Datasheet

LPC Interface Bridge Registers (D31:F0)
278 Intel® Xeon® Processor D-1500 Product Family
Datasheet - Volume 1 of 4: Integrated Platform Controller Hub
March 2015
001 = Lowest Priority. Deliver the signal on the INTR signal of the processor core that is executing
at the lowest priority among all the processors listed in the specified destination. Trigger
Mode can be edge or level.
010 = SMI (System Management Interrupt). Requires the interrupt to be programmed as edge
triggered. The vector information is ignored but must be programmed to all 0s for future
compatibility: not supported
011 = Reserved
100 = NMI. Deliver the signal on the NMI signal of all processor cores listed in the destination.
Vector information is ignored. NMI is treated as an edge triggered interrupt even if it is
programmed as level triggered. For proper operation this redirection table entry must be
programmed to edge triggered. The NMI delivery mode does not set the RIRR bit. If the
redirection table is incorrectly set to level, the loop count will continue counting through the
redirection table addresses. Once the count for the NMI pin is reached again, the interrupt
will be sent again: not supported
101 = INIT. Deliver the signal to all processor cores listed in the destination by asserting the INIT
signal. All addressed local APICs will assume their INIT state. INIT is always treated as an
edge triggered interrupt even if programmed as level triggered. For proper operation this
redirection table entry must be programmed to edge triggered. The INIT delivery mode
does not set the RIRR bit. If the redirection table is incorrectly set to level, the loop count
will continue counting through the redirection table addresses. Once the count for the INIT
pin is reached again, the interrupt will be sent again: not supported
110 = Reserved
111 = ExtINT. Deliver the signal to the INTR signal of all processor cores listed in the destination
as an interrupt that originated in an externally connected 8259A compatible interrupt
controller. The INTA cycle that corresponds to this ExtINT delivery will be routed to the
external controller that is expected to supply the vector. Requires the interrupt to be
programmed as edge triggered.
7.6 Real Time Clock Registers
7.6.1 I/O Register Address Map
The RTC internal registers and RAM are organized as two banks of 128 bytes each,
called the standard and extended banks. The first 14 bytes of the standard bank
contain the RTC time and date information along with four registers, A–D, that are used
for configuration of the RTC. The extended bank contains a full 128 bytes of battery
backed SRAM, and will be accessible even when the RTC module is disabled (using the
RTC configuration register). Registers A–D do not physically exist in the RAM.
All data movement between the host processor and the real-time clock is done through
registers mapped to the standard I/O space. The register map is shown in Tab le 7 - 6 .
Notes:
1. I/O locations 70h and 71h are the standard legacy location for the real-time clock.
The map for this bank is shown in Tabl e 7- 7 . Locations 72h and 73h are for
accessing the extended RAM. The extended RAM bank is also accessed using an
indexed scheme. I/O address 72h is used as the address pointer and I/O address
Table 7-6. RTC I/O Registers
I/O
Locations
If U128E bit = 0 Function
70h and 74h Also alias to 72h and 76h Real-Time Clock (Standard RAM) Index Register
71h and 75h Also alias to 73h and 77h Real-Time Clock (Standard RAM) Target Register
72h and 76h Extended RAM Index Register (if enabled)
73h and 77h Extended RAM Target Register (if enabled)