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參數(shù)資料
| 型號(hào)： | LH540235 |
| 廠商： | Sharp Corporation |
| 英文描述： | 2048 x 18 / 4096 x 18 Synchronous FIFOs |
| 中文描述： | 2048 ×四千零九十六分之十八× 18同步FIFO的 |
| 文件頁(yè)數(shù)： | 36/46頁(yè) |
| 文件大?。?/td> | 369K |
| 代理商： | LH540235 |
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APPLICATIONS INFORMATION
Standalone Configuration
When depth cascading is not required for a given
application, the LH540235/45 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 27.
Width Expansion
Word-width expansion is implemented by placing mul-
tiple LH540235/45 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 LH540235/45 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
540235-19
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)
540235-21
LH540235/45
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
(2048
×
18 / 4096
×
18)
TIMING DIAGRAMS (cont’d)
BOLD ITALIC = Enhanced Operating Mode
LH540235/45
2048 x 18/4096 x 18 Synchronous FIFOs
36
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| LH5424-SU | 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 |
|---|---|
| LH540235M-20 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:x18 Synchronous FIFO |
| LH540235M-25 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:x18 Synchronous FIFO |
| LH540235M-35 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:x18 Synchronous FIFO |
| LH540235U-20 | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:x18 Synchronous FIFO |
| LH540235U-25 | 制造商:SHARP 制造商全稱(chēng):Sharp Electrionic Components 功能描述:2048 x 18 / 4096 x 18 Synchronous FIFOs |
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