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SN74V225-10PAG 데이터시트(PDF) 10 Page - Texas Instruments

부품명 SN74V225-10PAG
상세설명  512 X 18, 1024 X 18, 2048 X 18, 4096 X 18 DSP-SYNC FIRST-IN, FIRST-OUT MEMORIES
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SN74V225-10PAG 데이터시트(HTML) 10 Page - Texas Instruments

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SN74V215, SN74V225, SN74V235, SN74V245
512
× 18, 1024 × 18, 2048 × 18, 4096 × 18
DSP-SYNC
 FIRST-IN, FIRST-OUT MEMORIES
SCAS636E – APRIL 2000 – REVISED SEPTEMBER 2002
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
functional description (continued)
Table 3. Status Flags for FWFT Mode
NUMBER OF WORDS IN FIFO
IR
PAF
HF
PAE
OR
SN74V215
SN74V225
SN74V235
SN74V245
IR
PAF
HF
PAE
OR
0
0
0
0
L
H
H
L
H
1 to (n+1)†
1 to (n+1)†
1 to (n+1)†
1 to (n+1)†
L
H
H
L
L
(n+2) to 257
(n+2) to 513
(n+2) to 1025
(n+2) to 2049
L
H
H
H
L
258 to [513–(m+1)]‡
514 to [1025–(m+1)]‡
1026 to [2049–(m+1)]‡
2050 to [4097–(m+1)]‡
L
H
L
H
L
(513–m) to 512
(1025–m) to 1024
(2049–m) to 2048
(4097–m) to 4096
L
L
L
H
L
513
1025
2049
4097
H
L
L
H
L
† n = Empty offset (SN74V215 n = 63; SN74V225, SN74V235, and SN74V245 n = 127)
‡ m = Full offset (SN74V215 m = 63; SN74V225, SN74V235, and SN74V245 m = 127)
STANDARD MODE
In this mode, status flags FF, PAF, HF, PAE, and EF operate in the manner outlined in Table 4. To write data into
the FIFO, write enable (WEN) must be low. Data presented to the data-in lines is clocked into the FIFO on
subsequent transitions of the write clock (WCLK). After the first write is performed, the empty flag (EF) goes
high. Subsequent writes continue to fill the FIFO. The programmable almost-empty flag (PAE) goes high after
n + 1 words have been loaded into the FIFO, where n is the empty offset value. The default setting for this value
is stated in the footnote of Table 4. This parameter also is user programmable. See the Programmable Flag
Offset Loading section.
If data continues to be written into the FIFO, and no read operations are taking place, the half-full flag (HF)
switches to low when the 257th (SN74V215), 513th (SN74V225), 1025th (SN74V235), and 2049th (SN74V245)
word, is written into the FIFO. Continuing to write data into the FIFO causes the programmable almost-full flag
(PAF) to go low. Again, if no reads are performed, PAF goes low after (512 – m) writes for the SN74V215, (1024
– m) writes for the SN74V225, (2048 – m) writes for the SN74V235 and (4096 – m) writes for the SN74V245.
Offset m is the full offset value. This parameter also is user programmable. See the Programmable Flag Offset
Loading section. If there is no full offset specified, PAF is low when the device is 63 away from full for SN74V215,
and 127 away from full for the SN74V225, SN74V235, and SN74V245.
When the FIFO is full, the full flag (FF) goes low, inhibiting further write operations. If no reads are performed
after a reset, FF goes low after D writes to the FIFO. D = 512 for the SN74V215, 1024 for the SN74V225, 2048
for the SN74V235, and 4096 for the SN74V245.
If the FIFO is full, the first read operation causes FF to go high. Subsequent read operations cause PAF and
the half-full flag (HF) to go high under the conditions described in Table 4. If further read operations occur,
without write operations, the programmable almost-empty flag (PAE) goes low when there are n words in the
FIFO, where n is the empty offset value. If there is no empty offset specified, PAE is low when the device is 63
away from completely empty for SN74V215, and 127 away from completely empty for SN74V225, SN74V235,
and SN74V245. Continuing read operations cause the FIFO to be empty. When the last word has been read
from the FIFO, EF goes low, inhibiting further read operations. REN is ignored when the FIFO is empty.


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