IDT7200L IDT [Integrated Device Technology], IDT7200L Datasheet - Page 9

• Manufacturer Part Number: IDT7200L
• Description: CMOS ASYNCHRONOUS FIFO 256 x 9, 512 x 9, 1,024 x 9
• Manufacturer: IDT [Integrated Device Technology]

XI
W
R
IDT7200/7201A/7202A CMOS ASYNCHRONOUS FIFO
256 x 9, 512 x 9 and 1,024 x 9
HF
XO
OPERATING MODES:
monitored by each system (i.e.
where
used). For additional information, refer to Tech Note 8: Oper-
ating FIFOs on Full and Empty Boundary Conditions and
Tech Note 6: Designing with FIFOs.
Single Device Mode
application requirements are for 256/512/1,024 words or less.
These devices are in a Single Device Configuration when the
Expansion In (
Depth Expansion
cations when the requirements are for greater than 256/512/
1,024 words. Figure 14 demonstrates Depth Expansion using
three IDT7200/7201A/7202As. Any depth can be attained by
W
W
R
R
A single IDT7200/7201A/7202A may be used when the
The IDT7200/7201A/7202A can easily be adapted to appli-
Care must be taken to assure that the appropriate flag is
W
is used;
XI
HALF-FULL OR LESS
LAST PHYSICAL
) control input is grounded (see Figure 12).
EF
LOCATION
WRITE TO
t
t
XIS
XOL
is monitored on the device where
FIRST PHYSICAL
t
XI
LOCATION
WRITE TO
FF
is monitored on the device
t
WHF
t
XOH
t
Figure 9. Half-Full Flag Timing
XIR
Figure 10. Expansion Out
Figure 11. Expansion In
R
MORE THAN HALF-FULL
is
MILITARY, INDUSTRIAL AND COMMERCIAL TEMPERATURE RANGES
adding additional IDT7200/7201A/7202As. These FIFOs
operate in the Depth Expansion mode when the following
conditions are met:
1. The first device must be designated by grounding the First
2. All other devices must have
3. The Expansion Out (
4. External logic is needed to generate a composite Full Flag
5. The Retransmit (
ing FIFOs or FIFO Modules.
For additional information, refer to Tech Note 9: Cascad-
Load (
to the Expansion In (
14.
(
EF
the correct composite
not available in the Depth Expansion Mode.
LAST PHYSICAL
FF
READ FROM
s and ORing of all
LOCATION
) and Empty Flag (
t
t
XIS
XOL
FIRST PHYSICAL
FL
READ FROM
LOCATION
) control input.
t
RT
RHF
) function and Half-Full Flag (
XI
XO
FF
EF
) pin of the next device. See Figure
FF
s (i.e. all must be set to generate
) pin of each device must be tied
). This requires the ORing of all
or
t
XOH
EF
FL
). See Figure 14.
in the high state.
HALF-FULL OR LESS
2679 drw 12
2679 drw 13
2679 drw 11
HF
) are
9