FW82801DBM

The 82801DBM  is a kind of I/O controller hub 4 mobile (ICH4-M). The ICH4 includes a variety of PCI functions that are divided into three logical devices (29, 30, and 31) on PCI Bus 0 and one device on Bus 1. Device 30 is the Hub Interface-To-PCI bridge. 82801DBM contains all the other PCI functions, except the USB Controllers and the LAN Controller. The LAN controller is located on Bus 1.

There are some features of 82801DBM as follows. First is PCI bus interface which supports up to 6 master devices on PC. The second is integrated LAN controller which is compliant with aWfM 2.0 and IEEE 802.3. Then is integrated IDE controller which supports "native mode" register and interrupts. The fifth is interrupt controller which supports PCI 2.2 message signaled interrupts. The sixth is external glue integration. The seventh is low pin count (LPC) interface which supports two Master/DMA devices. The eighth is real-time clock. The last one is system TCO reduction circuits.

What comes next is about the absolute maximum ratings of 82801DBM. The voltage on any 3.3 V Pin with respect to ground is from -0.5 to Vcc3_3 + 0.5 V. The voltage on any 5 V tolerant pin with respect to ground (VREF=5V) is from -0.5 to VREF +0.5 V. The 1.5 V supply voltage with respect to Vss is from -0.5 to +2.1 V. The 1.8 V supply voltage with respect to Vss is from -0.5 to +2.1 V. The 3.3 V supply voltage with respect to Vss is from -0.5 to +4.6 V. The 5.0 V supply voltage (Vref) with respect to Vss is from -0.5 to +5.5 V.