Major Chips Description 2-57
2.6.2 Architecture
The Texas Instruments PCI1131 is a high-performance PCI-to-PC Card controller that supports
two independent PC Card sockets compliant with the1995 PC Card Standard. The PCI1131
provides a rich set of features which make it the best choice for bridging between PCI and PC
Cards in both notebook and desktop computers. The 1995 PC Card Standard retains the 16-bit PC
Card specification defined in PCMCIA Release 2.1, and defines the new 32-bit PC Card, called
CardBus, capable of full 32-bit data transfers at 33 MHz. The PCI1131 supports any combination
of 16-bit and CardBus PC Cards in its two sockets powered at 5V or 3.3V as required.
The PCI1131 is compliant with the PCI Local Bus Specification Revision 2.1, and its PCI interface
can act as either a PCI master device or a PCI slave device. The PCI bus mastering is initiated
during 16-bit PC Card DMA transfers or CardBus PC Card bus mastering cycles.
All card signals are internally buffered to allow hot insertion and removal without external
buffering. The PCI1131 is register compatible with the Intel 82365SL-DF ExCA controller. The
PCI1131 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, 32-bit write buffers allow fast posted writes to
improve system-bus utilization.
An advanced CMOS process is used to achieve low system power consumption while operating at
PCI clock rates up to 33 MHz. Several low-power modes allow the host power management
system to further reduce power consumption.
All unused PCI1131 pins should be pulled high with 43k ohm pull-up resistors.
2.6.3 Features
• 3.3-V Core Logic With Universal PCI Interface Compatible and 3.3-V or 5-V PCI Signaling
Environments
• Supports PCI Local Bus Specification 2.1
• Mix and Match 5W3.3V PC Card16 Cards and 3.3V CardBus Cards
• Supports Two PC Card ™ or CardBus Slots With Hot Insertion and Removal
• 1995 PC Card Standard Compliant
• Advanced Submicron, Low-Power CMOS Technology
• Uses Serial Interface to Tl TPS2206A Dual Power Switch
• System Interrupts may be Programmed as PCI-style or ISA IRQ-style Interrupts
• ISA IRQ interrupts may be Serialized onto a Single IRQSER Pin
• Programmable Output Select for CLKRUN#
• Supports Burst Transfers to Maximize Data Through put on the PCI and CardBus Bus