The Texas Instruments PCI1520, a 208-terminal dual-slot CardBus controller designed to meet the _PCI Bus Power Management Interface Specification for PCI to CardBus Bridges_, is an ultralow-power high-performance PCI-to-CardBus controller that supports two independent card sockets compliant with the _PC Card Standard_ (rev. 7.1). The PCI1520 provides features that make it the best choice for bridging between PCI and PC Cards in both notebook and desktop computers. The _1997 PC Card Standard_ retains the 16-bit PC Card specification defined in _PCI Local Bus Specification_ and defines the new 32-bit PC Card, CardBus, capable of full 32-bit data transfers at 33 MHz. The PCI1520 supports any combination of 16-bit and CardBus PC Cards in the two sockets, powered at 5 V or 3.3 V, as required.
The PCI1520 is compliant with the _PCI Local Bus Specification_, and its PCI interface can act as either a PCI master device or a PCI slave device. The PCI bus mastering is initiated during CardBus PC Card bridging transactions. The PCI1520 is also compliant with _PCI Bus Power Management Interface Specification_ (rev. 1.1).
All card signals are internally buffered to allow hot insertion and removal without external buffering. The PCI1520 is register-compatible with the Intel 82365SL-DF and 82365SL ExCA controllers. The PCI1520 internal data path logic allows the host to access 8-, 16-, and 32-bit cards using full 32-bit PCI cycles for maximum performance. Independent buffering and a pipeline architecture provide an unsurpassed performance level with sustained bursting. The PCI1520 can also be programmed to accept fast posted writes to improve system-bus utilization.
Multiple system-interrupt signaling options are provided, including parallel PCI, parallel ISA, serialized ISA, and serialized PCI. Furthermore, general-purpose inputs and outputs are provided for the board designer to implement sideband functions. Many other features designed into the PCI1520, such as socket activity light-emitting diode (LED) outputs, are discussed in detail throughout the design specification.
An advanced complementary metal-oxide semiconductor (CMOS) process achieves low system power consumption while operating at PCI clock rates up to 33 MHz. Several low-power modes enable the host power management system to further reduce power consumption.
A 208-terminal low-profile QFP (PDV) or 209-terminal MicroStar BGA ball-grid array (GHK) package
2.5-V core logic and 3.3-V I/O with universal PCI interfaces compatible with 3.3-V and 5-V PCI signaling environments
Integrated low-dropout voltage regulator (LDO-VR) eliminates the need for an external 2.5-V power supply
Mix-and-match 5-V/3.3-V 16-bit PC Cards and 3.3-V CardBus Cards
Two PC Card or CardBus slots with hot insertion and removal
Serial interface to TI TPS222X dual-slot PC Card power switch
Burst transfers to maximize data throughput with CardBus Cards
Interrupt configurations: parallel PCI, serialized PCI, parallel ISA, and serialized ISA
Serial EEPROM interface for loading subsystem ID and subsystem vendor ID
Pipelined architecture for greater than 130-Mbps throughput from CardBus-to-PCI and from PCI-to-CardBus
Up to five general-purpose I/Os
Programmable output select for CLKRUN\
Multifunction PCI device with separate configuration space for each socket
Five PCI memory windows and two I/O windows available for each 16-bit interface
Two I/O windows and two memory windows available to each CardBus socket
Exchangeable-card-architecture- (ExCA-) compatible registers are mapped in memory and I/O space
Intel 82365SL-DF and 82365SL register compatible
Ring indicate, SUSPEND\, PCI CLKRUN\, and CardBus CCLKRUN\
