Advantech FWA-2320 User Manual page 37

3. HPET
The High Precision Event Timer (HPET) provides a set of timers that are used by the
operating system for timing events. One timer block is implemented, containing one
counter and three timers. It complies with the IA-PC HPET (High Precision Event
Timers) Specification, Revision 1.0 available from intel.
4. SMBus
The PCH integrates two SMBus controllers. The first one is used as interface to
external devices such as EEPROMs, the hardware monitor; the second controller is
not used on the FWA-2320.
Table 2.15: SMBus Devices
SMBus Adr,
0 0x5C/5D
0 0xA0/A1
0 0xA2/A3
0 0xAC/AD
0 0xAE/AF
0 0xD2/D3
Most of the SMBus devices are only accessed by BIOS at system start up to deter-
mine and set system configuration. Tampering with these devices may lead to system
instability and malfunction.
Information on the hardware monitor and how to access it is provided in section
2.4.9.
Information reg. the FRU EEPROM can be found in section 2.4.9.1.
5. Interrupt Controllers
The PCH contains two cascaded, legacy 8259 interrupt controllers as well as an IO
Advanced APIC. Legacy Interrupts can also be generated via the LPC Bus using the
Serial IRQ mechanism.
The PCH interrupt controllers forward the interrupt requests to the local APIC inte-
grated with the CPU either as out of band INT# requests or MSI/MSI-X in band mes-
sages. For more details on the iA interrupt architecture, please refer to
documentation available from intel.
2.4.5.4 QuickAssist Accelerator
QuickAssist is used by applications running on the IA cores to accelerate and offload
processing. The integrated QuickAssist accelerator appears to software as a PCIe
endpoint and is used as a look-aside coprocessor. It supports the features below:

Symmetric Cryptographic Functions
– Cipher Operations
– Hash/Authenticate Operation
– Cipher-Hash Combined Operation
– Key Derivation Operation

Public Key Functions
– RSA Operation
– Diffie-Helman Operation
– Digital Signature Standard Operation
Device
NCT7904D
DIMM A0 SPD
DIMM A1 SPD
24C02
24C02 (reserved)
CK420BQ
27
Function
Hardware monitor chip
SPD EEPROM
SPD EEPROM
System FRU EEPROM
Reserved for FRU EEPROM
on PCIe expansion card
Clock generator
FWA-2320 User Manual