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SN74ABT3613-15PCB датащи(PDF) 11 Page - Texas Instruments |
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SN74ABT3613-15PCB датащи(HTML) 11 Page - Texas Instruments |
11 / 35 page SN74ABT3613 64 × 36 CLOCKED FIRST-IN, FIRST-OUT MEMORY WITH BUS MATCHING AND BYTE SWAPPING SCBS128F – JULY 1992 – REVISED APRIL 1998 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1st: Read From FIFO 2nd: Read From FIFO 3rd: Read From FIFO 4th: Read From FIFO (d) BYTE SIZE – BIG ENDIAN A B C D B35 B27 B26 B18 B17 B9 B8 B0 B35 B27 B26 B18 B17 B9 B8 B0 B35 B27 B26 B18 B17 B9 B8 B0 B35 B27 B26 B18 B17 B9 B8 B0 LH L BE SIZ1 SIZ0 2nd: Read From FIFO 3rd: Read From FIFO 4th: Read From FIFO (e) BYTE SIZE – LITTLE ENDIAN 1st: Read From FIFO B35 B27 B26 B18 B17 B9 B8 B0 B35 B27 B26 B18 B17 B9 B8 B0 B35 B27 B26 B18 B17 B9 B8 B0 B35 B27 B26 B18 B17 B9 B8 B0 D C B A HH L BE SIZ1 SIZ0 Figure 1. Dynamic Bus Sizing (Continued) bus-matching FIFO reads Data is read from the FIFO RAM in 36-bit long-word increments. If a long-word bus size is implemented, the entire long word immediately shifts to the FIFO output register upon a read. If byte or word size is implemented on port B, only the first one or two bytes appear on the selected portion of the FIFO output register with the rest of the long word stored in auxiliary registers. In this case, subsequent FIFO reads with the same bus-size implementation output the rest of the long word to the FIFO output register in the order shown by Figure 1. Each FIFO read with a new bus-size implementation automatically unloads data from the FIFO RAM to its output register and auxiliary registers. Implementing a new port-B bus size and performing a FIFO read before all bytes or words stored in the auxiliary registers have been read results in a loss of the unread data in these registers. When reading data from FIFO in byte or word format, the unused B0–B35 outputs remain inactive but static, with the unused FIFO output register bits holding the last data value to decrease power consumption. |
Аналогичный номер детали - SN74ABT3613-15PCB |
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Аналогичное описание - SN74ABT3613-15PCB |
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