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https://github.com/holub/mame
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ncr5385: single byte transfers
This commit is contained in:
Patrick Mackinlay
parent
7f2b2421da
commit
af7dadd745
@ -9,7 +9,6 @@
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* - NCR SCSI Engineering Notebook, 1984, NCR Microelectronics
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*
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* TODO:
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* - single byte transfer
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* - target mode send/receive
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* - disconnect/reselection
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*/
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@ -130,8 +129,9 @@ void ncr5385_device::device_start()
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save_item(NAME(m_cnt));
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save_item(NAME(m_state));
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save_item(NAME(m_xfi_phase));
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save_item(NAME(m_phase));
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save_item(NAME(m_mode));
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save_item(NAME(m_sbx));
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save_item(NAME(m_int_state));
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save_item(NAME(m_dreq_state));
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@ -154,6 +154,7 @@ void ncr5385_device::device_reset()
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m_state = IDLE;
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m_mode = DISCONNECTED;
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m_sbx = false;
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// monitor all control lines
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scsi_bus->ctrl_wait(scsi_refid, S_ALL, S_ALL);
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@ -207,7 +208,12 @@ void ncr5385_device::map(address_map &map)
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u8 ncr5385_device::dat_r()
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{
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if (m_aux_status & AUX_STATUS_DATA_FULL)
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{
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m_aux_status &= ~AUX_STATUS_DATA_FULL;
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if (m_state != IDLE)
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m_state_timer->adjust(attotime::zero);
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}
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else
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logerror("data register empty (%s)\n", machine().describe_context());
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@ -390,13 +396,21 @@ void ncr5385_device::cmd_w(u8 data)
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LOGMASKED(LOG_COMMAND, "send unspecified info in\n");
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break;
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case 0x14: // transfer info
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LOGMASKED(LOG_COMMAND, "transfer info (count=%d)\n", m_cnt);
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if (data & CMD_SBX)
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LOGMASKED(LOG_COMMAND, "transfer info (%s, single byte)\n", (data & CMD_DMA) ? "dma" : "pio");
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else
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LOGMASKED(LOG_COMMAND, "transfer info (%s, count=%d)\n", (data & CMD_DMA) ? "dma" : "pio", m_cnt);
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m_state = XFI_START;
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m_sbx = data & CMD_SBX;
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m_state_timer->adjust(attotime::zero);
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break;
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case 0x15: // transfer pad
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LOGMASKED(LOG_COMMAND, "transfer pad (count=%d)\n", m_cnt);
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if (data & CMD_SBX)
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LOGMASKED(LOG_COMMAND, "transfer pad (%s, single byte)\n", (data & CMD_DMA) ? "dma" : "pio");
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else
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LOGMASKED(LOG_COMMAND, "transfer pad (%s, count=%d)\n", (data & CMD_DMA) ? "dma" : "pio", m_cnt);
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m_state = XFI_START;
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m_sbx = data & CMD_SBX;
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m_state_timer->adjust(attotime::zero);
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break;
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case 0x16: case 0x17:
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@ -424,6 +438,11 @@ void ncr5385_device::dst_id_w(u8 data)
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template <unsigned N> void ncr5385_device::cnt_w(u8 data)
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{
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m_cnt = (m_cnt & ~(u32(0xff) << (N * 8))) | (u32(data) << (N * 8));
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if (m_cnt)
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m_aux_status &= ~AUX_STATUS_TC_ZERO;
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else
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m_aux_status |= AUX_STATUS_TC_ZERO;
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}
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void ncr5385_device::tst_w(u8 data)
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@ -595,19 +614,19 @@ int ncr5385_device::state_step()
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break;
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case XFI_START:
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m_xfi_phase = ctrl & S_PHASE_MASK;
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m_phase = ctrl & S_PHASE_MASK;
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m_state = (ctrl & S_INP) ? XFI_IN_REQ : XFI_OUT_REQ;
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break;
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case XFI_IN_REQ:
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// TODO: single byte transfer, disconnect
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// TODO: disconnect
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if (ctrl & S_REQ)
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{
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if (m_cnt && (ctrl & S_PHASE_MASK) == m_xfi_phase)
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if (remaining() && (ctrl & S_PHASE_MASK) == m_phase)
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{
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m_state = XFI_IN_DRQ;
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// no data transferred and no dma used by transfer pad command
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// transfer pad in doesn't transfer any data
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if (!BIT(m_cmd, 0))
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{
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m_aux_status |= AUX_STATUS_DATA_FULL;
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@ -621,7 +640,7 @@ int ncr5385_device::state_step()
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}
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else
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{
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LOGMASKED(LOG_STATE, "xfi_in: %s\n", m_cnt ? "phase change" : "transfer complete");
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LOGMASKED(LOG_STATE, "xfi_in: %s\n", remaining() ? "phase change" : "transfer complete");
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m_int_status |= INT_BUS_SERVICE;
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m_state = IDLE;
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@ -643,18 +662,20 @@ int ncr5385_device::state_step()
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{
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m_state = XFI_IN_REQ;
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if ((m_cmd & CMD_DMA) && !(m_cmd & CMD_SBX))
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if (!(m_cmd & CMD_SBX))
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{
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m_cnt--;
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LOGMASKED(LOG_DMA, "xfi_in: %d remaining\n", m_cnt);
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LOGMASKED(LOG_STATE, "xfi_in: %d remaining\n", m_cnt);
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if (!m_cnt)
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m_aux_status |= AUX_STATUS_TC_ZERO;
