Host Control Scheduler (HOST_CTRL_SCH_REG) – Offset 8094 - 001 - ID:834576 | Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2

Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2

ID	Date	Version	Classification
834576	10/10/2024	001	Public

Host Control Scheduler (HOST_CTRL_SCH_REG) – Offset 8094

Host Control Scheduler

Bit Range	Default	Access	Field Name and Description
31	0h	RW	Disable repeat scheduler service of usb2 periodic (SCH_USB2_PRDC) Disable repeat scheduler service of usb2 periodic
30:27	0h	RW	Enable scheduler limiter functions to block async. traffic types across ports while periodic pending (SCH_BLOCK_ASYNC) Enable scheduler limiter functions to block async. traffic types across ports while periodic pending
26	0h	RW	Enable pkt pending notification to usb3 ports (EN_PP_NTFC_USB3) Enable pkt pending notification to usb3 ports
25	0h	RW	disable async. burst limitation while periodic in progress (DIS_ASYNC_BURST) disable async. burst limitation while periodic in progress
24	0h	RW	Disable marking overlap flag on all TT periodic INs. (DIS_OVERLAP_TT_PERIODIC) Disable marking overlap flag on all TT periodic INs.
23	1h	RW	disable blocking of async. scheduling while periodic active to same port (DIS_BLOCK_ASYNC_PER_ACT) disable blocking of async. scheduling while periodic active to same port
22	1h	RW	Setting this bit enables pipelining of multiple OUT EPs (EN_PIPELINE_MULTIPLE_OUT) Setting this bit enables pipelining of multiple OUT EPs (across diff ports). This will help boost the performance for multiple ports OUT test case
21	0h	RW	Enable stop serving packets to disabled port (EN_STOP_SERVE_DIS_PORT) Enable stop serving packets to disabled port
20:17	0h	RW	TTE Host Control (TTE_HOST_CTRL) (0): disable interrupt complete split limit to 3 microframes (1): disable checking of missed microframes (2): disable split error request w/NULL pointer on speculative INs with data payload and no TRB. (3): disable deferred split error request on speculative IN with data payload and no TRB. (7:4): reserved
16	0h	RW	disable deferred split error request on speculative IN with data payload and no TRB. (DIS_DEFFER_SPLIT_ERR) disable deferred split error request on speculative IN with data payload and no TRB.
15	1h	RW	TTE: disable split error request w/NULL pointer on speculative INs with data payload and no TRB. (TTE_DIS_SPLIT_ERR_IN_DATA_NO_TRB) TTE: disable split error request w/NULL pointer on speculative INs with data payload and no TRB.
14	1h	RW	TTE: Disable checking of missed microframes (DIS_MISSED_UFRAME_CHECK) TTE: Disable checking of missed microframes
13	1h	RW	TTE: Disable interrupt complete split limit to 3 micro frames (DIS_INTER_SPLIT_LIMIT) TTE: Disable interrupt complete split limit to 3 micro frames
12:11	0h	RW	Cache Size Control Reg (CACHE_SZ_CTRL) 0: 64 1: 32 2,3: 16
10:9	0h	RW	Maximum EP Per Slot (MAX_EP_SLOT) 0: 32 1: 16 2: 8 3: 4
8	1h	RW	Turn on scratch_pad_en (TO_SCRATCH_PAD_EN) Cmd Mgr: Enables scratch pad function
7	0h	RW	Scheduler Host Control Reg (STOP_SCH_UNCON) enable check to stop scheduling on port that are not connected
6	1h	RW	disable 1 pack scheduling limit when ISO pending in present microframe (DIS_SCH_LIMIT) disable 1 pack scheduling limit when ISO pending in present microframe
5:4	0h	RW	scheduler sort pattern (SCH_SORT_PATTERN) 00 (default) search ISO ahead of interrupt within each service interval 01 - search USB2-ISO, USB3-ISO, USB2-Interrupt, USB3-Interrupt within each service interval 10 - search strictly by interval 11 - search all ISO intervals ahead interrupt intervals and within each interval, USB2 ahead of USB3
3	0h	RW	enable TTE overlap prevention on interrupt OUT EPs (at cost of possible service interval slip (EN_TTE_OVERLAP_PREV_OUT) enable TTE overlap prevention on interrupt OUT EPs (at cost of possible service interval slip
2	0h	RW	enable TTE overlap prevention on interrupt IN EPs (at cost of possible service interval slip (EN_TTE_OVERLAP_PREV_IN) enable TTE overlap prevention on interrupt IN EPs (at cost of possible service interval slip
1	0h	RW	Disable TRM active IN EP valid check function (DIS_TRM_ACT_IN_VALID) Disable TRM active IN EP valid check function
0	0h	RW	Disable poll delay function (DIS_POLL_DELAY) Scheduler: Disable poll delay function