adsp-2186n Analog Devices, Inc., adsp-2186n Datasheet - Page 39

• Manufacturer Part Number: adsp-2186n
• Description: Dsp Microcomputer
• Manufacturer: Analog Devices, Inc.

IDMA Read, Short Read Cycle in Short Read Only Mode
Table 26. IDMA Read, Short Read Cycle in Short Read Only Mode
1
2
3
Parameter
Timing Requirements:
t
t
Switching Characteristics:
t
t
t
t
t
Short Read Only is enabled by setting Bit 14 of the IDMA overlay Register to 1 (0x3FE7). Short Read Only can be enabled by the processor core writing to the register
Start of Read = IS Low and IRD Low. Previous data remains until end of read.
End of Read = IS High or IRD High.
IKR
IRP
IKHR
IKDH
IKDD
IRDE
IRDV
or by an external host writing to the register. Disabled by default.
1
IACK Low Before Start of Read
Duration of Read
IACK High After Start of Read
IAD15–0 Previous Data Hold After End of Read
IAD15–0 Previous Data Disabled After End of Read
IAD15–0 Previous Data Enabled After Start of Read
IAD15–0 Previous Data Valid After Start of Read
3
IA D 15–0
Figure 37. IDMA Read, Short Read Cycle in Short Read Only Mode
L EG EN D :
IA CK
IRD
IM PL IES TH A T IS A N D IR D C A N B E
HE LD IN D E FIN ITE LY B Y H O S T
IS
2
2
t
IK R
Rev. A | Page 39 of 48 | August 2006
t
IR D E
t
IK H R
t
IR D V
3
3
t
IR P
PR E V IO U S
D A TA
t
IK D D
Min
0
10
0
0
t
IK D H
Max
10
10
10
ADSP-218xN
Unit
ns
ns
ns
ns
ns
ns
ns