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SN74V245 データシート(PDF) 4 Page - Texas Instruments |
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SN74V245 データシート(HTML) 4 Page - Texas Instruments |
4 / 42 page SN74V245-EP SCAS932A – DECEMBER 2012 – REVISED JANUARY 2013 www.ti.com TERMINAL FUNCTIONS (continued) TERMINAL I/O DESCRIPTION NAME NO. 28, 29, 31, 32, 34, 36–39, 41, 42, 44, Q0–Q17 O Data outputs. Data outputs for an 18-bit bus. 45, 47, 48, 50, 52, 53 Read clock. When REN is low, data is read from the FIFO on a low-to-high transition of RCLK 61 I RCLK, if the FIFO is not empty. Read enable. When REN is low, data is read from the FIFO on every low-to-high transition of REN 60 I RCLK. When REN is high, the output register holds the previous data. Data is not read from the FIFO if EF is low. Reset. When RS is set low, internal read and write pointers are set to the first location of the RS 57 I RAM array, FF and PAF go high, and PAE and EF go low. A reset is required before an initial write after power up. Read expansion. In the single-device or width-expansion configuration, RXI, together with FL and WXI, determines if the mode is standard mode or FWFT mode, as well as whether the RXI 24 I PAE/PAF flags are synchronous or asynchronous (see Table 5). In the daisy-chain depth- expansion configuration, RXI is connected to RXO (read expansion out) of the previous device. Last-location-read flag. In the depth-expansion configuration, a pulse is sent from RXO to RXO 27 O RXI of the next device when the last location in the FIFO is read. VCC 22, 33, 43, 49, 56 Supply voltage. +3.3-V power-supply pins. Write clock. When WEN is low, data is written into the FIFO on a low-to-high transition of WCLK 19 I WCLK if the FIFO is not full. Write enable. When WEN is low, data is written into the FIFO on every low-to-high transition WEN 20 I of WCLK. When WEN is high, the FIFO holds the previous data. Data is not written into the FIFO if FF is low. Width expansion. In the single-device or width-expansion configuration, WXI, together with FL and RXI, determines if the mode is standard mode or FWFT mode, as well as whether WXI 21 I the PAE/PAF flags are synchronous or asynchronous (see Table 5). In the daisy-chain depth-expansion configuration, WXI is connected to WXO (write expansion out) of the previous device. Half-full flag. In the single-device or width-expansion configuration, the device is more than WXO/HF 26 O half full when HF is low. In the depth-expansion configuration, a pulse is sent from WXO to WXI of the next device when the last location in the FIFO is written. 4 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated Product Folder Links: SN74V245-EP |
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