參數(shù)資料
型號: SPAK56F826BU80
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 數(shù)字信號處理
英文描述: 16-BIT, 80 MHz, OTHER DSP, PQFP100
封裝: LQFP-100
文件頁數(shù): 21/53頁
文件大?。?/td> 829K
代理商: SPAK56F826BU80
28
DSP56F826 Preliminary Technical Data
MOTOROLA
Address Valid to RD Asserted
tARDA
-4.4
ns
RD Asserted to Input Data Valid
Wait states = 0
Wait states > 0
tRDD
2.4
(T*WS) + 2.4
ns
WR Deasserted to RD Asserted
tWRRD
6.8
ns
RD Deasserted to RD Asserted
tRDRD
0
ns
WR Deasserted to WR Asserted
tWRWR
14.1
ns
RD Deasserted to WR Asserted
tRDWR
12.8
ns
1.
Timing is both wait state and frequency dependent. In the formulas listed, WS = the number of wait states and
T = Clock Period. For 80MHz operation, T = 12.5ns.
2.
Parameters listed are guaranteed by design.
To calculate the required access time for an external memory for any frequency < 80Mhz, use this formula:
Top = Clock period @ desired operating frequency
WS = Number of wait states
Memory Access Time = (Top*WS) + (Top- 11.5)
Figure 15. External Bus Asynchronous Timing
Table 14. External Bus Asynchronous Timing1, 2 (Continued)
Operating Conditions: VSSIO=VSS = VSSA = 0V, VDDA =VDDIO=3.0–3.6V, VDD = 2.25–2.75V, TA = –40° to +85°C, CL ≤ 50 pF, fop = 80 MHz
Characteristic
Symbol
Typical Min
Typical Max
Unit
A0–A15,
PS, DS
(See Note)
WR
D0–D15
RD
Note: During read-modify-write instructions and internal instructions, the address lines do not change state.
Data In
Data Out
tAWR
tARDA
tARDD
tRDA
tRD
tRDRD
tRDWR
tWRWR
tWR
tDOS
tWRD
tWRRD
tAD
tDOH
tDRD
tRDD
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