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Programmable system device : ウィキペディア英語版 | Programmable system device
A Programmable system device (PSD) is a type of integrated circuit manufactured by STMicroelectronics. Meant to be teamed up with a microprocessor or microcontroller, the PSD provides most of the other functions required to implement small applications such as embedded systems. The PSD provides the following functions: * RAM * Flash ROM * A reprogrammable gate array for address decode, input/output functions, and random logic The entire PSD is reprogrammable using JTAG; this includes the random logic that's configuration is loaded from flash-like memory. If the user provides the correct connections, the device can also be reprogrammed in the field (still using JTAG) in a process known as In-System Programming. The portions of the chip that act as ordinary flash ROM may also be reprogrammed by the application's microcontroller in a process known as In-Application Programming. PSDs are made in various configurations with varying amounts of ROM, RAM, random logic, and I/O ports.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Programmable system device」の詳細全文を読む
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