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5962-8956809QNC Datasheet(PDF) 7 Page - ATMEL Corporation |
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5962-8956809QNC Datasheet(HTML) 7 Page - ATMEL Corporation |
7 / 20 page 7 M67204H 4141J–AERO–04/07 Note: 1. Pointer will increment if flag is high. Note: 1. XI is connected to XO of previous device. See Figure 4. Depth Expansion (Daisy Chain) Mode The M67204H can be easily adapted for applications which require more than 4096 words. Figure 4 demonstrates Depth Expansion using three M67204H. Any depth can be achieved by adding additional M67204H. The M67204H operates in the Depth Expansion configuration if the following conditions are met: 1. The first device must be designated by connecting the First Load (FL) control input to ground. 2. All other devices must have FL in the high state. 3. The Expansion Out (XO) pin of each device must be connected to the Expansion In (XI) pin of the next device. See Figure 4. 4. External logic is needed to generate a composite Full Flag (FF) and Empty Flag (EF). This requires that all EF’s and all FFs be ORed (i.e. all must be set to generate the correct composite FF or EF). See Figure 4. 5. The Retransmit (RT) function and Half-Full Flag (HF) are not available in the Depth Expansion Mode. Compound Expansion Module It is quite simple to apply the two expansion techniques described above together to cre- ate large FIFO arrays (see Figure 5). Table 1. Reset and Retransmit Single Device Configuration/Width Expansion Mode Mode Inputs Internal Status Outputs RS RT XI Read Pointer Write Pointer EF FF HF Reset 0 X 0 Location Zero Location Zero 0 1 1 Retransmit 1 0 0 Location Zero Unchanged X X X Read/Write 1 1 0 Increment Increment(1) X X X Table 2. Reset and First Load Truth Table Depth Expansion/Compound Expansion Mode Mode Inputs Internal Status Outputs RS RT XI Read Pointer Write Pointer EF FF Reset First Device 0 0 (1) Location Zero Location Zero 0 1 Reset All Other Devices 0 1 (1) Location Zero Location Zero 0 1 Read/Write 1 X (1) X X X X |
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