CH365P

The CH365 interface chip supports the upgrade of ISA cards to the PCI bus through a method called local hardware addressing. This method allows the product manufacturer to select the I/O address for the PCI device, enabling the translation of part of the PCI device's I/O address through peripheral secondary decoding circuits. These circuits are simple and similar to ISA bus I/O address decoding. When the peripheral circuit matches the address decoding, it requests local hardware addressing from the CH365, which then requests the PCI bus to perform I/O operations at that address. This feature allows for easy upgrading of ISA cards to the PCI bus without the need to modify any application software . Additionally, the CH365 chip provides the capability to set the device ID for PCI devices. By default, PCI cards use the CH365 chip's default device ID. However, if a product manufacturer wishes to set a custom or specific device ID, they can do so by setting the CH365 to external ID mode after system reset and providing a new device ID through external circuitry. This allows for customization of the device ID for PCI cards using the CH365 chip . In conclusion, the CH365 interface chip facilitates the upgrade of ISA cards to the PCI bus by offering local hardware addressing for selecting I/O addresses and the ability to set custom device IDs for PCI devices, providing a seamless transition without the need for software modifications .

The CH365 interface chip provides various functionalities such as asynchronous data exchange with handshake signals, standard byte-based data exchange between CH365 and microcontrollers using the 8255 I/O expansion chip, and simulation of SPI interface through software. It also supports features like input/output buffer status signals, interrupt signals, and control of data exchange between a PC and a microcontroller . Additionally, the CH365 chip offers capabilities such as supporting ROM expansion without hard disk booting, flash memory online upgrades, providing a subprogram library for BIOS environment user interface display and data processing, supporting local interrupt requests, and a two-wire serial host interface for connecting EEPROM devices like 24C0X. It also includes a hardware timing unit for software delay references, compatibility with PQFP-80 packaging, driver support for Windows operating systems, and operation without the need for additional drivers . In terms of packaging, the CH365 chip is available in a PQFP-80 package with specific dimensions and pin configurations . Overall, the CH365 interface chip serves as a versatile solution for data exchange, expansion, and interfacing requirements in various applications, providing ease of use, low cost, and multiple patented technologies .