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LH540215 Datasheet(PDF) 38 Page - Sharp Corporation

Part # LH540215
Description  512 x 18 / 1024 x 18 Synchronous FIFO
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Manufacturer  SHARP [Sharp Corporation]
Direct Link  http://sharp-world.com/
Logo SHARP - Sharp Corporation

LH540215 Datasheet(HTML) 38 Page - Sharp Corporation

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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/
WEN2 and
RXI/
REN2 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
tXI
tXIS
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/
WEN2)
FIRST LOAD (FL/
RT)
(MUST BE LOW
DURING A RESET
OPERATION)
540215-21
LH540215/25
RESET (RS)
ENHANCED
MODE (EMODE)
BOLD ITALIC = Enhanced Operating Mode.
READ EXPANSION IN (RXI/
REN2)
D[17:0]
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


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