Renesas 7700 FAMILY User Manual page 382

When using external memory that outputs data for more than t
signal
Because the external memory outputs data for more than t
there will be a possibility of the tail of data colliding with the head of address. In such a case,
examine the method described below:
Cut the tail of data output from the external memory by using, for example, a bus buffer.
Use the Mitsubishi's memory chips that can be connected without a bus buffer.
Figures 17.1.13 to 17.1.20 show examples for how to use a bus buffer and the timing charts. Table
17.1.5 lists the memory chips that can be connected a without bus buffer. When using one of these
memory chips, the user can connect it to the user's microcomputer without a bus buffer because
timing parameters t
high within 10 ns after rising of E signal.)
Table 17.1.5 Memory chips that can be connected without bus buffer
Memory
EPROM
M5M27C256AK-85, -10, -12, -15
M5M27C512AK-10, -12, -15
M5M27C100K-12. -15
M5M27C101K-12, -15
M5M27C102K-12, -15
M5M27C201K, JK-10, -12, -15
M5M27C202K, JK-10, -12, -15
One-time PROM
M5M27C256AP, FP, VP, RV-12, -15
M5M27C512AP, FP-15
M5M27C100P-15
M5M27C101P, FP, J, VP, RV-15
M5M27C102P, FP, J, VP, RV-15
M5M27C201P, FP, J, VP, RV-12, -15
M5M27C202P, FP, J, VP, RV-12, -15
Flash memory
M5M28F101P, FP, J, VP, RV-10, -12, -15
M5M28F102FP, J, VP, RV-10, -12, -15
SRAM
M5M5256CP, FP, KP, VP, RV-55LL, -55XL,
-70LL, -70XL, -85LL, -85XL, -10LL, -10XL
M5M5278CP, FP, J-20, -20L
M5M5278CP, FP, J-25, -25L
M5M5278DP, J-12
M5M5278DP, FP, J-15, -15L
M5M5278DP, FP, J-20, -20L
Note: When the user want specifications of the memory chips listed above, add a comment "t
product, microcomputer and kit."
and t listed below are guaranteed. (However, the read signal must go
DF dis(OE)
_
Type description
7751 Group User's Manual
pzx(E-P1Z/P2Z)
t /t
DF dis(OE)
f(X
(Maximum)
15 ns
(when guaranteeing by
kit) (Note)
f(X
8 ns
f(X
f(X
10 ns
6 ns f(X
7 ns f(X
8 ns
APPLICATIONS
17.1 Memory expansion
after rising of E
pzx(E-P1Z/P2Z)
after rising of the E signal,
Conditions
) ≤ 20 MHz, at low–speed running
IN
) ≤ 40 MHz, at high–speed running
IN
) ≤ 25 MHz, at low–speed running
IN
) ≤ 25 MHz, at low–speed running
IN
) ≤ 40 MHz, at high–speed running
IN
) ≤ 25 MHz, at low–speed running
IN
/t
DF dis(OE)
_
_
15 ns
17–17