IDT71216
BiCMOS 16K x 15 CACHE-TAG RAM
TRUTH TABLES
COMMERCIAL TEMPERATURE RANGE
CHIP SELECT, RESET, AND POWER-DOWN FUNCTIONS(1, 2)
CS1 CS2 RESET PWRDN CLK WET WES TAOE TAG VLDOUT DTYOUT WTOUT MATCH
CHIP SELECT FUNCTION
HX X
H
XX X
X
Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z
XL X
H
XX X
X
Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z
LH X
H
XX X
X
RESET FUNCTION
–
–
–
–
–
LH L
H
↑HH
L
Hi-Z L(3)
L(3)
L(3)
L(3)
LH L
H
↑HH
H
Hi-Z L(3)
L(3)
L(3)
L(3)
HX L
H
↑HH
X
Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z
XL L
H
↑HH
X
Hi-Z Hi-Z Hi-Z Hi-Z Hi-Z
XX L
H
↑L X
X
–
–
–
–
–
XX L
H
↑X L
X
POWER-DOWN FUNCTION
–
–
–
–
–
XX X
L
XH H
X
Hi-Z
NOTES:
1. "H" = VIH, "L" = VIL, "X" = don't care, "–" = unrelated.
2. OET, OES, TT1, TAH, TAIN and SFUNC are "X" for this table.
3. OES is LOW.
Hi-Z
Hi-Z
Hi-Z Hi-Z
TA OPERATION POWER
Hi-Z Deselected Active
Hi-Z Deselected Active
–
Selected Active
H Reset Status Active
Hi-Z Reset Status Active
Hi-Z Reset Status Active
Hi-Z Reset Status Active
– Not Allowed –
– Not Allowed –
Hi-Z Power-down Standby
3067 tbl 02
READ AND WRITE FUNCTIONS(1, 2)
OET OES WET WES CLK TT1 TAG VLDIN DTYIN WTIN VLDOUT DTYOUT WTOUT
READ FUNCTION
MATCH
OPERATION
L XHX
X
X
DOUT –
XLXX
XX
–
–
HXXX
XX
Hi-Z –
XHXX
XX
–
–
WRITE FUNCTION
–
–
–
–
–
DOUT Read TAG I/O
–
–
DOUT DOUT DOUT
DOUT Read Status Bits
–
–
–
–
–
DOUT TAG I/O Disable
–
–
Hi-Z Hi-Z Hi-Z
DOUT Status Disabled
HXL X
↑X
DIN
–
–
–
DOUT DOUT DOUT
L
Write TAG I/O
LXLX
↑X
–
–
–
–
–
–
–
–
Not Allowed
XLXL
↑X
–
DIN
DIN DIN DOUT(3) DOUT(3) DOUT(3)
L
Write Status Bits
XHX L
↑X
–
DIN
DIN DIN Hi-Z Hi-Z Hi-Z
L
Write Status Bits
NOTES:
1. "H" = VIH, "L" = VIL, "X" = don't care, "–" = unrelated.
2. This table applies when CS1 is LOW and CS2, RESET, and PWRDN are HIGH. TAOE, TAH, TAIN and SFUNC are "X" for this table.
3. DOUT in this case is the same as DIN; that is, the input data is written through to the outputs during the write operation.
3067 tbl 03
14.3
4