7025E Datasheet, PDF (8/20 Pages) Maxwell Technologies – (8K x 16-Bit) Dual Port RAM High-Speed CMOS

(8K x 16-Bit) Dual Port RAM High-Speed CMOS
7025E
OPTIONS
Busy Logic Master
Busy Logic Slave
Interrupt Logic
Semaphore Logic
TABLE 12. 7025E TRUTH TABLE FOR ARBITRATION OPTIONS
INPUTS
OUTPUTS
CS
UB
LB
M/S
SEM
BUSY
INT
L
X
L
H
H Output Signal
--
L
L
X
H
H
L
X
L
L
H
Input Signal
--
L
L
X
L
H
L
X
L
X
H
L
L
X
X
H
--
Output Signal
H
X
X
H
L
H
--
H
X
X
L
L
HI-Z
TABLE 13. 7025E NON-CONTENTION READ/WRITE CONTROL
INPUTS ¹
OUTPUTS
MODE
CS
R/W
OE
UB
LB
SEM I/O8-I/O15 I/O0-I/O7
H
X
X
X
X
H
HI-Z
HI-Z Deselected power down
X
X
X
H
H
H
HI-Z
HI-Z Both bytes deselected:
Power down
L
L
X
L
H
H
DATAIN
HI-Z Write to upper byte only
L
L
X
H
L
H
HI-Z
DATAIN Write to lower byte only
L
L
X
L
L
H
DATAIN DATAIN Write to both bytes
L
H
L
L
H
H
DATAOUT
HI-Z Read upper byte only
L
H
L
H
L
H
HI-Z
DATAOUT Read lower byte only
L
H
L
L
L
H
DATAOUT DATAOUT Read both bytes
X
X
H
X
X
X
HI-Z
HI-Z Outputs disabled
1. AO_L - A12_L = AO_R-A12_R.
08.15.02 Rev 2
All data sheets are subject to change without notice 8
©2002 Maxwell Technologies
All rights reserved.