GICD_CLRSPI_NSR, Clear Non-secure SPI Pending Register

The GICD_CLRSPI_NSR characteristics are:

Purpose

Removes the pending state from a valid SPI if permitted by the Security state of the access and the GICD_NSACR<n> value for that SPI.

A write to this register changes the state of a pending SPI to inactive, and the state of an active and pending SPI to active.

If GICD_TYPER.MBIS == 0, this register is reserved.

When GICD_CTLR.DS == 1, this register provides functionality for all SPIs.

GICD_CLRSPI_NSR is a 32-bit register.

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0																			INTID

Reserved, RES0.

The INTID of the SPI.

The function of this register depends on whether the targeted SPI is configured to be an edge-triggered or level-sensitive interrupt:

For an edge-triggered interrupt, a write to GICD_SETSPI_NSR or GICD_SETSPI_SR adds the pending state to the targeted interrupt. It will stop being pending on activation, or if the pending state is removed by a write to GICD_CLRSPI_NSR, GICD_CLRSPI_SR, or GICD_ICPENDR<n>.
For a level-sensitive interrupt, a write to GICD_SETSPI_NSR or GICD_SETSPI_SR adds the pending state to the targeted interrupt. It will remain pending until it is deasserted by a write to GICD_CLRSPI_NSR or GICD_CLRSPI_SR. If the interrupt is activated between having the pending state added and being deactivated, then the interrupt will be active and pending.

Writes to this register have no effect if:

The value written specifies a Secure SPI, the value is written by a Non-secure access, and the value of the corresponding GICD_NSACR<n> register is less than 0b10.
The value written specifies an invalid SPI.
The SPI is not pending.

16-bit accesses to bits [15:0] of this register must be supported.

Note

A Secure access to this register can clear the pending state of any valid SPI.

Component	Frame	Offset	Instance
GIC Distributor	Dist_base	0x0048	GICD_CLRSPI_NSR

Accesses to this register are WO.

15/12/2024 22:27; 5e0a212688c6bd7aee92394b6f5e491b4d0fee1d