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Diffstat (limited to 'trunk/src/emu/machine/er2055.h')
-rw-r--r-- | trunk/src/emu/machine/er2055.h | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/er2055.h b/trunk/src/emu/machine/er2055.h new file mode 100644 index 00000000000..f47b503d57c --- /dev/null +++ b/trunk/src/emu/machine/er2055.h @@ -0,0 +1,113 @@ +/*************************************************************************** + + er2055.h + + GI 512 bit electrically alterable read-only memory. + +**************************************************************************** + + Copyright Aaron Giles + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are + met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in + the documentation and/or other materials provided with the + distribution. + * Neither the name 'MAME' nor the names of its contributors may be + used to endorse or promote products derived from this software + without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR + IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT, + INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. + +***************************************************************************/ + +#pragma once + +#ifndef __ER2055_H__ +#define __ER2055_H__ + + + +//************************************************************************** +// INTERFACE CONFIGURATION MACROS +//************************************************************************** + +#define MCFG_ER2055_ADD(_tag) \ + MCFG_DEVICE_ADD(_tag, ER2055, 0) \ + + + +//************************************************************************** +// TYPE DEFINITIONS +//************************************************************************** + + +// ======================> er2055_device + +class er2055_device : public device_t, + public device_memory_interface, + public device_nvram_interface +{ +public: + // construction/destruction + er2055_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + + // I/O operations + UINT8 data() const { return m_data; } + void set_address(UINT8 address) { m_address = address & 0x3f; } + void set_data(UINT8 data) { m_data = data; } + + // control lines -- all lines are specified as active-high (even CS2) + void set_control(UINT8 cs1, UINT8 cs2, UINT8 c1, UINT8 c2, UINT8 ck); + +protected: + // device-level overrides + virtual void device_start(); + + // device_memory_interface overrides + virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const; + + // device_nvram_interface overrides + virtual void nvram_default(); + virtual void nvram_read(emu_file &file); + virtual void nvram_write(emu_file &file); + + static const int SIZE_DATA = 0x40; + + static const UINT8 CK = 0x01; + static const UINT8 C1 = 0x02; + static const UINT8 C2 = 0x04; + static const UINT8 CS1 = 0x08; + static const UINT8 CS2 = 0x10; + + // configuration state + address_space_config m_space_config; + + // internal state + UINT8 m_control_state; + UINT8 m_address; + UINT8 m_data; +}; + + +// device type definition +extern const device_type ER2055; + + +#endif |