IDT72V223 IDT [Integrated Device Technology], IDT72V223 Datasheet - Page 39

• Manufacturer Part Number: IDT72V223
• Description: 3.3 VOLT HIGH-DENSITY SUPERSYNC NARROW BUS FIFO
• Manufacturer: IDT [Integrated Device Technology]

OPTIONAL CONFIGURATIONS
WIDTH EXPANSION CONFIGURATION
signals of multiple devices. Status flags can be detected from any one
device. The exceptions are the EF and FF functions in IDT Standard mode
and the IR and OR functions in FWFT mode. Because of variations in skew
between RCLK and WCLK, it is possible for EF/FF deassertion and IR/OR
assertion to vary by one cycle between FIFOs. In IDT Standard mode, such
problems can be avoided by creating composite flags, that is, ANDing EF
of every FIFO, and separately ANDing FF of every FIFO. In FWFT mode,
NOTES:
1. Use an AND gate in IDT Standard mode, an OR gate in FWFT mode.
2. Do not connect any output control signals directly together.
3. FIFO #1 and FIFO #2 must be the same depth, but may be different word widths.
For the x18 Input or x18 Output bus Width: 512 x 36, 1,024 x 36, 2,048 x 36, 4,096 x 36, 8,192 x 36, 16,384 x 36, 32,768 x 36 and 65,536 x 36
For both x9 Input and x9 Output bus Widths: 1,024 x 18, 2,048 x 18, 4,096 x 18, 8,192 x 18, 16,284 x 18, 32,768 x 18, 65,536 x 18 and 131,072 x 18
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC II
IDT72V263/273/283/293/103/113 3.3V HIGH DENSITY SUPERSYNC II
8K x 18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9/18, 256K x 9/18, 512K x9
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
Word width may be increased simply by connecting together the control
GATE
FIRST WORD FALL THROUGH/
(1)
DATA IN
SERIAL INPUT (FWFT/SI)
FULL FLAG/INPUT READY (FF/IR) #1
MASTER RESET (MRS)
FULL FLAG/INPUT READY (FF/IR) #2
PARTIAL RESET (PRS)
RETRANSMIT (RT)
m + n
PROGRAMMABLE (PAF)
WRITE CLOCK (WCLK)
WRITE ENABLE (WEN)
HALF-FULL FLAG (HF)
D
0
- Dm
LOAD (LD)
m
Figure 29. Block Diagram of Width Expansion
72V223
72V233
72V243
72V253
72V263
72V273
72V283
72V293
FIFO
IDT
#1
Dm
m
+1
TM
Q
- Dn
39
n
NARROW BUS FIFO
0
- Qm
composite flags can be created by ORing OR of every FIFO, and separately
ORing IR of every FIFO.
72V243/72V253/72V263/72V273/72V283/72V293 devices. If x18 Input or
x18 Output bus Width is selected, D
input bus and Q
x9 Input and x9 Output bus Widths are selected, D
an 18-bit wide input bus and Q
bus. Any word width can be attained by adding additional IDT72V223/72V233/
72V243/72V253/72V263/72V273/72V283/72V293 devices.
TM
Figure 29 demonstrates a width expansion using two IDT72V223/72V233/
NARROW BUS FIFO
72V223
72V233
72V243
72V253
72V263
72V273
72V283
72V293
FIFO
IDT
#2
0
n
-Q
READ CLOCK (RCLK)
READ ENABLE (REN)
OUTPUT ENABLE (OE)
EMPTY FLAG/OUTPUT READY (EF/OR) #2
PROGRAMMABLE (PAE)
EMPTY FLAG/OUTPUT READY (EF/OR) #1
17
Qm
from each device form a 36-bit wide output bus. If both
+1
- Qn
0
-Q
8
from each device form an 18-bit wide output
0
-D
m + n
17
COMMERCIAL AND INDUSTRIAL
from each device form a 36-bit wide
TEMPERATURE RANGES
0
DATA OUT
-D
8
from each device form
4666 drw32
GATE
(1)