Description:

82439HX (TXC)

The Intel 430HX PCIset, consisting of the 82439HX System Controller (TXC). Here are some key points about the Intel 430HX chipset:

Processor Support:

• Supports all 3V Pentium® processors.
• Dual processor support, allowing for a dual-processor configuration.

PCI 2.1 Compliance:

• Compliant with PCI 2.1 specifications, ensuring compatibility with peripheral devices and expansion cards.

Integrated Second-Level Cache Controller:

• Features an integrated second-level cache controller with a direct-mapped organization.
• Offers a write-back cache policy for efficient data handling.
• Supports cache sizes of 256 KB and 512 KB.
• Utilizes pipelined burst SRAMs for cache operations.
• Provides cache hit read/write cycle timings at 3-1-1-1.
• Supports back-to-back read cycles at 3-1-1-1-1-1-1-1.
• Integrated Tag/Valid Status Bits for improved cost-effectiveness and performance.
• Optional 512-MB DRAM Cacheability Limit.

Integrated DRAM Controller:

• Supports main memory sizes ranging from 4 MB to 512 MB.
• Compatible with 64-Mb DRAM technology.
• Includes an 8-QWord deep merging DRAM write buffer.
• Enhanced EDO/Hyper Page Mode DRAM support with various read and write timings.
• Provides 8 RAS lines for memory addressing.
• Features integrated programmable-strength memory address buffers.
• Supports CAS-Before-RAS refresh.

Optional Error Checking and Correction (ECC):

• Supports error checking and correction (ECC) for superior DRAM data integrity.
• Offers single-bit error correction, multi-bit error detection, and nibble failure detection ECC code.
• Provides single and multi-bit error reporting.
• Allows for virtual swappable bank support.

PCI Bus Interface:

• Features a fully synchronous PCI bus interface.
• Offers minimum latency with 25/30/33 MHz PCI bus operation.
• Zero-wait state CPU-to-PCI write timings for enhanced graphics performance.
• Enhanced CPU-to-PCI read latencies for improved graphics and PIO (Programmed Input/Output) performance.
• Includes a 21-DWord PCI-DRAM post buffer.
• Utilizes a 22-DWord PCI-to-DRAM read prefetch buffer.
• Supports write-back merging for PCI-to-DRAM writes and write-back forwarding for PCI-to-DRAM reads.
• Includes a pipelined snoop-ahead mechanism for optimized data retrieval.
• Features a multi-transaction timer to support multiple short PCI transactions within the same PCI arbitration cycle.

Optional Kits:

• Available in various kits, including the 82439HX ISA Kit (TXC, PIIX3) and the 82439HX ISA/DP Kit (TXC, PIIX3, IOAPIC), to cater to different system requirements.

The Intel 430HX PCIset is a comprehensive chipset designed to enhance the performance and functionality of systems using Intel's Pentium processors, offering features like integrated cache control, ECC support, PCI compatibility, and USB connectivity.