emc643sp16ak Emlsi Inc., emc643sp16ak Datasheet - Page 51

• Manufacturer Part Number: emc643sp16ak
• Description: 4mx16 Bit Cellularram Ad-mux
• Manufacturer: Emlsi Inc.

Figure 38: Asynchronous WRITE Followed by Asynchronous READ
Note:
1. When configured for synchronous mode (BCR[15] = 0), CE# must remain HIGH for at least 5ns (
interval. Otherwise,
A/DQ[15:0]
UB#/LB#
A[21:16]
ADV#
WAIT
WE#
OE#
CE#
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
IH
IL
IH
IL
IH
IL
IH
IL
IH
IL
IH
IL
IH
OH
OL
IL
t
CPH is only required after CE#-controlled WRITEs.
t
t
t
AVS
AVS
AS
t
t
AS
Valid Address
Valid Address
AS
t
CVS
t
VP
t
t
t
t
AW
t
t
AW
VS
WP
AVH
AVH
t
t
CW
BW
t
DS
Valid Input
t
DH
High-Z
t
CPH
Note 1
51
t
CVS
t
VP
t
t
AVS
AVS
Valid Address
Valid Address
t
CPH) to schedule the appropriate refresh
t
t
AVH
AVH
t
BA
t
CO
t
AA
t
V
V
AADV
OH
OL
t
AA
4Mx16 CellularRAM AD-MUX
t
OEZ
t
OLZ
Don’t Care
EMC643SP16AK
t
OE
V
alid
Output
Undefined
t
t
HZ
HZ
t
BHZ
t
OHZ