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SN74ABT3613 Datasheet(PDF) 10 Page - Texas Instruments |
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SN74ABT3613 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 32 page SN74ABT3613 64 × 36 CLOCKED FIRST-IN, FIRST-OUT MEMORY WITH BUS MATCHING AND BYTE SWAPPING SCBS128F – JULY 1992 – REVISED APRIL 1998 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 dynamic bus sizing The port-B bus can be configured in a 36-bit long word, 18-bit word, or 9-bit byte format for data read from the FIFO. Word- and byte-size bus selections can utilize the most-significant bytes of the bus (big endian) or least-significant bytes of the bus (little endian). Port-B bus size can be changed dynamically and synchronous to CLKB to communicate with peripherals of various bus widths. The levels applied to the port-B bus-size select (SIZ0, SIZ1) inputs and the big-endian select (BE) input are stored on each CLKB low-to-high transition. The stored port-B bus-size selection is implemented by the next rising edge on CLKB according to Figure 1. Only 36-bit long-word data is written to or read from the FIFO memory on the SN74ABT3613. Bus-matching operations are done after data is read from the FIFO RAM. Port-B bus sizing does not apply to mail-register operations. Read From FIFO Write to FIFO (a) LONG-WORD SIZE 1st: Read From FIFO 2nd: Read From FIFO (b) WORD SIZE – BIG ENDIAN BYTE ORDER ON PORT A: A35 A27 A26 A18 A17 A9 A8 A0 B35 B27 B26 B18 B17 B9 B8 B0 XL L BE SIZ1 SIZ0 AB CD AB CD AB CD B35 B27 B26 B18 B17 B9 B8 B0 B35 B27 B26 B18 B17 B9 B8 B0 LL H BE SIZ1 SIZ0 1st: Read From FIFO 2nd: Read From FIFO (c) WORD SIZE – LITTLE ENDIAN CD AB B35 B27 B26 B18 B17 B9 B8 B0 B35 B27 B26 B18 B17 B9 B8 B0 HL H BE SIZ1 SIZ0 Figure 1. Dynamic Bus Sizing |
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