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DSP56857 bảng dữ liệu(PDF) 306 Page - Freescale Semiconductor, Inc

tên linh kiện DSP56857
Giải thích chi tiết về linh kiện  Digitial Signal Controller
PDF  662 Pages
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nhà sản xuất  FREESCALE [Freescale Semiconductor, Inc]
Trang chủ  http://www.freescale.com
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DSP56857 bảng dữ liệu(HTML) 306 Page - Freescale Semiconductor, Inc

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Signal Descriptions
5685X Digital Signal Controller User Manual, Rev. 4
12-6
Freescale Semiconductor
12.3.2.1 ESSI Transmit Clock (SCK)
This pin can be configured as either an input or an output pin. This clock signal is used by all the
enabled transmitters and the receiver in Synchronous modes or by Transmitter 0 in Asynchronous
modes. Please see Table 12-3 for details about how to configure this pin.
Note:
Although an external serial clock can be independent of and asynchronous to the
system clock, the external ESSI clock frequency must not exceed FIPBus_CLK/4, and
each ESSI clock phase must exceed the minimum of 1.5 IPBus_CLK cycles.
12.3.2.2 ESSI Serial Control Signal 0 (SC0)
The function of this signal is determined by the programmer selecting either Synchronous or
Asynchronous mode, according to data in Table 12-4. In Asynchronous mode, this signal is used
for the receive clock I/O. In Synchronous mode, this signal is used as the transmitter data out
Table 12-3. ESSI Clock Sources
Controls
RX Clock
TX Clock
SYN
SCKD
SCD0
Pin
Source
Pin
Direction
Asynchronous
0
0
0
SC0
External
SCK
External
0
0
1
SC0
Internal
SCK
External
0
1
0
SC0
External
SCK
Internal
0
1
1
SC0
Internal
SCK
Internal
Synchronous
1
0
x
SCK
External
SCK
External
1
1
x
SCK
Internal
SCK
Internal
Table 12-4. ESSI Frame Sync Sources
Controls
RX Clock Frame
Sync
TX Frame Sync
SYN
SCD2
SCD1
Pin
Source
Pin
Direction
Asynchronous
0
0
0
SC1
External
SC2
External
0
0
1
SC1
Internal
SC2
External
0
1
0
SC1
External
SC2
Internal
0
1
1
SC1
Internal
SC2
Internal
Synchronous
1
0
x
SC2
External
SC2
External
1
1
x
SC2
Internal
SC2
Internal



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