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|
// license:BSD-3-Clause
// copyright-holders:Mark Garlanger
/***************************************************************************
American Microsystems, Inc. (AMI) S2350 Universal Synchronous Receiver/Transmitter(USRT)
Chip Features
- 500kHz Data Rates
- Internal Sync Detection
- Fill Character Register
- Double Buffered Input/Output
- Bus Oriented Outputs
- 5-8 Bit Characters
- Odd/Even or No Parity
- Error Status Flags
Current assumptions:
- Data size == 8
- Parity == NONE
Not Implemented
- parity
- data size (other than 8)
**********************************************************************
_____ _____
GND 1 |* \_/ | 40 NDB2
Vcc 2 | | 39 NDB1
NPB 3 | | 38 TDS
POE 4 | | 37 RCP
CS 5 | | 36 TCP
TSO 6 | | 35 RDE
FCT 7 | | 34 SWE
SCR 8 | | 33 RD0
TBMT 9 | AMI | 32 RD1
RPE 10 | S2350 | 31 RD2
ROR 11 | | 30 RD3
RDA 12 | | 29 RD4
RR 13 | | 28 RD5
RESET 14 | | 27 RD6
D0 15 | | 26 RD7
D1 16 | | 25 RSI
D2 17 | | 24 TFS
D3 18 | | 23 RSS
D4 19 | | 22 D7
D5 20 |_____________| 21 D6
Name Pin No. Function
----------------------------------------------------------------------
D0-D7 15-22 Data Inputs
RD7-RD70 26-33 Received Data Outputs
TDS 38 Transmit Data Strobe
TFS 24 Transmit Fill Strobe
RSS 23 Receiver Sync Strobe
TBMT 9 Transmit Buffer Empty
TSO 6 Transmitter Serial Output
TCP 36 Transmit Clock
RDE 35 Receive Data Enable
FCT 7 Fill Character Transmitted
RSI 25 Receiver Serial Input
RCP 37 Receiver Clock
RDA 12 Received Data Available
SCR 8 Sync Character Received
SWE 34 Status Word Enable
ROR 11 Receiver Overrun
RPE 10 Receiver Parity Error
RR 13 Receiver Restart
NDB1/NDB2 39-40 Number Data Bits
NPB 3 No Parity Bit
POE 4 Parity Odd/Even
CS 5 Control Strobe
RESET 14 Master Reset
Vcc 2 +5.0V
GND 1 Ground
***************************************************************************/
#include "emu.h"
#include "s2350.h"
// Shows register setup
#define LOG_REG (1U << 1)
// Show control lines
#define LOG_LINE (1U << 2)
// Function calls
#define LOG_FUNC (1U << 3)
// Sync detect
#define LOG_SYNC (1U << 4)
//#define VERBOSE (0xff)
#include "logmacro.h"
#define LOGREG(...) LOGMASKED(LOG_REG, __VA_ARGS__)
#define LOGLINE(...) LOGMASKED(LOG_LINE, __VA_ARGS__)
#define LOGFUNC(...) LOGMASKED(LOG_FUNC, __VA_ARGS__)
#define LOGSYNC(...) LOGMASKED(LOG_SYNC, __VA_ARGS__)
#ifdef _MSC_VER
#define FUNCNAME __func__
#else
#define FUNCNAME __PRETTY_FUNCTION__
#endif
DEFINE_DEVICE_TYPE(S2350, s2350_device, "s2350", "American Microsystems Inc. S2350 USRT")
s2350_device::s2350_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) :
device_t(mconfig, S2350, tag, owner, clock),
m_tbmt(*this),
m_fct(*this),
m_tx_cb(*this),
m_rda(*this),
m_scr(*this),
m_ror(*this),
m_rpe(*this)
{
}
s2350_device::~s2350_device()
{
}
void s2350_device::device_start()
{
save_item(NAME(m_transmit_buffer_empty));
save_item(NAME(m_fill_char_transmitted));
save_item(NAME(m_transmitter_holding_reg));
save_item(NAME(m_transmitter_fill_reg));
save_item(NAME(m_transmitter_shift_reg));
save_item(NAME(m_serial_tx_state));
save_item(NAME(m_received_data_available));
save_item(NAME(m_receiver_overrun));
save_item(NAME(m_receiver_parity_error));
save_item(NAME(m_sync_character_received));
save_item(NAME(m_receiver_output_reg));
save_item(NAME(m_receiver_sync_reg));
save_item(NAME(m_receiver_shift_reg));
save_item(NAME(m_serial_rx_state));
save_item(NAME(m_in_sync));
}
void s2350_device::device_reset()
{
// transmitter flags
set_transmit_buffer_empty(true);
set_fill_char_transmitted(false);
// transmitter registers
m_transmitter_shift_reg = 0xff;
m_transmitter_holding_reg = 0xff;
m_transmitter_fill_reg = 0x00;
m_serial_tx_state = 0;
set_received_data_available(false);
set_receiver_overrun(false);
set_receiver_parity_error(false);
set_sync_character_received(false);
m_sync_search_active = false;
m_in_sync = false;
m_serial_rx_state = 0;
// receiver registers
m_receiver_output_reg = 0x00;
