IDT72V2101 IDT [Integrated Device Technology], IDT72V2101 Datasheet - Page 25

• Manufacturer Part Number: IDT72V2101
• Description: 3.3 VOLT HIGH DENSITY CMOS SUPERSYNC FIFO
• Manufacturer: IDT [Integrated Device Technology]

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
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.
IDT72V2101/72V2111 3.3V HIGH DENSITY CMOS
SUPERSYNC FIFO
Word width may be increased simply by connecting together the control
GATE
(1)
FIRST WORD FALL THROUGH/
DATA IN
SERIAL INPUT (FWFT/SI)
PARTIAL RESET (PRS)
MASTER RESET (MRS)
FULL FLAG/INPUT READY (FF/IR) #2
FULL FLAG/INPUT READY (FF/IR)
TM
RETRANSMIT (RT)
262,144 x 9, 524,288 x 9
m + n
WRITE CLOCK (WCLK)
PROGRAMMABLE (PAF)
WRITE ENABLE (WEN)
Figure 19. Block Diagram of 262,144 x 18 and 524,288 x 18 Width Expansion
HALF-FULL FLAG (HF)
D
0
- Dm
LOAD (LD)
m
#1
72V2101
72V2111
FIFO
IDT
#1
Dm
m
+1
- Dn
Q
25
0
n
- Qm
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,
composite flags can be created by ORing OR of every FIFO, and separately
ORing IR of every FIFO.
72V2111 devices. D
Q
be attained by adding additional IDT72V2101/72V2111 devices.
0
-Q
Figure 19 demonstrates a width expansion using two IDT72V2101/
72V2101
72V2111
8
FIFO
from each device form an 18-bit wide output bus. Any word width can
IDT
#2
READ CLOCK (RCLK)
n
READ ENABLE (REN)
OUTPUT ENABLE (OE)
EMPTY FLAG/OUTPUT READY (EF/OR) #2
PROGRAMMABLE (PAE)
EMPTY FLAG/OUTPUT READY (EF/OR) #1
0
Qm
- D
+1
8
from each device form an 18-bit wide input bus and
- Qn
COMMERCIAL AND INDUSTRIAL
m + n
TEMPERATURE RANGES
DATA OUT
4669 drw 22
GATE
(1)