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SN74ACT3641PCB bảng dữ liệu(PDF) 11 Page - Texas Instruments

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SN74ACT3641
1024
× 36
CLOCKED FIRST-IN, FIRST-OUT MEMORY
SCAS338C – JANUARY 1994 – REVISED OCTOBER 1997
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
mailbox registers
Two 36-bit bypass registers are on the SN74ACT3641 to 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 port-B mailbox select (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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