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GS9090B Datasheet(PDF) 50 Page - Gennum Corporation

Part # GS9090B
Description  GenLINX짰 III 270Mb/s Deserializer for SDI
Download  71 Pages
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Manufacturer  GENNUM [Gennum Corporation]
Direct Link  http://www.gennum.com
Logo GENNUM - Gennum Corporation

GS9090B Datasheet(HTML) 50 Page - Gennum Corporation

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GS9090B Data Sheet
40749 - 2
January 2007
50 of 71
the write pointer reaches the programmed offset. Once the pointer offset has been
exceeded, the FIFO_EMPTY flag will go LOW (see block B in Figure 3-12).
In the case where the read pointer is originally ahead of the write pointer, the
FIFO_FULL flag will be set HIGH when both pointers arrive at the same address
(see block C in Figure 3-12). This flag can be used to determine when to begin
reading from the device.
A read and write pointer offset may also be programmed in the
FIFO_FULL_OFFSET[9:0] register of the host interface. If an offset value is
programmed in this register, the FIFO_FULL flag will be set HIGH when the read
and write pointers of the FIFO are at the same address, and will remain set HIGH
until the read pointer reaches the programmed offset. Once the pointer offset has
been exceeded, the FIFO_FULL flag will be cleared (see block D in Figure 3-12).
Gating the RD_CLK Using the FIFO_EMPTY Flag
Using the asynchronous FIFO_EMPTY flag to gate RD_CLK requires external
clock gating circuity. The recommended circuit for this application is shown in
Figure 3-11.
Figure 3-11: Recommended Circuit to Gate RD_CLK Using the FIFO_EMPTY
Flag
FIFO_EMPTY
Q
Q
SET
CLR
D
Q
Q
SET
CLR
D
Q
Q
SET
CLR
D
RD_CLK
GATED
RD_CLK
FIFO_EMPTY
GATED
RD_CLK
RD_CLK


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