ad1812 Analog Devices, Inc., ad1812 Datasheet - Page 5

• Manufacturer Part Number: ad1812
• Description: Soundport Controller
• Manufacturer: Analog Devices, Inc.

REV. 0
TIMING PARAMETERS (GUARANTEED OVER OPERATING TEMPERATURE RANGE)
Parameter
IOW/IOR Strobe Width
IOW/IOR Rising to IOW/IOR Falling
Write Data Setup to IOW Rising
IOR Falling to Valid Read Data
AEN Setup to IOW/IOR Falling
AEN Hold from IOW/IOR Rising
Adr Setup to IOW/IOR Falling
Adr Hold from IOW/IOR Rising
DACK Rising to IOW/IOR Falling
IOW/IOR Rising to DACK Falling
DACK Setup to IOW/IOR Falling
Data Hold from IOR Rising
Data Hold from IOW Rising
DRQ Hold from IOW/IOR Falling
DACK Hold from IOW Rising
DACK Hold from IOR Rising
*Guaranteed, not tested.
Specifications subject to change without notice.
General Notes
Use the exact timing information given. Do not attempt to derive parameters from the addition or subtraction of others. While addition or subtraction would yield
meaningful results for an additional device, the values given in this data sheet reflect statistical variations and worst cases. Consequently, you cannot meaningfully add
up parameters to derive longer times. Note that all 8-bit DMA transfers occur on channels 0, 1, and 3, while all 16-bit DMA transfers occur on channels 5, 6, and 7.
(0, 1, 3, 5, 6, 7)
(0, 1, 3, 5, 6, 7)
(0, 1, 3, 5, 6, 7)
(0, 1, 3, 5, 6, 7)
PC_D (7:0) /
PC_D (15:0)
PC_D (7:0) /
PC_D (15:0)
PC_A (15:0)
DACK
DACK
DRQ
AEN
AEN
DRQ
IOR
IOR
Figure 3. DMA Read Cycle
Figure 1. PIO Read Cycle
t
AESU
t
DKSU1
t
t
ADSU
DKSU2
t
AESU
t
t
RDDV
RDDV
t
DRHD
t
t
STW
STW
t
AEHD
t
t
t
DKHD3
AEHD
DKHD1
t
t
DHD1
DHD1
t
ADHD
Symbol
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
STW
BWDN
WDSU
RDDV
AESU
AEHD
ADSU
ADHD
DKSU1
DKHD1
DKSU2
DHD1
DHD2
DRHD
DKHD2
DKHD3
–5–
(0, 1, 3, 5, 6, 7)
(0, 1, 3, 5, 6, 7)
(0, 1, 3, 5, 6, 7)
(0, 1, 3, 5, 6, 7)
PC_D (7:0) /
PC_D (15:0)
PC_A (15:0)
PC_D (7:0) /
PC_D (15:0)
DACK
DACK
AEN
DRQ
DRQ
IOW
AEN
IOW
Min
100
80
10
10
0
10
10
20
0
10
15
10
10
Figure 4. DMA Write Cycle
Figure 2. PIO Write Cycle
t
AESU
t
DKSU1
t
t
ADSU
DKSU2
t
AESU
Typ
t
WDSU
t
DRHD
t
t
STW
STW
t
WDSU
Max
40
20
25
AD1812
t
AEHD
t
t
DKHD2
DKHD1
t
DHD2
t
t
ADHD
DHD2
t
AEHD
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns