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SN74ACT3638-20PQ データシート(PDF) 7 Page - Texas Instruments

部品番号 SN74ACT3638-20PQ
部品情報  512 횞 32 횞 2 CLOCKED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
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SN74ACT3638-20PQ データシート(HTML) 7 Page - Texas Instruments

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SN74ACT3638
512
× 32 × 2
CLOCKED BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
SCAS228D – JUNE 1992 – REVISED APRIL 1998
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
almost-empty flag and almost-full flag offset programming (continued)
Table 1. Flag Programming
FS1
FS0
RST1
RST2
X1 AND Y1 REGISTERS†
X2 AND Y2 REGISTERS‡
H
H
X
64
X
H
H
X
X
64
H
L
X
16
X
H
L
X
X
16
L
H
X
8
X
L
H
X
X
8
L
L
Programmed from port A
Programmed from port A
† X1 register holds the offset for AEB; Y1 register holds the offset for AFA.
‡ X2 register holds the offset for AEA; Y2 register holds the offset for AFB.
To load the almost-empty flag and almost-full flag offset registers of a FIFO with one of the three preset values
listed in Table 1, at least one of the flag-select inputs must be high during the low-to-high transition of its reset
input. For example, to load the preset value of 64 into X1 and Y1, FS0 and FS1 must be high when FIFO1 reset
(RST1) returns high. Flag-offset registers associated with FIFO2 are loaded with one of the preset values in the
same way with FIFO2 reset (RST2). When using one of the preset values for the flag offsets, the FIFOs can
be reset simultaneously or at different times.
To program the X1, X2, Y1, and Y2 registers from port A, both FIFOs should be reset simultaneously with FS0
and FS1 low during the low-to-high transition of the reset inputs. After this reset is complete, the first four writes
to FIFO1 do not store data in RAM but load the offset registers in the order Y1, X1, Y2, X2. Each offset register
uses port-A (A8 – A0) inputs, with A8 as the most-significant bit. Each register value can be programmed from
1 to 508. After all the offset registers are programmed from port A, the port-B input-ready flag (IRB) is set high,
and both FIFOs begin normal operation.
FIFO write/read operation
The state of the port-A data (A0 – A31) outputs is controlled by the port-A chip select (CSA) and the port-A
write/read select (W/RA). The A0 – A31 outputs are in the high-impedance state when either CSA or W/RA is
high. The A0 – A31 outputs are active when both CSA and W/RA are low.
Data is loaded into FIFO1 from the A0 – A31 inputs on a low-to-high transition of CLKA when CSA is low, W/RA
is high, ENA is high, MBA is low, and IRA is high. Data is read from FIFO2 to the A0 – A31 outputs by a low-to-high
transition of CLKA when CSA is low, W/RA is low, ENA is high, MBA is low, and ORA is high (see Table 2). FIFO
reads and writes on port A are independent of any concurrent port-B operation.
Table 2. Port-A Enable Function Table
CSA
W/RA
ENA
MBA
CLKA
A0 – A31 OUTPUTS
PORT FUNCTION
H
X
X
X
X
In high-impedance state
None
L
H
L
X
X
In high-impedance state
None
L
H
H
L
In high-impedance state
FIFO1 write
L
H
H
H
In high-impedance state
Mail1 write
L
L
L
L
X
Active, FIFO2 output register
None
L
L
H
L
Active, FIFO2 output register
FIFO2 read
L
L
L
H
X
Active, mail2 register
None
L
L
H
H
Active, mail2 register
Mail2 read (set MBF2 high)


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