82NM10 Datasheet, PDF (39/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

Introduction
Compatibility Modules (DMA Controller, Timer/Counters, Interrupt Controller)
The DMA controller incorporates the logic of two 82C37 DMA controllers, with seven
independently programmable channels. Channels 0–3 are hardwired to 8-bit, count-by-
byte transfers, and channels 5–7 are hardwired to 16-bit, count-by-word transfers. Any
two of the seven DMA channels can be programmed to support fast Type-F transfers.
Intel NM10 Express Chipset supports LPC DMA, which is similar to ISA DMA, through
Chipset's DMA controller. LPC DMA is handled through the use of the LDRQ# lines from
peripherals and special encoding on LAD[3:0] from the host. Single, Demand, Verify,
and Increment modes are supported on the LPC interface. Channels 0–3 are 8-bit
channels. Channels 5–7 are 16-bit channels. Channel 4 is reserved as a generic bus
master request.
The timer/counter block contains three counters that are equivalent in function to those
found in one 82C54 programmable interval timer. These three counters are combined
to provide the system timer function, and speaker tone. The 14.31818 MHz oscillator
input provides the clock source for these three counters.
Intel NM10 Express Chipset provides an ISA-Compatible Programmable Interrupt
Controller (PIC) that incorporates the functionality of two, 82C59 interrupt controllers.
The two interrupt controllers are cascaded so that 14 external and two internal
interrupts are possible. In addition, this chipset supports a serial interrupt scheme.
All of the registers in these modules can be read and restored. This is required to save
and restore system state after power has been removed and restored to the platform.
Advanced Programmable Interrupt Controller (APIC)
In addition to the standard ISA compatible Programmable Interrupt controller (PIC)
described in the previous section, this chipset incorporates the Advanced
Programmable Interrupt Controller (APIC).
Universal Serial Bus (USB) Controller
Intel NM10 Express Chipset contains an Enhanced Host Controller Interface (EHCI) host
controller that supports USB high-speed signaling. High-speed USB 2.0 allows data
transfers up to 480 Mb/s which is 40 times faster than full-speed USB. This chipset also
contains four Universal Host Controller Interface (UHCI) controllers that support USB
full-speed and low-speed signaling.
Intel NM10 Express Chipset supports eight USB 2.0 ports. All eight ports are high-
speed, full-speed, and low-speed capable. This chipset's port-routing logic determines
whether a USB port is controlled by one of the UHCI controllers or by the EHCI
controller. See Section 5.18 and Section 5.19 for details.
Datasheet
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