diff options
Diffstat (limited to 'sv/soc/irq')
| -rw-r--r-- | sv/soc/irq/images/irq.png | bin | 0 -> 10991 bytes | |||
| -rw-r--r-- | sv/soc/irq/irqchip.md | 9 |
2 files changed, 9 insertions, 0 deletions
diff --git a/sv/soc/irq/images/irq.png b/sv/soc/irq/images/irq.png Binary files differnew file mode 100644 index 0000000..3550d00 --- /dev/null +++ b/sv/soc/irq/images/irq.png diff --git a/sv/soc/irq/irqchip.md b/sv/soc/irq/irqchip.md index 9e9b595..e4705a7 100644 --- a/sv/soc/irq/irqchip.md +++ b/sv/soc/irq/irqchip.md @@ -29,3 +29,12 @@ by pulsing IRQACK high for at least 2 ms. As soon as a rising edge of the PIMC CLK signal occurs with IRQACK pulled high, NOTIFY# is pulled high and LINENO[7:0] becomes zero. + +## Signalling + +When a peripheral needs to signal an event, it pulses its IRQ line high for 1 ms which results in +NOTIFY# being pulled low and LINENO[7:0] set to the source line number. After an IRQ has been handled, +it can be acknowledged by pulsing IRQACK high for 2 ms. After an IRQ has been acknowledged, NOTIFY# +is pulled high and LINENO[7:0] is cleared to zero. + + |
