參數(shù)資料
型號(hào): GS9090
廠商: Gennum Corporation
英文描述: GS9090 GenLINX-R III 270Mb/s Deserializer for SDI and DVB-ASI
中文描述: GS9090 GenLINX - R的第三270Mb / s的SDI和DVB解串器,意大利航天局
文件頁(yè)數(shù): 49/70頁(yè)
文件大小: 696K
代理商: GS9090
GS9090 Data Sheet
28201 - 1
July 2005
49 of 70
A write and read pointer offset may be programmed in the
FIFO_EMPTY_OFFSET[9:0] register of the host interface. If an offset value is
programmed in this register, the FIFO_EMPTY flag will be set HIGH when the read
and write pointers of the FIFO are at the same address, and will remain HIGH until
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 3-11
).
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 3-11
). The application layer can use this flag 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 3-11
).
Gating the RD_CLK Using the FIFO_EMPTY Flag
Using the asynchronous FIFO_EMPTY flag to gate RD_CLK requires external
clock gating circuity to generate a clean burst clock (see
Figure 3-9
). An example
circuit for this application is shown in
Figure 3-10
.
Figure 3-9: Burst Clock
Figure 3-10: Example 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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