ADSP-21061 Analog Devices, ADSP-21061 Datasheet - Page 32

• Manufacturer Part Number: ADSP-21061
• Description: ADSP-2106x SHARC DSP Microcomputer Family
• Manufacturer: Analog Devices

DMA Handshake
These specifications describe the three DMA handshake modes.
In all three modes DMAR is used to initiate transfers. For hand-
shake mode, DMAG controls the latching or enabling of data
externally. For external handshake mode, the data transfer is
controlled by the ADDR
ACK and DMAG signals. For Paced Master mode, the data
Parameter
Timing Requirements:
t
t
t
t
t
t
t
t
Switching Characteristics:
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
W = (number of wait states specified in WAIT register) × t
HI = t
NOTES
1
2
3
4
ADSP-21061/ADSP-21061L
SDRLC
SDRHC
WDR
SDATDGL
HDATIDG
DATDRH
DMARLL
DMARH
DDGL
WDGH
WDGL
HDGC
DADGH
DDGHA
VDATDGH
DATRDGH
DGWRL
DGWRH
DGWRR
DGRDL
DRDGH
DGRDR
DGWR
Only required for recognition in the current cycle.
t
t
See System Hold Time Calculation under Test Conditions for calculation of hold times given capacitive and dc loads.
data can be driven t
n equals the number of extra cycles that the access is prolonged.
SDATDGL
VDATDGH
CK
(if an address hold cycle or bus idle cycle occurs, as specified in WAIT register; otherwise HI = 0).
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
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
DMARx Low Setup before CLKIN
DMARx High Setup before CLKIN
DMARx Width Low (Nonsynchronous)
Data Setup after DMAGx Low
Data Hold after DMAGx High
Data Valid after DMARx High
DMAGx Low Edge to Low Edge
DMAGx Width High
DMAGx Low Delay after CLKIN
DMAGx High Width
DMAGx Low Width
DMAGx High Delay after CLKIN
Address Select Valid to DMAGx High
Address Select Hold to DMAGx High
Data Valid before DMAGx High
Data Disable after DMAGx High
WR Low before DMAGx Low
DMAGx Low before WR High
WR High before DMAGx High
RD Low before DMAGx Low
RD Low before DMAGx High
RD High before DMAGx High
DMAGx High to WR, RD, DMAGx Low
DATDRH
after DMARx is brought high.
31-0
, RD, WR, SW, PAGE, MS
2
2
3
4
1
1
CK
.
Min
5
5
6
2
23 + 7DT/8
6
9 + DT/4
6 + 3DT/8
12 + 5DT/8
–2 – DT/8
17 + DT
–0.5
8 + 9DT/16
0
0
10 + 5DT/8 + W
1 + DT/16
0
11 + 9DT/16 + W
0
5 + 3DT/8 + HI
3-0
,
ADSP-21061 (5 V)
transfer is controlled by ADDR
(not DMAG). For Paced Master mode, the Memory Read–Bus
Master, Memory Write–Bus Master, and Synchronous Read/
Write–Bus Master timing specifications for ADDR
WR, MS
Max
10 + 5DT/8
16 + 7DT/8
15 + DT/4
6 – DT/8
7
2
3 + DT/16
2
3
3-0
, SW, PAGE, DATA
Min
5
5
6
2
23.5 + 7DT/8
6
9 + DT/4
6 + 3DT/8
12 + 5DT/8
–2 – DT/8
17 + DT
–1.0
8 + 9DT/16
0
0
10 + 5DT/8 + W
1 + DT/16
0
11 + 9DT/16 + W
0
5 + 3DT/8 + HI
ADSP-21061L (3.3 V)
31-0
VDATDGH
47-0
, RD, WR, MS
and ACK also apply.
= 8 + 9DT/16 + (n × t
Max
10 + 5DT/8
16 + 7DT/8
15 + DT/4
6 – DT/8
7
2
3 + DT/16
2
3
3-0
and ACK
31-0
, RD,
CK
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
) where