ADSP21020 AD [Analog Devices], ADSP21020 Datasheet - Page 16

• Manufacturer Part Number: ADSP21020
• Description: 32/40-Bit IEEE Floating-Point DSP Microprocessor
• Manufacturer: AD [Analog Devices]

ADSP-21020
Bus Request/Bus Grant
Parameter
Timing Requirement:
t
t
Switching Characteristic:
t
t
t
t
NOTES
*DT = t
Memory Interface = PMA23-0, PMD47-0, PMS1-0, PMRD, PMWR, PMPAGE, DMA31-0, DMD39-0, DMS3-0, DMRD, DMWR, DMPAGE.
Buses are not granted until completion of current memory access.
See the Memory Interface chapter of the ADSP-21020 User’s Manual for BG, BR cycle relationships.
HBR
SBR
DMDBGL
DME
DBGL
DBGH
INTERFACE
CK
MEMORY
– 50 ns.
BR Hold after CLKIN High
BR Setup before CLKIN High
Memory Interface Disable to BG Low –2
CLKIN High to Memory Interface
Enable
CLKIN High to BG Low
CLKIN High to BG High
CLKIN
BR
BG
t
HBR
t
SBR
K/B/T Grade K/B/T Grade B/T Grade
Min
0
18
25
Figure 8. Bus Request/Bus Grant
20 MHz
Max
22
22
t
DBGL
Min
0
15
–2
20
25 MHz
–16–
t
DMDBGL
Max Min Max Min Max Min
22
22
0
13
–2
16
30 MHz
22
22
0
12
–2
15
33.3 MHz Frequency Dependency*
t
K Grade
HBR
22
22
t
SBR
18 + 5DT/16
25 + DT/2
t
t
DBGH
DME
Max
REV. C
Unit
ns
ns
ns
ns
ns
ns