Cypress CY7C68015A Manual De Usuario
CY7C68013A, CY7C68014A
CY7C68015A, CY7C68016A
CY7C68015A, CY7C68016A
Document #: 38-08032 Rev. *L
Page 39 of 62
10.3 Data Memory Read
Figure 13. Data Memory Read Timing Diagram
data in
t
CL
A[15..0]
t
AV
t
AV
RD#
t
STBL
t
STBH
t
DH
D[7..0]
data in
t
ACC1
t
DSU
Stretch = 0
Stretch = 1
t
CL
A[15..0]
t
AV
RD#
t
DH
D[7..0]
t
ACC1
t
DSU
CS#
CS#
t
SCSL
OE#
t
SOEL
CLKOUT
CLKOUT
Table 16. Data Memory Read Parameters
Parameter
Description
Min
Typ
Max
Unit
Notes
t
CL
1/CLKOUT Frequency
20.83
ns
48 MHz
41.66
ns
24 MHz
83.2
ns
12 MHz
t
AV
Delay from Clock to Valid Address
10.7
ns
t
STBL
Clock to RD LOW
11
ns
t
STBH
Clock to RD HIGH
11
ns
t
SCSL
Clock to CS LOW
13
ns
t
SOEL
Clock to OE LOW
11.1
ns
t
DSU
Data Setup to Clock
9.6
ns
t
DH
Data Hold Time
0
ns
When using the AUTPOPTR1 or AUTOPTR2 to address external memory, the address of AUTOPTR1 is only active while either
RD# or WR# are active. The address of AUTOPTR2 is active throughout the cycle and meets the above address valid time for
which is based on the stretch value
RD# or WR# are active. The address of AUTOPTR2 is active throughout the cycle and meets the above address valid time for
which is based on the stretch value
Note
19. t
ACC2
and t
ACC3
are computed from the above parameters as follows:
t
ACC2
(24 MHz) = 3*t
CL
– t
AV
–t
DSU
= 106 ns
t
ACC2
(48 MHz) = 3*t
CL
– t
AV
– t
DSU
= 43 ns
t
ACC3
(24 MHz) = 5*t
CL
– t
AV
–t
DSU
= 190 ns
t
ACC3
(48 MHz) = 5*t
CL
– t
AV
– t
DSU
= 86 ns.