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L8C202 Datasheet(PDF) 3 Page - LOGIC Devices Incorporated |
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L8C202 Datasheet(HTML) 3 Page - LOGIC Devices Incorporated |
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3 / 22 page  DEVICES INCORPORATED 3 L8C201/202/203/204 512/1K/2K/4K x 9-bit Asynchronous FIFO 03/04/99–LDS.8C201/2/3/4-H FIFO Products 4. External logic is needed to generate a composite Full Flag (FF) and Empty Flag (EF). This requires the ORing of all EFs and ORing of all FFs (i.e., all must be set to generate the correct composite FF or EF). 5. The Retransmit (RT) function and Half-Full Flag (HF) are not avail- able in the Depth Expansion Mode. Bidirectional Mode Applications which require data buffering between two systems (each system capable of read and write operations) can be achieved by pairing FIFOs. Care must be taken to assure that the appropriate flag is monitored by each system (i.e., FF is monitored on the device when W is used; EF is monitored on the device when R is used). Both Depth Expansion and Width Expansion may be used in this mode. OPERATING MODES Single Device Mode A single FIFO may be used when the application requirements are for the number of words in a single device. The FIFOs are in a Single Device Configuration when the Expansion In (XI) control input is grounded. In this mode the Half-Full Flag (HF), which is an active-low output, is the active function of the combination pin XO/ HF. Width Expansion Mode Word width may be increased simply by connecting the corresponding input control signals of multiple devices. Status flags (EF, FF, and HF) can be detected from any one device. Any word width can be attained by adding additional FIFOs. Flag detection is accomplished by monitoring the FF, EF, and HF signals on either (any) device used in the width expansion configuration. Do not connect any output signals together. Depth Expansion (Daisy Chain) Mode The FIFOs can easily be adapted to applications where the requirements are for greater than the number of words in a single device. Any depth can be attained by adding additional FIFOs. The FIFOs operates in the Depth Expansion configuration when the following conditions are met: 1. The first device must be designated by grounding the First Load (FL) control input. 2. All other devices must have FL in the HIGH state. 3. The Expansion Out (XO) pin of each device must be tied to the Expansion In (XI) pin of the next device with the last device connect- ing back to the first. |
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