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Diffstat (limited to 'src/devices/machine/am79c90.cpp')
-rw-r--r--src/devices/machine/am79c90.cpp46
1 files changed, 32 insertions, 14 deletions
diff --git a/src/devices/machine/am79c90.cpp b/src/devices/machine/am79c90.cpp
index 8c6a36221f3..c2e56692461 100644
--- a/src/devices/machine/am79c90.cpp
+++ b/src/devices/machine/am79c90.cpp
@@ -6,11 +6,10 @@
* CMOS Local Area Network Controller for Ethernet (C-LANCE).
*
* Sources:
+ * - Am7990 Local Area Network Controller for Ethernet (LANCE), Publication #05698, Rev. C, June 1990, Advanced Micro Devices
+ * - Am79C90 CMOS Local Area Network Controller for Ethernet (C-LANCE), Publication #17881, Rev. C, January 1998, Advanced Micro Devices
*
- * http://bitsavers.org/components/amd/Am7990/Am7990.pdf
- * http://bitsavers.org/components/amd/Am7990/Am79c90.pdf
- *
- * TODO
+ * TODO:
* - external loopback
* - hp9k/3xx diagnostic failures
*
@@ -64,6 +63,7 @@ am7990_device_base::am7990_device_base(const machine_config &mconfig, device_typ
, m_intr_out_cb(*this)
, m_dma_in_cb(*this, 0)
, m_dma_out_cb(*this)
+ , m_interrupt(nullptr)
, m_transmit_poll(nullptr)
, m_intr_out_state(1)
{
@@ -84,6 +84,7 @@ constexpr attotime am7990_device_base::TX_POLL_PERIOD;
void am7990_device_base::device_start()
{
+ m_interrupt = timer_alloc(FUNC(am7990_device_base::interrupt), this);
m_transmit_poll = timer_alloc(FUNC(am7990_device_base::transmit_poll), this);
m_transmit_poll->adjust(TX_POLL_PERIOD, 0, TX_POLL_PERIOD);
@@ -123,16 +124,23 @@ void am7990_device_base::device_reset()
update_interrupts();
}
-void am7990_device_base::update_interrupts()
+void am7990_device_base::interrupt(s32 param)
+{
+ m_intr_out_cb(param);
+}
+
+void am7990_device_base::update_interrupts(attotime const delay)
{
- if (m_csr[0] & CSR0_INTR)
+ if (m_csr[0] & CSR0_INEA)
{
- // assert intr if interrupts are enabled and not asserted
- if ((m_csr[0] & CSR0_INEA) && m_intr_out_state)
+ // update intr
+ if (bool(m_csr[0] & CSR0_INTR) == m_intr_out_state)
{
m_intr_out_state = !m_intr_out_state;
- m_intr_out_cb(m_intr_out_state);
- LOG("interrupt asserted\n");
+ m_interrupt->adjust(delay, m_intr_out_state);
+
+ if (!m_intr_out_state)
+ LOG("interrupt asserted\n");
}
}
else
@@ -141,7 +149,7 @@ void am7990_device_base::update_interrupts()
if (!m_intr_out_state)
{
m_intr_out_state = !m_intr_out_state;
- m_intr_out_cb(m_intr_out_state);
+ m_interrupt->adjust(delay, m_intr_out_state);
}
}
}
@@ -541,6 +549,8 @@ void am7990_device_base::regs_w(offs_t offset, u16 data)
{
LOGMASKED(LOG_REG, "regs_w csr%d data 0x%04x (%s)\n", m_rap, data, machine().describe_context());
+ attotime delay = attotime::zero;
+
switch (m_rap)
{
case 0: // Control/Status
@@ -569,7 +579,17 @@ void am7990_device_base::regs_w(offs_t offset, u16 data)
if ((data & CSR0_INIT) && !(m_csr[0] & CSR0_INIT))
{
if (m_csr[0] & CSR0_STOP)
+ {
initialize();
+
+ /*
+ * Initialization reads 12 words from the bus using single
+ * word DMA transfers. Allow 2 cycles for bus acquisition
+ * and release, plus 6 cycles for each single word DMA
+ * transfer.
+ */
+ delay = attotime::from_ticks((1 + 6 + 1) * 12, clock());
+ }
else
m_csr[0] |= m_idon ? CSR0_IDON : CSR0_INIT;
}
@@ -647,7 +667,7 @@ void am7990_device_base::regs_w(offs_t offset, u16 data)
else
m_csr[0] &= ~CSR0_INTR;
- update_interrupts();
+ update_interrupts(delay);
break;
case 1: // Least significant 15 bits of the Initialization Block
@@ -689,8 +709,6 @@ void am7990_device_base::initialize()
m_mode = init_block[0];
- set_promisc(m_mode & MODE_PROM);
-
put_u16le(&m_physical_addr[0], init_block[1]);
put_u16le(&m_physical_addr[2], init_block[2]);
put_u16le(&m_physical_addr[4], init_block[3]);