ADSP-21065 Analog Devices, ADSP-21065 Datasheet - Page 20

• Manufacturer Part Number: ADSP-21065
• Description: DSP Microcomputer
• Manufacturer: Analog Devices

ADSP-21065L
Synchronous Read/Write—Bus Slave
Use these specifications for ADSP-21065L bus master accesses of a slave’s IOP registers or internal memory (in multiprocessor
memory space). The bus master must meet these (bus slave) timing requirements.
Parameter
Timing Requirements:
t
t
t
t
t
t
t
Switching Characteristics:
t
t
t
t
NOTES
1
2
For two ADSP-21065Ls to communicate synchronously as master and slave, certain master and slave specification combinations
must be satisfied. Do not compare specification values directly to calculate master/slave clock skew margins for those specifications
listed below. The following table shows the appropriate clock skew margin.
t
See System Hold Time Calculation under Test Conditions for calculation of hold times given capacitive and dc loads.
SADRI
HADRI
SRWLI
HRWLI
RWHPI
SDATWH
HDATWH
SDDATO
DATTR
DACK
ACKTR
SRWLI
is specified when Multiprocessor Memory Space Wait State (MMSWS bit in WAIT register) is disabled; when MMSWS is enabled, t
Address, SW Setup Before CLKIN
Address, SW Hold Before CLKIN
RD/WR Low Setup Before CLKIN
RD/WR Low Hold After CLKIN
RD/WR Pulse High
Data Setup Before WR High
Data Hold After WR High
Data Delay After CLKIN
Data Disable After CLKIN
ACK Delay After CLKIN
ACK Disable After CLKIN
Master Specification
t
t
t
t
t
t
SSDATI
SACKC
DADRO
DRWL
DRDO
DWRO
(Max)
(Max)
(Max)
2
2
Table IV. Bus Master to Slave Skew Margins
1
Slave Specification
t
t
t
t
t
t
SDDATO
DACK
SADRI
SRWLI
HRWLI
HRWLI
(Max)
(Max)
Skew Margin
t
t
t
t
t
t
t
t
t
t
t
t
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK
Min
24.5 + 25 DT
21.0 + 21 DT
2.5
4.5
0.0
1.0 – 2 DT
1.0 – 2 DT
–2.50 – 5 DT
= 33.3 ns
= 30.0 ns
= 33.3 ns
= 30.0 ns
= 33.3 ns
= 30.0 ns
= 33.3 ns
= 30.0 ns
= 33.3 ns
= 30.0 ns
= 33.3 ns
= 30.0 ns
+ 1.50 ns
+ 3.00 ns
+ 2.25 ns
N/A
+ 2.75 ns
+ 1.50 ns
+ 1.25 ns
N/A
3.00 ns
N/A
3.75 ns
+ 2.25 ns
Max
4.0 + 8 DT
7.5 + 7 DT
31.75 + 21 DT
7.0 – 2 DT
29.5 + 20 DT
6.0 – 2 DT
SRWLI
(min) = 17.5 + 18 DT.
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns