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/*********************************************************************
er59256.h
Microchip ER59256 serial eeprom.
*********************************************************************/
#ifndef _ER59256_H_
#define _ER59256_H_
/***************************************************************************
MACROS
***************************************************************************/
class er59256_device : public device_t
{
public:
er59256_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
~er59256_device() { global_free(m_token); }
// access to legacy token
void *token() const { assert(m_token != NULL); return m_token; }
protected:
// device-level overrides
virtual void device_config_complete();
virtual void device_start();
virtual void device_stop();
private:
// internal state
void *m_token;
};
extern const device_type ER59256;
#define MCFG_ER59256_ADD(_tag) \
MCFG_DEVICE_ADD((_tag), ER59256, 0)
/***************************************************************************
CONSTANTS
***************************************************************************/
#define EEROM_WORDS 0x10
#define CK_SHIFT 0x00
#define DI_SHIFT 0x01
#define DO_SHIFT 0x02
#define CS_SHIFT 0x03
#define CK_MASK (1<<CK_SHIFT)
#define DI_MASK (1<<DI_SHIFT)
#define DO_MASK (1<<DO_SHIFT)
#define CS_MASK (1<<CS_SHIFT)
#define ALL_MASK (CK_MASK | DI_MASK | DO_MASK | CS_MASK)
#define IN_MASK (CK_MASK | DI_MASK | CS_MASK)
#define GET_CK(eep) ((eep->io_bits & CK_MASK) >> CK_SHIFT)
#define GET_DI(eep) ((eep->io_bits & DI_MASK) >> DI_SHIFT)
#define GET_DO(eep) ((eep->io_bits & DO_MASK) >> DO_SHIFT)
#define GET_CS(eep) ((eep->io_bits & CS_MASK) >> CS_SHIFT)
#define SET_CK(eep,data) eep->io_bits=((eep->io_bits & ~CK_MASK) | ((data & 0x01) << CK_SHIFT))
#define SET_DI(eep,data) eep->io_bits=((eep->io_bits & ~DI_MASK) | ((data & 0x01) << DI_SHIFT))
#define SET_DO(eep,data) eep->io_bits=((eep->io_bits & ~DO_MASK) | ((data & 0x01) << DO_SHIFT))
#define SET_CS(eep,data) eep->io_bits=((eep->io_bits & ~CS_MASK) | ((data & 0x01) << CS_SHIFT))
#define CK_RISE(eep) ((eep->io_bits & CK_MASK) & ~(eep->old_io_bits & CK_MASK))
#define CS_RISE(eep) ((eep->io_bits & CS_MASK) & ~(eep->old_io_bits & CS_MASK))
#define CS_VALID(eep) ((eep->io_bits & CS_MASK) & (eep->old_io_bits & CS_MASK))
#define CK_FALL(eep) (~(eep->io_bits & CK_MASK) & (eep->old_io_bits & CK_MASK))
#define CS_FALL(eep) (~(eep->io_bits & CS_MASK) & (eep->old_io_bits & CS_MASK))
#define SHIFT_IN(eep) eep->in_shifter=(eep->in_shifter<<1) | GET_DI(eep)
#define SHIFT_OUT(eep) SET_DO(eep,(eep->out_shifter & 0x10000)>>16); eep->out_shifter=(eep->out_shifter<<1)
#define CMD_READ 0x80
#define CMD_WRITE 0x40
#define CMD_ERASE 0xC0
#define CMD_EWEN 0x30
#define CMD_EWDS 0x00
#define CMD_ERAL 0x20
#define CMD_INVALID 0xF0
#define CMD_MASK 0xF0
#define ADDR_MASK 0x0F
// CMD_BITLEN is 1 start bit plus 4 command bits plus 4 address bits
#define CMD_BITLEN 8
#define DATA_BITLEN 16
#define WRITE_BITLEN CMD_BITLEN+DATA_BITLEN
#define FLAG_WRITE_EN 0x01
#define FLAG_START_BIT 0x02
#define FLAG_DATA_LOADED 0x04
#define WRITE_ENABLED(eep) ((eep->flags & FLAG_WRITE_EN) ? 1 : 0)
#define STARTED(eep) ((eep->flags & FLAG_START_BIT) ? 1 : 0)
/***************************************************************************
FUNCTION PROTOTYPES
***************************************************************************/
void er59256_set_iobits(device_t *device, UINT8 newbits);
UINT8 er59256_get_iobits(device_t *device);
void er59256_preload_rom(device_t *device, const UINT16 *rom_data, int count);
UINT8 er59256_data_loaded(device_t *device);
#endif
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