m_receiver_sync_reg = 0x00;
m_receiver_shift_reg = 0x00;
}
void s2350_device::transmitter_holding_reg_w(u8 data)
{
LOGREG("%s: 0x%02x\n", FUNCNAME, data);
m_transmitter_holding_reg = data;
set_transmit_buffer_empty(false);
}
void s2350_device::transmit_fill_reg_w(u8 data)
{
LOGREG("%s: 0x%02x\n", FUNCNAME, data);
m_transmitter_fill_reg = data;
}
void s2350_device::receiver_sync_reg_w(u8 data)
{
LOGREG("%s: 0x%02x\n", FUNCNAME, data);
m_receiver_sync_reg = data;
}
u8 s2350_device::receiver_sync_search()
{
set_sync_character_received(false);
m_sync_search_active = true;
LOGREG("%s: 0x%02x\n", FUNCNAME, m_receiver_sync_reg);
return m_receiver_sync_reg;
}
u8 s2350_device::receiver_output_reg_r()
{
set_received_data_available(false);
LOGREG("%s: 0x%02x\n", FUNCNAME, m_receiver_output_reg);
return m_receiver_output_reg;
}
u8 s2350_device::status_word_r()
{
u8 status = 0x00;
status |= m_received_data_available ? 0x01 : 0x00;
status |= m_receiver_overrun ? 0x02 : 0x00;
status |= m_receiver_parity_error ? 0x04 : 0x00;
status |= m_sync_character_received ? 0x08 : 0x00;
status |= m_fill_char_transmitted ? 0x40 : 0x00;
status |= m_transmit_buffer_empty ? 0x80 : 0x00;
if (!machine().side_effects_disabled())
{
set_fill_char_transmitted(false);
set_receiver_overrun(false);
set_receiver_parity_error(false);
set_sync_character_received(false);
}
LOGREG("%s: 0x%02x\n", FUNCNAME, status);
return status;
}
void s2350_device::rx_w(int state)
{
m_serial_rx_line = state;
}
void s2350_device::receiver_restart()
{
LOGFUNC("%s\n", FUNCNAME);
set_received_data_available(false);
set_sync_character_received(false);
set_receiver_overrun(false);
set_receiver_parity_error(false);
m_sync_search_active = true;
m_serial_rx_state = 0;
m_serial_tx_state = 0;
}
void s2350_device::receive_byte(u8 data)
{
if (m_received_data_available)
{
set_receiver_overrun(true);
}
m_receiver_output_reg = data;
set_received_data_available(true);
}
void s2350_device::set_transmit_buffer_empty(bool val)
{
LOGLINE("%s - val: %d\n", FUNCNAME, val);
m_transmit_buffer_empty = val;
m_tbmt(val);
}
void s2350_device::set_fill_char_transmitted(bool val)
{
LOGLINE("%s - val: %d\n", FUNCNAME, val);
m_fill_char_transmitted = val;
m_fct(val);
}
void s2350_device::set_received_data_available(bool val)
{
LOGLINE("%s - val: %d\n", FUNCNAME, val);
m_received_data_available = val;
m_rda(val);
}
void s2350_device::set_receiver_overrun(bool val)
{
LOGLINE("%s - val: %d\n", FUNCNAME, val);
m_receiver_overrun = val;
m_ror(val);
}
void s2350_device::set_receiver_parity_error(bool val)
{
LOGLINE("%s - val: %d\n", FUNCNAME, val);
m_receiver_parity_error = val;
m_rpe(val);
}
void s2350_device::set_sync_character_received(bool val)
{
LOGLINE("%s - val: %d\n", FUNCNAME, val);
m_sync_character_received = val;
m_scr(val);
}
void s2350_device::update_receiver_shift()
{
m_receiver_sync_reg >>= 1;
m_receiver_shift_reg |= m_serial_rx_line ? 0x80 : 0x00;
}
void s2350_device::rcp_w()
{
if (m_in_sync)
{
if (m_serial_rx_state++ == 0)
{
m_receiver_shift_reg = 0;
}
update_receiver_shift();
if (m_serial_rx_state == 8)
{
receive_byte(m_receiver_shift_reg);
m_serial_rx_state = 0;
}
}
else if (m_sync_search_active)
{
LOGSYNC("%s - searching for sync\n", FUNCNAME);
update_receiver_shift();
// check for a match
if (m_receiver_sync_reg == m_receiver_shift_reg)
{
LOGSYNC("%s - sync found\n", FUNCNAME);
m_serial_rx_line = 0;
m_in_sync = true;
}
}
else
{
LOGSYNC("%s - ignoring data\n", FUNCNAME);
}
}
void s2350_device::tcp_w()
{
if (m_serial_tx_state == 0)
{
if (m_transmit_buffer_empty)
{
set_fill_char_transmitted(true);
m_transmitter_shift_reg = m_transmitter_fill_reg;
}
else
{
set_transmit_buffer_empty(false);
set_fill_char_transmitted(false);
m_transmitter_shift_reg = m_transmitter_holding_reg;
}
}
m_tx_cb(BIT(m_transmitter_shift_reg, m_serial_tx_state));
m_serial_tx_state = (m_serial_tx_state + 1) & 0x7;
}
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