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SN74ACT3651 Arkusz danych(PDF) 11 Page - Texas Instruments

Numer części SN74ACT3651
Szczegółowy opis  2048 횞 36 CLOCKED FIRST-IN, FIRST-OUT MEMORY
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
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SN74ACT3651 Arkusz danych(HTML) 11 Page - Texas Instruments

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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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