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DSP56857 bảng dữ liệu(PDF) 141 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
Logo FREESCALE - Freescale Semiconductor, Inc

DSP56857 bảng dữ liệu(HTML) 141 Page - Freescale Semiconductor, Inc

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Timing Specifications
External Memory Interface (EMI), Rev. 4
Freescale Semiconductor
5-15
Note:
INT_SYS_CLK is the internal system clock from which everything is referenced.
Figure 5-9. External Read Cycle with RWS = 1, RWSH = 0 and RWSS = 0
5.7.1.2 Read Setup and Hold Timing
Although most memory devices can perform consecutive reads by holding the CSn and RD(OE)
signals in the active state and changing the address, there are peripheral devices that require
RD(OE) to transition to the inactive state between reads of certain registers. This timing can be
accommodated with the Read Setup (RWSS) and/or Read Hold (RWSH) control fields illustrated
in Figure 5-10 and Figure 5-11.
Time added to Figure 5-8 by setting RWS = 1
tACCESS
tOHZ
tACCESS
tOEV
tRH
tRL
tCSV
tAV
tAV
tRDH
tCSRH
tCLKA
tRC
Read (RWS = 1)
Read (RWS = 1)
IDLE
tC
tRSD
tRSDP
tRSD
tRSDP
tRHD
tRSD
tRSDP
Data In
Data In
Data In
int_sys_clk
int_sys_clk_delay
A[23:0], PS, DS
CS[7:0]
RD
, OE
WR
D[15:0]
Read (RWS = 1)



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