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SN74ACT3651 Datasheet(PDF) 11 Page - Texas Instruments |
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SN74ACT3651 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 26 page SN74ACT3651 2048 × 36 CLOCKED FIRST-IN, FIRST-OUT MEMORY SCAS439D – JUNE 1994 – REVISED FEBRUARY 1999 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 mailbox registers Two 36-bit bypass registers pass command and control information between port A and port B. The mailbox-select (MBA, MBB) inputs choose between a mail register and a FIFO for a port data-transfer operation. A low-to-high transition on CLKA writes A0 – A35 data to the mail1 register when a port-A write is selected by CSA, W/RA, and ENA with MBA high. A low-to-high transition on CLKB writes B0 – B35 data to the mail2 register when a port-B write is selected by CSB, W/RB, and ENB with MBB high. Writing data to a mail register sets its corresponding flag (MBF1 or MBF2) low. Attempted writes to a mail register are ignored while its mail flag is low. When the port-B data (B0 – B35) outputs are active, the data on the bus comes from the FIFO output register when the MBB input is low and from the mail1 register when MBB is high. Mail2 data is always present on the port-A data (A0 – A35) outputs when they are active. The mail1 register flag (MBF1) is set high by a low-to-high transition on CLKB when a port-B read is selected by CSB, W/RB, and ENB with MBB high. The mail2 register flag (MBF2) is set high by a low-to-high transition on CLKA when a port-A read is selected by CSA, W/RA, and ENA with MBA high. The data in a mail register remains intact after it is read and changes only when new data is written to the register. tpd(R-F) CLKA CLKB RST 0,1 th(FS) tsu(FS) th(RS) tsu(RS) FS1, FS0 IR tpd(C-IR) tpd(C-IR) OR tpd(C-OR) tpd(R-F) AE AF MBF1, MBF2 tpd(R-F) Figure 1. FIFO Reset Loading X and Y With a Preset Value of Eight |
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