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FT245BL Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers |
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8 / 24 page DS245BL Version 1.6 © Future Technology Devices Intl. Ltd. 2005 Page 8 of 24 FT245BL USB FIFO ( USB - Parallel ) I.C. 4.1 Signal Descriptions Table 1 - FT245BL - PINOUT DESCRIPTION FIFO DATA BUS GROUP (*** Note 1) Pin# Signal Type Description 25 DO I/O FIFO Data Bus Bit 0 24 D1 I/O FIFO Data Bus Bit 1 23 D2 I/O FIFO Data Bus Bit 2 22 D3 I/O FIFO Data Bus Bit 3 21 D4 I/O FIFO Data Bus Bit 4 20 D5 I/O FIFO Data Bus Bit 5 19 D6 I/O FIFO Data Bus Bit 6 18 D7 I/O FIFO Data Bus Bit 7 FIFO CONTROL INTERFACE GROUP Pin# Signal Type Description 16 RD# IN Enables Current FIFO Data Byte on D0..D7 when low. Fetches the next FIFO Data Byte (if available) from the Receive FIFO Buffer when RD# goes from low to high. *** Note 1 15 WR IN Writes the Data Byte on the D0..D7 into the Transmit FIFO Buffer when WR goes from high to low. *** Note 1 14 TXE# OUT When high, do not write data into the FIFO. When low, data can be written into the FIFO by strobing WR high then low. *** Note 2 12 RXF# OUT When high, do not read data from the FIFO. When low, there is data available in the FIFO which can be read by strobing RD# low then high again *** Note 2 USB INTERFACE GROUP Pin# Signal Type Description 7 USBDP I/O USB Data Signal Plus (Requires 1.5K pull-up to 3V3OUT or RSTOUT#) 8 USBDM I/O USB Data Signal Minus EEPROM INTERFACE GROUP Pin# Signal Type Description 32 EECS I/O EEPROM – Chip Select. For 48MHz operation pull EECS to GND using a 10K resistor. For 6MHz operation no resistor is required. *** Note 3 1 EESK OUT Clock signal to EEPROM. Adding a 10K pull down resistor onto EESK will cause the FT245BL to use USB Product ID 6005 (hex) instead of 6001 (hex). All of the other USB device descriptors are unchanged. *** Note 3 2 EEDATA I/O EEPROM – Data I/O Connect directly to Data-In of the EEPROM and to Data- Out of the EEPROM via a 2.2K resistor. Also pull Data-Out of the EEPROM to VCC via a 10K resistor for correct operation. *** Note 3 |
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