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參數資料
型號: ADSP-21160M
廠商: Analog Devices, Inc.
元件分類: 數字信號處理
英文描述: DSP Microcomputer
中文描述: DSP微機
文件頁數: 32/53頁
文件大?。?/td> 696K
代理商: ADSP-21160M
ADSP-21160M
32
REV. 0
DMA Handshake
These specifications describe the three DMA handshake
modes. In all three modes DMAR is used to initiate trans-
fers. For handshake mode, DMAG controls the latching or
enabling of data externally. For external handshake mode,
the data transfer is controlled by the ADDR31
0, RDx,
WRx, PAGE, MS3
0, ACK, and DMAG signals. For Paced
Master mode, the data transfer is controlled by ADDR31
0,
RDx, WRx, MS3
0, and ACK (not DMAG). For Paced
Master mode, the Memory Read-Bus Master, Memory
Write-Bus Master, and Synchronous Read/Write-Bus
Master timing specifications for ADDR31
0, RDx, WRx,
MS3
0, PAGE, DATA63
0, and ACK also apply.
Table 17. DMA Handshake
Parameter
Timing Requirements:
t
SDRC
t
WDR
t
SDATDGL
t
HDATIDG
t
DATDRH
t
DMARLL
t
DMARH
Switching Characteristics:
t
DDGL
t
WDGH
t
WDGL
t
HDGC
t
VDATDGH
t
DATRDGH
t
DGWRL
t
DGWRH
t
DGWRR
t
DGRDL
t
DRDGH
t
DGRDR
t
DGWR
Min
Max
Unit
DMARx Setup Before CLKIN
1
DMARx Width Low (Nonsynchronous)
2
Data Setup After DMAGx Low
3
Data Hold After DMAGx High
Data Valid After DMARx High
3
DMARx Low Edge to Low Edge
4
DMARx Width High
2
3
t
CCLK
+4.5
ns
ns
ns
ns
ns
ns
ns
0.75t
CK
7
2
t
CK
+10
t
CK
t
CCLK
+4.5
DMAGx Low Delay After CLKIN
DMAGx High Width
DMAGx Low Width
DMAGx High Delay After CLKIN
Data Valid Before DMAGx High
5
Data Disable After DMAGx High
6
WRx Low Before DMAGx Low
DMAGx Low Before WRx High
WRx High Before DMAGx High
7
RDx Low Before DMAGx Low
RDx Low Before DMAGx High
RDx High Before DMAGx High
7
DMAGx High to WRx, RDx, DMAGx
Low
Address/Select Valid to DMAGx High
Address/Select Hold after DMAGx High
W = (number of wait states specified in WAIT register) t
CK
.
HI = t
CK
(if data bus idle cycle occurs, as specified in WAIT register; otherwise HI = 0).
0.25t
CCLK
+1
0.5t
CCLK
1+HI
t
CK
0.5t
CCLK
1
t
CK
0.25t
CCLK
+1.5
t
CK
0.25t
CCLK
8
0.25t
CCLK
3
1.5
t
CK
0.5t
CCLK
2+W
1.5
1.5
t
CK
0.5t
CCLK
2+W
1.5
0.5t
CCLK
2+HI
0.25t
CCLK
+9
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
t
CK
0.25t
CCLK
+9
t
CK
0.25t
CCLK
+5
0.25t
CCLK
+1.5
2
2
2
2
t
DADGH
t
DDGHA
18
1
ns
ns
1
Only required for recognition in the current cycle.
2
Maximum throughput using DMARx/DMAGx handshaking equals t
WDR
+ t
DMARH
= (t
CCLK
+4.5) + (t
CCLK
+4.5)=34ns (29.4 MHz). This throughput limit
applies to non-synchronous access mode only.
3
t
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 t
DATDRH
after DMARx is brought high.
4
Use t
DMARLL
if DMARx transitions synchronous with CLKIN. Otherwise, use t
WDR
and t
DMARH
.
5
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
t
VDATDGH
= t
CK
.25t
CCLK
8 + (n
×
t
CK
) where n equals the number of extra cycles that the access is prolonged.
6
See
Example System Hold Time Calculation on page 44
for calculation of hold times given capacitive and dc loads.
7
This parameter applies for synchronous access mode only.
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