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參數資料
型號: ADSP-21363SBBC-ENG
廠商: ANALOG DEVICES INC
元件分類: 數字信號處理
英文描述: SHARC Processor
中文描述: 16-BIT, 55.55 MHz, OTHER DSP, PBGA136
封裝: MO-205AE, MBGA-136
文件頁數: 25/44頁
文件大小: 396K
代理商: ADSP-21363SBBC-ENG
ADSP-21363
Preliminary Technical Data
Rev. PrA
|
Page 25 of 44
|
September 2004
Table 21. 16-bit Memory Read Cycle
Parameter
Timing Requirements
t
DRS
t
DRH
Min
Max
Unit
Address/Data 15–0 Setup Before RD High
Address/Data 15–0 Hold After RD High
3.3
0
ns
ns
Switching Characteristics
t
ALEW
t
ADAS
1
t
ALERW
t
RRH
t
RWALE
t
RDDRV
t
ADAH
1
t
ALEHZ
1
t
RW
D = (Data Cycle Duration = the value set by the PPDUR bits (5–1) in the PPCTL register) × t
PCLK
H = t
PCLK
(if a hold cycle is specified, else H = 0)
F = 7 x t
PCLK
(if FLASH_MODE is set else F = 0)
1
On reset, ALE is an active high cycle. However, it can be configured by software to be active low.
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ALE Pulse Width
Address/Data 15–0 Setup Before ALE Deasserted
ALE Deasserted to Read Asserted
Delay Between RD Rising Edge to Next Falling Edge.
Read Deasserted to ALE Asserted
RD Address Drive After Read High
Address/Data 15–0 Hold After ALE Deasserted
ALE Deasserted to Address/Data15–0 in High Z
RD Pulse Width
2 × t
PCLK
– 2
t
PCLK
– 2.5
2 × t
PCLK
– 2
H + t
PCLK
– 1
F + H + 0.5
F + H + t
PCLK
– 1
t
PCLK
– 0.8
t
PCLK
– 0.8
D – 2
Figure 18. Read Cycle For 16-Bit Memory Timing
AD15-0
WR
t
DRS
t
DRH
t
RDDRV
t
ALEHZ
t
ADAH
t
ADAS
VALID ADDRESS
VALID DATA
VALID
ADDRESS
t
ALEW
t
RW
t
ALERW
t
RWALE
t
RRH
ALE
RD
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