diff options
| author | Ian Moffett <ian@osmora.org> | 2024-08-03 15:24:45 -0400 |
|---|---|---|
| committer | Ian Moffett <ian@osmora.org> | 2024-08-03 15:24:45 -0400 |
| commit | 109d9dc7e6362c3cd81f7e37604ab9663ac96848 (patch) | |
| tree | f7280339ff467a61db0284bc171ba45c7f825dda /sv/soc/irq/irqchip.md | |
| parent | 04c59c82632e7c6cf45b5fb952364ff39835d513 (diff) | |
soc: pimc: Describe IRQ signalling
Signed-off-by: Ian Moffett <ian@osmora.org>
Diffstat (limited to 'sv/soc/irq/irqchip.md')
| -rw-r--r-- | sv/soc/irq/irqchip.md | 9 |
1 files changed, 9 insertions, 0 deletions
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. + + |