參數(shù)資料
型號: ADSP-21060CW-160
廠商: Analog Devices Inc
文件頁數(shù): 30/64頁
文件大?。?/td> 0K
描述: IC DSP CONTROLLER 32BIT 240CQFP
產品培訓模塊: SHARC Processor Overview
標準包裝: 1
系列: SHARC®
類型: 浮點
接口: 主機接口,連接端口,串行端口
時鐘速率: 40MHz
非易失內存: 外部
芯片上RAM: 512kB
電壓 - 輸入/輸出: 5.00V
電壓 - 核心: 5.00V
工作溫度: -40°C ~ 100°C
安裝類型: 表面貼裝
封裝/外殼: 240-CBFQFP 裸露焊盤
供應商設備封裝: 240-CQFP(32x32)
包裝: 托盤
Rev. F
|
Page 36 of 64
|
March 2008
ADSP-21060/ADSP-21060L/ADSP-21062/ADSP-21062L/ADSP-21060C/ADSP-21060LC
DMA Handshake
These specifications describe the three DMA handshake modes.
In all three modes, DMARx is used to initiate transfers. For
Handshake mode, DMAGx controls the latching or enabling of
data externally. For External handshake mode, the data transfer
is controlled by the ADDR31–0, RD, WR, PAGE, MS3–0, ACK,
and DMAGx signals. For Paced Master mode, the data transfer
is controlled by ADDR31–0, RD, WR, MS3–0, and ACK (not
DMAG). For Paced Master mode, the Memory Read-Bus Mas-
ter, Memory Write-Bus Master, and Synchronous Read/Write-
Bus Master timing specifications for ADDR31–0, RD, WR,
MS3–0, PAGE, DATA63–0, and ACK also apply.
Table 22. DMA Handshake
5 V and 3.3 V
Unit
Parameter
Min
Max
Timing Requirements
tSDRLC
DMARx Low Setup Before CLKIN1
5ns
tSDRHC
DMARx High Setup Before CLKIN1
5ns
tWDR
DMARx Width Low (Nonsynchronous)
6
ns
tSDATDGL
Data Setup After DMAGx Low2
10 + 5DT/8
ns
tHDATIDG
Data Hold After DMAGx High
2
ns
tDATDRH
Data Valid After DMARx High2
16 + 7DT/8
ns
tDMARLL
DMARx Low Edge to Low Edge
23 + 7DT/8
ns
tDMARH
DMARx Width High2
6ns
Switching Characteristics
tDDGL
DMAGx Low Delay After CLKIN
9 + DT/4
15 + DT/4
ns
tWDGH
DMAGx High Width
6 + 3DT/8
ns
tWDGL
DMAGx Low Width
12 + 5DT/8
ns
tHDGC
DMAGx High Delay After CLKIN
–2 – DT/8
6 – DT/8
ns
tVDATDGH
Data Valid Before DMAGx High3
8 + 9DT/16
ns
tDATRDGH
Data Disable After DMAGx High4
07
ns
tDGWRL
WR Low Before DMAGx Low5
02
ns
tDGWRH
DMAGx Low Before WR High
10 + 5DT/8 + W
ns
tDGWRR
WR High Before DMAGx High
1 + DT/16
3 + DT/16
ns
tDGRDL
RD Low Before DMAGx Low
0
2
ns
tDRDGH
RD Low Before DMAGx High
11 + 9DT/16 + W
ns
tDGRDR
RD High Before DMAGx High
0
3
ns
tDGWR
DMAGx High to WR, RD, DMAGx Low
5 + 3DT/8 + HI
ns
tDADGH
Address/Select Valid to DMAGx High
17 + DT
ns
tDDGHA
Address/Select Hold After DMAGx High6
–0.5
ns
W = (number of wait states specified in WAIT register)
tCK.
HI = tCK (if data bus idle cycle occurs, as specified in WAIT register; otherwise HI = 0).
1 Only required for recognition in the current cycle.
2 t
SDATDGL is the data setup requirement if DMARx is not being used to hold off completion of a write. Otherwise, if DMARx low holds off completion of the write, the data can
be driven tDATDRH after DMARx is brought high.
3 t
VDATDGH is valid if DMARx is not being used to hold off completion of a read. If DMARx is used to prolong the read, then tVDATDGH =tCK –0.25tCCLK –8+(n×tCK) where n equals
the number of extra cycles that the access is prolonged.
4 See Example System Hold Time Calculation on Page 47 for calculation of hold times given capacitive and dc loads.
5 For ADSP-21062/ADSP-21062L specification is –2.5 ns min, 2 ns max.
6 For ADSP-21060L/ADSP-21062L specification is –1 ns min.
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