MAME SVN History

199869 Revisions

r23302 Thursday 30th May, 2013 at 15:23:23 UTC by hap
nevermind this yet

[src/emu/machine]

7200fifo.c 7200fifo.h

trunk/src/emu/machine/7200fifo.c
r23301	r23302
4	4
5	5	TODO:
6	6	- retransmit (RT pin)
	7	- cascaded width expansion mode (when needed)
7	8
8	9	**********************************************************************/
9	10
r23301	r23302
71	72
72	73
73	74
74		void fifo7200_device::fifo_write(UINT32 data)
	75	void fifo7200_device::fifo_write(UINT16 data)
75	76	{
76	77	if (m_ff)
77	78	{
r23301	r23302
79	80	return;
80	81	}
81	82
82		m_buffer[m_write_ptr] = data;
	83	m_buffer[m_write_ptr] = data & 0x1ff;
83	84	m_write_ptr = (m_write_ptr + 1) % m_ram_size;
84	85
85	86	// update flags
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102	103	}
103	104	}
104	105
105		UINT32 fifo7200_device::fifo_read()
	106	UINT16 fifo7200_device::fifo_read()
106	107	{
107	108	if (m_ef)
108	109	{
109	110	logerror("IDT7200 %s fifo_read underflow!\n", tag());
110		return ~0;
	111	return 0x1ff;
111	112	}
112	113
113	114	UINT16 ret = m_buffer[m_read_ptr];

trunk/src/emu/machine/7200fifo.h
r23301	r23302
102	102	DECLARE_WRITE8_MEMBER( data_byte_w ) { fifo_write(data); }
103	103	DECLARE_READ8_MEMBER( data_byte_r ) { return (UINT8)fifo_read(); }
104	104
105		// use these for configurations in cascaded width expansion mode using more than 16 bits
106		DECLARE_WRITE32_MEMBER( data_dword_w ) { fifo_write(data); }
107		DECLARE_READ32_MEMBER( data_dword_r ) { return (UINT32)fifo_read(); }
108
109	105	protected:
110	106	// device-level overrides
111	107	virtual void device_start();
112	108	virtual void device_reset();
113	109
114	110	private:
115		void fifo_write(UINT32 data);
116		UINT32 fifo_read();
	111	void fifo_write(UINT16 data);
	112	UINT16 fifo_read();
117	113
118	114	UINT16* m_buffer;
119	115	int m_ram_size;

199869 Revisions