba) value = m_latch;
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}
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WRITE_LINE_MEMBER( ttl74543_device::ceab_w )
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{
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m_ceab = (state == 0);
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if (m_ceab && m_oeab) m_output_b(m_latch);
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}
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WRITE_LINE_MEMBER( ttl74543_device::leab_w )
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{
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m_leab = (state == 0);
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}
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WRITE_LINE_MEMBER( ttl74543_device::oeab_w )
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{
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m_oeab = (state == 0);
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if (m_ceab && m_oeab) m_output_b(m_latch);
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}
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WRITE_LINE_MEMBER( ttl74543_device::ceba_w )
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{
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m_ceba = (state == 0);
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if (m_ceba && m_oeba) m_output_a(m_latch);
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}
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WRITE_LINE_MEMBER( ttl74543_device::leba_w )
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{
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m_leba = (state == 0);
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}
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WRITE_LINE_MEMBER( ttl74543_device::oeba_w )
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{
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m_oeba = (state == 0);
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if (m_ceba && m_oeba) m_output_a(m_latch);
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}
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124
src/devices/machine/74543.h
Normal file
124
src/devices/machine/74543.h
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@ -0,0 +1,124 @@
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// license:BSD-3-Clause
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// copyright-holders:Michael Zapf
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/*****************************************************************************
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74543: Octal Registered Transceiver
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(typically 74F543)
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***********************************************************************
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Connection Diagram:
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_________
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LEBA* 1 | | | | 24 Vcc
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OEBA* 2 | --- | 23 CEBA*
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A0 3 | | 22 B0
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A1 4 | | 21 B1
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A2 5 | | 20 B2
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A3 6 | | 19 B3
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A4 7 | | 18 B4
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A5 8 | | 17 B5
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A6 9 | | 16 B6
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A7 10 | | 15 B7
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CEAB* 11 | | 14 LEAB*
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GND 12 |_________| 13 OEAB*
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Logic Symbol:
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____|______|____
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| A0 ... A7 |
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--O| OEAB |
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--O| OEBA |
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--O| CEAB |
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--O| CEBA |
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--O| LEAB |
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--O| LEBA |
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| B0 ... B7 |
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|________________|
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***********************************************************************
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Data I/O control table:
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Inputs Latch Output
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CEAB* LEAB* OEAB* Status Buffers
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-----------------------------------------
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H X X Latched High Z A->B flow shown
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X H X Latched - B->A flow control is the same
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L L X Transparent - except using CEBA*, LEBA*, OEBA*
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X X H - High Z
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L X L - Driving
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X = immaterial
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**********************************************************************/
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#ifndef MAME_MACHINE_74543_H
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#define MAME_MACHINE_74543_H
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#pragma once
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class ttl74543_device : public device_t
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{
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public:
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ttl74543_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
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auto outputa_cb() { return m_output_a.bind(); }
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auto outputb_cb() { return m_output_b.bind(); }
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// public interfaces
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DECLARE_WRITE_LINE_MEMBER(ceab_w);
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DECLARE_WRITE_LINE_MEMBER(leab_w);
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DECLARE_WRITE_LINE_MEMBER(oeab_w);
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DECLARE_WRITE_LINE_MEMBER(ceba_w);
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DECLARE_WRITE_LINE_MEMBER(leba_w);
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DECLARE_WRITE_LINE_MEMBER(oeba_w);
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void a_w(uint8_t a);
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void b_w(uint8_t a);
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void outputa_rz(uint8_t& value);
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void outputb_rz(uint8_t& value);
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// Preset values
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// for lines tied to H or L
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void set_ceab_pin_value(int value) { m_ceabpre = (value==0); }
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void set_leab_pin_value(int value) { m_leabpre = (value==0); }
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void set_oeab_pin_value(int value) { m_oeabpre = (value==0); }
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void set_ceba_pin_value(int value) { m_cebapre = (value==0); }
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void set_leba_pin_value(int value) { m_lebapre = (value==0); }
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void set_oeba_pin_value(int value) { m_oebapre = (value==0); }
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protected:
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// device-level overrides
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void device_start() override;
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void device_reset() override;
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private:
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devcb_write8 m_output_a;
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devcb_write8 m_output_b;
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bool m_ceab;
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bool m_leab;
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bool m_oeab;
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bool m_ceba;
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bool m_leba;
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bool m_oeba;
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bool m_ceabpre;
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bool m_leabpre;
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bool m_oeabpre;
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bool m_cebapre;
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bool m_lebapre;
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bool m_oebapre;
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uint8_t m_latch;
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};
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// device type definition
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DECLARE_DEVICE_TYPE(TTL74543, ttl74543_device)
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#endif // MAME_MACHINE_74161_H
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