TSB12LV21A

(PCILynx) IEEE 1394-1995 BUS TO PCI BUS INTERFACE

SLLS273 – APRIL 1997

2

POST OFFICE BOX 655303

description (continued)

The RAM, ROM, AUX, ZV, and general purpose I/O (GPIO) ports collectively implement the local bus interface.

These ports are mapped into the PCI address can be accessed either through the PCI bus or internal DMA

transactions. Internal transactions do not appear on the external PCI bus, thereby conserving PCI bandwidth.

DMA packet control lists or other data that may be stored in external RAM or ROM attached to the local bus

interface. This further reduces PCI use and generally improves performance. The ZV local bus port is designed

to transfer data from 1394 video devices to an external device connected to the PCILynx ZV port. This interface

provides a method of receiving 1394 digital camera packets directly to a ZV-compliant device attached to the

local bus interface.

Built-in test registers, a dedicated test output terminal, and four GPIO terminals allow observation of internal

states and provides a convenient software debug capability. Programmable interrupts are available to inform

driver software of important events such as 1394 bus resets and DMA-to-PCL transfer completion.

The 3.3-V internal operation provides reduced power consumption while maintaining compatibility with 5-V

signaling environments. The PCI interface is compatible with both 3-V and 5-V PCI systems.