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// license:BSD-3-Clause
// copyright-holders:Andrew Gardner
/***************************************************************************
dsp56k.h
Interface file for the portable Motorola/Freescale DSP56k emulator.
Written by Andrew Gardner
***************************************************************************/
#pragma once
#ifndef __DSP56K_H__
#define __DSP56K_H__
// IRQ Lines
// MODA and MODB are also known as IRQA and IRQB
#define DSP56K_IRQ_MODA 0
#define DSP56K_IRQ_MODB 1
#define DSP56K_IRQ_MODC 2
#define DSP56K_IRQ_RESET 3 /* Is this needed? */
/***************************************************************************
STRUCTURES & TYPEDEFS
***************************************************************************/
// 5-4 Host Interface
struct dsp56k_host_interface
{
// **** Dsp56k side **** //
// Host Control Register
uint16_t* hcr;
// Host Status Register
uint16_t* hsr;
// Host Transmit/Receive Data
uint16_t* htrx;
// **** Host CPU side **** //
// Interrupt Control Register
uint8_t icr;
// Command Vector Register
uint8_t cvr;
// Interrupt Status Register
uint8_t isr;
// Interrupt Vector Register
uint8_t ivr;
// Transmit / Receive Registers
uint8_t trxh;
uint8_t trxl;
// HACK - Host interface bootstrap write offset
uint16_t bootstrap_offset;
};
// 1-9 ALU
struct dsp56k_data_alu
{
// Four 16-bit input registers (can be accessed as 2 32-bit registers)
PAIR x;
PAIR y;
// Two 32-bit accumulator registers + 8-bit accumulator extension registers
PAIR64 a;
PAIR64 b;
// An accumulation shifter
// One data bus shifter/limiter
// A parallel, single cycle, non-pipelined Multiply-Accumulator (MAC) unit
// Basics
};
// 1-10 Address Generation Unit (AGU)
struct dsp56k_agu
{
// Four address registers
uint16_t r0;
uint16_t r1;
uint16_t r2;
uint16_t r3;
// Four offset registers
uint16_t n0;
uint16_t n1;
uint16_t n2;
uint16_t n3;
// Four modifier registers
uint16_t m0;
uint16_t m1;
uint16_t m2;
uint16_t m3;
// Used in loop processing
uint16_t temp;
// FM.4-5 - hmmm?
// uint8_t status;
// Basics
};
// 1-11 Program Control Unit (PCU)
struct dsp56k_pcu
{
// Program Counter
uint16_t pc;
// Loop Address
uint16_t la;
// Loop Counter
uint16_t lc;
// Status Register
uint16_t sr;
// Operating Mode Register
uint16_t omr;
// Stack Pointer
uint16_t sp;
// Stack (TODO: 15-level?)
PAIR ss[16];
// Controls IRQ processing
void (*service_interrupts)(void);
// A list of pending interrupts (indices into dsp56k_interrupt_sources array)
int8_t pending_interrupts[32];
// Basics
// Other PCU internals
uint16_t reset_vector;
};
// 1-8 The dsp56156 CORE
struct dsp56k_core
{
// PROGRAM CONTROLLER
dsp56k_pcu PCU;
// ADR ALU (AGU)
dsp56k_agu AGU;
// CLOCK GEN
//static emu_timer *dsp56k_timer; // 1-5, 1-8 - Clock gen
// DATA ALU
dsp56k_data_alu ALU;
// OnCE
// IBS and BITFIELD UNIT
// Host Interface
dsp56k_host_interface HI;
// IRQ line states
bool modA_state;
bool modB_state;
bool modC_state;
bool reset_state;
// HACK - Bootstrap mode state variable.
uint8_t bootstrap_mode;
uint8_t repFlag; // Knowing if we're in a 'repeat' state (dunno how the processor does this)
uint32_t repAddr; // The address of the instruction to repeat...
/* MAME internal stuff */
int icount;
uint32_t ppc;
uint32_t op;
int interrupt_cycles;
void (*output_pins_changed)(uint32_t pins);
cpu_device *device;
address_space *program;
direct_read_data *direct;
address_space *data;
uint16_t peripheral_ram[0x40];
uint16_t *program_ram;
};
class dsp56k_device : public cpu_device
{
public:
dsp56k_device(const machine_config &mconfig, const char *_tag, device_t *_owner, uint32_t _clock);
DECLARE_READ16_MEMBER( peripheral_register_r );
DECLARE_WRITE16_MEMBER( peripheral_register_w );
void host_interface_write(uint8_t offset, uint8_t data);
uint8_t host_interface_read(uint8_t offset);
uint16_t get_peripheral_memory(uint16_t addr);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// device_execute_interface overrides
virtual uint64_t execute_clocks_to_cycles(uint64_t clocks) const override { return (clocks + 2 - 1) / 2; }
virtual uint64_t execute_cycles_to_clocks(uint64_t cycles) const override { return (cycles * 2); }
virtual uint32_t execute_min_cycles() const override { return 1; }
virtual uint32_t execute_max_cycles() const override { return 8; }
virtual uint32_t execute_input_lines() const override { return 4; }
virtual uint32_t execute_default_irq_vector() const override { return 0; }
virtual void execute_run() override;
virtual void execute_set_input(int inputnum, int state) override;
// device_memory_interface overrides
virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override { return (spacenum == AS_PROGRAM) ? &m_program_config : ((spacenum == AS_DATA) ? &m_data_config : nullptr ); }
// device_state_interface overrides
virtual void state_string_export(const device_state_entry &entry, std::string &str) const override;
// device_disasm_interface overrides
virtual uint32_t disasm_min_opcode_bytes() const override { return 2; }
virtual uint32_t disasm_max_opcode_bytes() const override { return 4; }
virtual offs_t disasm_disassemble(std::ostream &stream, offs_t pc, const uint8_t *oprom, const uint8_t *opram, uint32_t options) override;
private:
address_space_config m_program_config;
address_space_config m_data_config;
required_shared_ptr<uint16_t> m_program_ram;
dsp56k_core m_dsp56k_core;
void agu_init();
void alu_init();
};
extern const device_type DSP56156;
#endif /* __DSP56K_H__ */
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