DSP16410CG Datasheet, PDF (119/314 Pages) Agere Systems – DSP16410CG Digital Signal Processor

Data Sheet
May 2003
DSP16410CG Digital Signal Processor
4 Hardware Architecture (continued)
4.14 System and External Memory Interface (SEMI) (continued)
4.14.5 Asynchronous Memory (continued)
4.14.5.2 Extending Access Time Via the ERDY Pin (continued)
Figure 31 illustrates an example read and write operation using the ERDY pin to extend the accesses.
ECKO
Use of ERDY Pin to Extend Asynchronous Accesses
ERAMN
ERDY
ERWN
YATIME
SAMPLE
POINT
STALL
4T
YATIME
SAMPLE
POINT
STALL
4T
EA
A0
A1
ED
Q1
D1
ERAM
READ
HIGH-IMPEDANCE OUTPUT
ERAM
WRITE
DON’T CARE
Notes:
It is assumed that ECKO is programmed as CLK, i.e., the ECKO[1:0] field (ECON1[1:0]—Table 60 on page 111) is programmed to 0x1.
It is assumed that the YATIME[3:0] field (ECON0[7:4]—Table 59 on page 110) is programmed to 0x7.
Figure 31. Example of Using the ERDY Pin
Agere Systems Inc.
Agere Systems—Proprietary
119
Use pursuant to Company instructions