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}
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else
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m_sbx = false;
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// clear ACK except after last byte of message input phase
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if ((m_cnt == 0) && (ctrl & S_PHASE_MASK) == S_PHASE_MSG_IN)
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if (!remaining() && (ctrl & S_PHASE_MASK) == S_PHASE_MSG_IN)
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{
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m_int_status |= INT_FUNC_COMPLETE;
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m_state = IDLE;
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@ -669,11 +690,12 @@ int ncr5385_device::state_step()
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case XFI_OUT_REQ:
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if (ctrl & S_REQ)
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{
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// TODO: single byte transfer, disconnect
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if (m_cnt && (ctrl & S_PHASE_MASK) == m_xfi_phase)
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// TODO: disconnect
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if (remaining() && (ctrl & S_PHASE_MASK) == m_phase)
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{
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m_state = XFI_OUT_DRQ;
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// FIXME: only one byte dma for transfer pad
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if (m_cmd & CMD_DMA)
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set_dreq(true);
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@ -681,7 +703,7 @@ int ncr5385_device::state_step()
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}
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else
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{
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LOGMASKED(LOG_STATE, "xfi_out: %s\n", m_cnt ? "phase change" : "transfer complete");
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LOGMASKED(LOG_STATE, "xfi_out: %s\n", remaining() ? "phase change" : "transfer complete");
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m_int_status |= INT_BUS_SERVICE;
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m_state = IDLE;
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@ -697,7 +719,7 @@ int ncr5385_device::state_step()
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// assert data and ACK
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scsi_bus->data_w(scsi_refid, m_dat);
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if ((m_cnt == 1) && (ctrl & S_PHASE_MASK) == S_PHASE_MSG_OUT)
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if (remaining(1) && (ctrl & S_PHASE_MASK) == S_PHASE_MSG_OUT)
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scsi_bus->ctrl_w(scsi_refid, S_ACK, S_ACK | S_ATN);
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else
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scsi_bus->ctrl_w(scsi_refid, S_ACK, S_ACK);
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@ -705,17 +727,22 @@ int ncr5385_device::state_step()
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case XFI_OUT_ACK:
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if (!(ctrl & S_REQ))
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{
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m_state = BIT(m_cmd, 0) ? XFI_OUT_PAD : XFI_OUT_REQ;
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if (BIT(m_cmd, 0))
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m_state = XFI_OUT_PAD;
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else
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m_state = XFI_OUT_REQ;
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if ((m_cmd & CMD_DMA) && !(m_cmd & CMD_SBX))
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if (!(m_cmd & CMD_SBX))
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{
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m_cnt--;
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LOGMASKED(LOG_DMA, "xfi_out: %d remaining\n", m_cnt);
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LOGMASKED(LOG_STATE, "xfi_out: %d remaining\n", m_cnt);
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if (!m_cnt)
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m_aux_status |= AUX_STATUS_TC_ZERO;
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}
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else
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m_sbx = false;
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// clear data and ACK
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scsi_bus->data_w(scsi_refid, 0);
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@ -725,12 +752,12 @@ int ncr5385_device::state_step()
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case XFI_OUT_PAD:
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if (ctrl & S_REQ)
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{
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// TODO: single byte transfer, disconnect
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if (m_cnt && (ctrl & S_PHASE_MASK) == m_xfi_phase)
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// TODO: disconnect
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if (remaining() && (ctrl & S_PHASE_MASK) == m_phase)
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m_state = XFI_OUT_DRQ;
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else
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{
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LOGMASKED(LOG_STATE, "xfi_out: %s\n", m_cnt ? "phase change" : "transfer complete");
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LOGMASKED(LOG_STATE, "xfi_out: %s\n", remaining() ? "phase change" : "transfer complete");
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m_int_status |= INT_BUS_SERVICE;
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m_state = IDLE;
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@ -743,6 +770,23 @@ int ncr5385_device::state_step()
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return delay;
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}
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/*
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* Returns a boolean indicating whether any data remains to be transferred:
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*
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* - for single byte transfer commands, m_sbx indicates data remaining
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* - alternatively, return if there's a specific amount of data to transfer
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* - otherwise, check if there's any data to transfer
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*/
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bool ncr5385_device::remaining(u32 const count) const
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{
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if (m_cmd & CMD_SBX)
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return m_sbx;
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else if (count)
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return m_cnt == count;
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else
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return m_cnt;
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}
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void ncr5385_device::set_dreq(bool dreq)
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{
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if (m_dreq_state != dreq)
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@ -89,6 +89,7 @@ protected:
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// state machine, interrupts and dma
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void state_timer(s32 param);
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int state_step();
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bool remaining(u32 const count = 0) const;
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void update_int();
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void set_dreq(bool dreq);
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@ -112,8 +113,9 @@ private:
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// other state
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u32 m_state;
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u8 m_xfi_phase;
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u8 m_phase;
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u8 m_mode;
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bool m_sbx;
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bool m_int_state;
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bool m_dreq_state;
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