adsp-21483 Analog Devices, Inc., adsp-21483 Datasheet - Page 34

• Manufacturer Part Number: adsp-21483
• Description: Sharc Processor
• Manufacturer: Analog Devices, Inc.

ADSP-21483/21486/21487/21488/21489
Memory Write—Bus Master
Use these specifications for asynchronous interfacing to memo-
ries. Note that timing for AMI_ACK, ADDR, DATA, AMI_RD,
AMI_WR, and strobe timing parameters only apply to asyn-
chronous access mode.
Table 29. Memory Write—Bus Master
1
2
3
4
5
Parameter
Timing Requirements
t
t
Switching Characteristics
t
t
t
t
t
t
t
t
t
t
W = (number of wait states specified in AMICTLx register) × t
H = (number of hold cycles specified in AMICTLx register) x t
AMI_ACK delay/setup: System must meet t
The falling edge of MSx is referenced.
Note that timing for AMI_ACK, ADDR, DATA, AMI_RD, AMI_WR, and strobe timing parameters only applies to asynchronous access mode.
See
For Write to Write: 1 + HC, for both same bank and different bank. For Write to Read: 3 SDCLK cycles + HC, for the same bank and different banks.
DAAK
DSAK
DAWH
DAWL
WW
DDWH
DWHA
DWHD
DATRWH
WWR
DDWR
WDE
Test Conditions on Page 56
AMI_ACK
ADDR
DATA
AMI_ACK Delay from Address, Selects
AMI_ACK Delay from AMI_WR Low
Address, Selects to AMI_WR Deasserted
Address, Selects to AMI_WR Low
AMI_WR Pulse Width
Data Setup Before AMI_WR High
Address Hold After AMI_WR Deasserted
Data Hold After AMI_WR Deasserted
Data Disable After AMI_WR Deasserted
AMI_WR High to AMI_WR, AMI_RD Low
Data Disable Before AMI_RD Low
AMI_WR Low to Data Enabled
for calculation of hold times given capacitive and dc loads.
t
DAWL
t
WDE
t
DAAK
DAAK
, or t
t
DSAK
DSAK
, for deassertion of AMI_ACK (low). For asynchronous assertion of AMI_ACK (high) user must meet t
Figure 21. Memory Write—Bus Master
2
Rev. PrA | Page 34 of 66 | March 2010
1, 3
1, 2
t
DAWH
4
5
2
SDCLK
t
SDCLK
DDWH
t
WW
Min
t
t
W – 1.3
t
H + 0.15
H + 0.02
TBD
t
2 × t
t
SDCLK
SDCLK
SDCLK
SDCLK
SDCLK
SDCLK
– 3.1+ W
– 2.7
– 3.0+ W
– 1.5+ H
– 3.5
– 4.11
Preliminary Technical Data
t
DATRWH
Max
t
W – 4.9
SDCLK
t
DWHD
t
– 9.7 + W
WWR
t
DWHA
t
DDWR
DAAK
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
or t
DSAK
.