27
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
IDT72V3640/50/60/70/80/90 3.3V HIGH DENSITY SUPERSYNC IITM 36-BIT FIFO
1,024 x 36, 2,048 x 36, 4,096 x 36, 8,192 x 36, 16,384 x 36 and 32,768 x 36
OCTOBER 22, 2008
Figure 8. Read Cycle, Empty Flag and First Data Word Latency Timing (IDT Standard Mode)
NOTES:
1. tSKEW1 is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that
EF will go HIGH (after one RCLK cycle plus tREF). If the time between the rising edge
of WCLK and the rising edge of RCLK is less than tSKEW1, then
EF deassertion may be delayed one extra RCLK cycle.
2.
LD = HIGH.
3. First data word latency = tSKEW1 + 1*TRCLK + tREF.
NOTES:
1. tSKEW1 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that
FF will go HIGH (after one WCLK cycle pus tWFF). If the time between
the rising edge of the RCLK and the rising edge of the WCLK is less than tSKEW1, then the
FF deassertion may be delayed one extra WCLK cycle.
2.
LD = HIGH, OE = LOW, EF = HIGH
Figure 7. Write Cycle and Full Flag Timing (IDT Standard Mode)
NO OPERATION
RCLK
REN
4667 drw13
EF
tCLK
tCLKH
tCLKL
tENH
tREF
tA
tOLZ
tOE
Q0 - Qn
OE
WCLK
(1)
tSKEW1
WEN
D0 - Dn
tENS
tENH
tDS
tDH
D0
1
2
tOLZ
NO OPERATION
LAST WORD
D0
D1
tENS
tENH
tDS
tDH
tOHZ
LAST WORD
tREF
tENH
tENS
tA
tREF
tENS
tENH
D0 - Dn
WEN
RCLK
REN
tENH
Q0 - Qn
DATA READ
NEXT DATA READ
DATA IN OUTPUT REGISTER
tSKEW1
(1)
4667 drw12
WCLK
NO WRITE
1
2
1
2
tDS
NO WRITE
tWFF
tA
tENS
tSKEW1
(1)
tDS
tA
D X
tDH
tCLK
tCLKH
tCLKL
DX+1
tWFF
tDH
FF