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參數(shù)資料
| 型號： | LH540215 |
| 廠商： | Sharp Corporation |
| 英文描述： | 512 x 18 / 1024 x 18 Synchronous FIFO |
| 中文描述： | 512 ×一千〇二十四分之一十八× 18同步FIFO |
| 文件頁數(shù)： | 38/48頁 |
| 文件大?。?/td> | 423K |
| 代理商： | LH540215 |
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APPLICATIONS INFORMATION
Standalone Configuration
When depth cascading is not required for a given
application, the LH540215/25 is placed in standalone
mode by tying the two Expansion In pins WXI/
WEN
2
and
RXI/
REN
2
to ground, while also holding the First
Load/Retransmit pin FL/
RT
LOW for the duration of any
reset operation. (See Table 1.) Subsequently, FL/
RT
may
be taken HIGH at will, whenever a retransmit operation is
desired. If not being used, FL/RT also may be tied to
ground, as shown in Figure 26.
Width Expansion
Word-width expansion is implemented by placing mul-
tiple LH540215/25 devices in parallel. Each device should
be configured for standalone mode, unless the depth of
one single FIFO is not adequate for the application. In this
event, word-width expansion may in principle be used
with either of the two depth-cascading schemes sup-
ported by the LH540215/25 architecture. In practice, the
reliability benefits of interlocked-paralleled operation are
available only with the pipelining scheme, making it the
preferred alternative. (Refer to discussion in a later sec-
tion.)
RXI
RCLK
540215-19
t
XI
t
XIS
Figure 25. Read-Expansion-In Timing,
IDT-Compatible Operating Mode
WRITE ENABLE (WEN)
WRITE CLOCK (WCLK)
LOAD (LD)
DATA IN
FULL FLAG (FF)
PROGRAMMABLE
ALMOST-EMPTY FLAG (PAE)
HALF-FULL FLAG (WXO/HF)
READ CLOCK (RCLK)
READ ENABLE (REN)
OUTPUT ENABLE (OE)
DATA OUT
EMPTY FLAG (EF)
PROGRAMMABLE
ALMOST-FULL FLAG (PAF)
WRITE EXPANSION IN (WXI/
WEN
2
)
FIRST LOAD (FL/
RT
)
(MUST BE LOW
DURING A RESET
OPERATION)
540215-21
LH540215/25
D[17:0]
RESET (RS)
ENHANCED
MODE (EMODE)
BOLD ITALIC = Enhanced Operating Mode.
READ EXPANSION IN (RXI/
REN
2
)
Q[17:0]
18
18
Figure 26. Standalone FIFO
(512
×
18 / 1024
×
18)
TIMING DIAGRAMS (cont’d)
BOLD ITALIC = Enhanced Operating Mode
LH540215/25
512 x 18/1024 x 18 Synchronous FIFO
38
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LH540235 | 2048 x 18 / 4096 x 18 Synchronous FIFOs |
| LH5420 | 256 x 36 x 2 Bidirectional FIFO |
| LH5424-S | 5 mm T1 3/4 LED, Non Diffused Super-Bright, Hyper-Red GaAIAs-LED |
| LH5424-QT | 5 mm T1 3/4 LED, Non Diffused Super-Bright, Hyper-Red GaAIAs-LED |
| LH5424-T | 5 mm T1 3/4 LED, Non Diffused Super-Bright, Hyper-Red GaAIAs-LED |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LH540215U-15 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x18 Synchronous FIFO |
| LH540215U-20 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x18 Synchronous FIFO |
| LH540215U-25 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x18 Synchronous FIFO |
| LH540215U-35 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x18 Synchronous FIFO |
| LH540215U-50 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:x18 Synchronous FIFO |
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