This is a collection of Intel®’ IA32® Software Developer's Manuals (URL of the day) and AMD' AMD64 Architecture Programmer's Manual together with the related specifications, application notes, white papers, and change logs. The collection aims to keep all available revisions. It was originally created by Michal Necasek, see OS/2 Museum.

If you have a public document, related to the IA32® specifications and missing from the collection, please mail it to me. The content of this URL and all sub-ULRs is available for convenient bulk download by rsync x86docs password "" (empty).

CTIINTACK

CTIINTACK, CTI Output Trigger Acknowledge register

The CTIINTACK characteristics are:

Purpose

Can be used to deactivate the output triggers.

Configuration

CTIINTACK is in the Debug power domain.

Attributes

CTIINTACK is a 32-bit register.

Field descriptions

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
ACK31	ACK30	ACK29	ACK28	ACK27	ACK26	ACK25	ACK24	ACK23	ACK22	ACK21	ACK20	ACK19	ACK18	ACK17	ACK16	ACK15	ACK14	ACK13	ACK12	ACK11	ACK10	ACK9	ACK8	ACK7	ACK6	ACK5	ACK4	ACK3	ACK2	ACK1	ACK0

ACK<n>, bit [n], for n = 31 to 0

Acknowledge for output trigger <n>.

If any of the following is true, writes to ACK<n> are ignored:

n >= CTIDEVID.NUMTRIG, the number of implemented triggers.
Output trigger n is not active.
The channel mapping function output, as controlled by CTIOUTEN<n>, is still active.

Otherwise, if any of the following are true, ACK<n> is RES0:

Output trigger n is not implemented.
Output trigger n is not connected.
Output trigger n is self-acknowledging and does not require software acknowledge.

Otherwise, the behavior on writes to ACK<n> is as follows:

ACK<n>	Meaning
0b0	No effect
0b1	Deactivate the trigger.

Accessing this field has the following behavior:

When n >= UInt(CTIDEVID.NUMTRIG), access to this field is RAZ/WI.
Otherwise, access to this field is WO/UNKNOWN.

Accessing CTIINTACK

A debugger must read CTITRIGOUTSTATUS to confirm that the output trigger has been acknowledged before generating any event that must be ordered after the write to CTIINTACK, such as a write to CTIAPPPULSE to activate another trigger.

CTIINTACK can be accessed through the external debug interface:

Component	Offset	Instance
CTI	0x010	CTIINTACK

Accessible as follows:

When SoftwareLockStatus(addrdesc), accesses to this register are WI.
Otherwise, accesses to this register are WO.

2026-03-26 20:27:25, 2026-03_rel