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ST7265AR4T1 Datasheet(PDF) 4 Page - STMicroelectronics |
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ST7265AR4T1 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 166 page ST7265x 4/166 1 INTRODUCTION The ST7265x MCU supports volume data ex- change with a host (computer or kiosk) via a full speed USB interface. The MCU is capable of han- dling various transfer protocols, with a particular emphasis on mass storage applications. ST7265x is compliant with the USB Mass Storage Class specifications, and supports related proto- cols such as BOT (Bulk Only Transfer) and CBI (Control, Bulk, Interrupt). It is based on the ST7 standard 8-bit core, with specific peripherals for managing USB full speed data transfer between the host and most types of FLASH media card: – A full speed USB interface with Serial Interface Engine, and on-chip 3.3V regulator and trans- ceivers. – A dedicated 24 MHz Data Buffer Manager state machine for handling 512-byte data blocks (this size corresponds to a sector both on computers and FLASH media cards). – A Data Transfer Coprocessor (DTC), able to handle fast data transfer with external devices. This DTC also computes the CRC or ECC re- quired to handle Mass storage media. – An Arbitration block gives the ST7 core priority over the USB and DTC when accessing the Data Buffer. In USB mode, the USB interface is serv- iced before the DTC. – A FLASH Supply Block able to provide program- mable supply voltage and I/O electrical levels to the FLASH media. Figure 1. USB Data Transfer Block Diagram 512-byte RAM Buffer 512-byte RAM Buffer DATA COPROCESSOR DATA TRANSFER BUFFER LEVEL SHIFTERS MASS DEVICE USB SIE ST7 CORE STORAGE TRANSFER (DTC) ARBITRATION USB DATA TRANSFER BUFFER ACCESS 1 |
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