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FT121T-U Datasheet(PDF) 10 Page - Future Technology Devices International Ltd. |
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FT121T-U Datasheet(HTML) 10 Page - Future Technology Devices International Ltd. |
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10 / 46 page  Copyright © 2014 Future Technology Devices International Limited 10 Document No.: FT_000648 FT121 ENHANCED USB DEVICE CONTROLLER WITH SPI SLAVE IC Datasheet Version 1.2 Clearance No.: FTDI# 312 OUT Buffer. Data sent from the USB host controller to FT121 via the USB data OUT endpoint is stored in the OUT buffer. Data is removed from the OUT buffer to system memory under control of the parallel interface block. IN Buffer. Data from system memory is stored in the IN buffer. The USB host controller removes data from the IN buffer by sending a USB request for data from the device data IN endpoint. RESET Generator. The integrated Reset Generator cell provides a reliable power-on reset to the device internal circuitry at power up. The RESET_n input pin allows an external device to reset the FT121. SPI Controller Block. The SPI slave controller provides control and data interfaces between the external MCU and internal registers and endpoint buffers. It supports 4-wire (default) or 3-wire SPI operation. 4.2 Interrupt Modes The FT121 interrupt pin (INT_n) can be programmed to generate an interrupt in different modes. The interrupt source can be any bit in the Interrupt Register, an SOF packet being received, or both. The interrupt modes are selectable by two register bits, one is the SOF-only Interrupt Mode bit (bit 7 of Clock Division Factor register), and the other is the Interrupt Pin Mode bit (bit 5 of Interrupt Configuration register). Interrupt mode Bit SOF-only Interrupt Mode Bit Interrupt Pin Mode Interrupt source 0 0 0 Any bit in Interrupt register 1 0 1 Any bit in Interrupt register and SOF 2 1 X SOF only Table 4.1 Interrupt modes 4.3 SPI Slave Interface The SPI slave interface supports 4-wire (default) and 3-wire operation. In 4-wire operation the SPI master will drive data on the MOSI pin and the SPI slave will drive data on the MISO pin. In 3-wire operation both SPI master and SPI slave share the same data pin (MOSI pin becomes a bi-directional pin). Upon power-on or hardware reset, the FT121 SPI slave interface is in 4-wire mode. The 3-wire operation is enabled when a Set 3-wire command is issued to the FT121. The SPI protocol will follow a command + data format where a command is transmitted after SS_n is asserted and each subsequent byte will be a data byte. When all data bytes for this command are completed the SS_n is de-asserted. This can be seen in Figure 4-1. |
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