IDT72T20108L6-7BB IDT, Integrated Device Technology Inc, IDT72T20108L6-7BB Datasheet - Page 47

• Manufacturer Part Number: IDT72T20108L6-7BB
• Description: IC FIFO 327768X20 6-7NS 208BGA
• Manufacturer: IDT, Integrated Device Technology Inc
• Series: 72Tr

Specifications of IDT72T20108L6-7BB

• Function: Synchronous
• Memory Size: 640K (32K x 20)
• Access Time: 3.8ns
• Voltage - Supply: 2.375 V ~ 2.625 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 208-BGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Rate: -
• Other names: 72T20108L6-7BB

NOTE:
1. The O/P Register is the internal output register. Its contents are available on the Qn output bus only when RCS and OE are both active, LOW, that is the bus is not in High-
2. OE is LOW.
Cycle:
a&b. At this point the FIFO is empty, OR is HIGH.
c.
d .
e.
f.
g .
h .
i .
3. OE is LOW.
4. The truth table for EREN is shown below:
IDT72T2098/108/118/128 2.5V HIGH-SPEED TeraSync™ DDR/SDR FIFO 20-BIT/10-BIT CONFIGURATIONS
32K x 20/64K x 10, 64K x 20/128K x 10, 128K x 20/256K x 10, 256K x 20/512K x 10
D0 - Dn
ERCLK
Impedance state.
WCLK
EREN
RCLK
WEN
REN
RCS
Reg.
O/P
OR
Qn
RCS and REN are both disabled, the output bus is High-Impedance.
Word Wn+1 falls through to the output register, OR goes active, LOW.
RCS is HIGH, therefore the Qn outputs are High-Impedance. EREN goes LOW to indicate that a new word has been placed on the output register.
EREN goes HIGH, no new word has been placed on the output register on this cycle.
No Operation.
RCS is LOW on this cycle, therefore the Qn outputs go to Low-Impedance and the contents of the output register (Wn+1) are made available.
NOTE: In FWFT mode is important to take RCS active LOW at least one cycle ahead of REN, this ensures the word (Wn+1) currently in the output register is made
available for at least one cycle.
REN goes active LOW, this reads out the second word, Wn+2.
EREN goes active LOW to indicate a new word has been placed into the output register.
Word Wn+3 is read out, EREN remains active, LOW indicating a new word has been read out.
NOTE: Wn+3 is the last word in the FIFO.
This is the next enabled read after the last word, Wn+3 has been read out. OR flag goes HIGH and EREN goes HIGH to indicate that there is no new word available.
RCLK
↑
↑
↑
↑
↑
HIGH-Z
OR
0
0
0
0
1
t
ENS
t
DS
RCS
W
t
X
ERCLK
0
0
1
1
n+1
W
t
DH
n
t
Last Word
SKEW1
REN
t
0
1
0
1
X
DS
Figure 28. Echo RCLK and Echo REN
a
W
n+2
t
DH
EREN
1
0
1
1
1
1
b
t
DS
W
n+3
t
DH
2
t
ENH
c
t
t
t
REF
CLKEN
A
d
47
REN
REN
REN
REN Operation (FWFT Mode Only)
t
CLKEN
e
W
n+1
t
ENS
f
t
RCSLZ
t
ENS
W
n+1
g
t
t
t
A
A
CLKEN
W
W
COMMERCIAL AND INDUSTRIAL
n+2
n+2
h
TEMPERATURE RANGES
t
t
A
A
FEBRUARY 13, 2009
W
W
i
n+3
t
n+3
ENH
t
t
REF
CLKEN
5996 drw31