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参数资料
型号： IDT72V51246L7-5BB
厂商： IDT, Integrated Device Technology Inc
文件页数： 27/56页
文件大小： 0K
描述： IC FLOW CTRL MULTI QUEUE 256-BGA
标准包装： 1
类型： 多队列流量控制
安装类型： 表面贴装
封装/外壳： 256-BBGA
供应商设备封装： 256-BGA（17x17）
包装： 托盘
其它名称： 72V51246L7-5BB
33
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
IDT72V51236/72V51246/72V51256 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES
(4 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits
Figure
9.
Write
Queue
Select,
Write
Operation
and
Full
Flag
Operation
WCLK
WADEN
tQH
tQS
tAH
tAS
WRADD
Q
x
FF
tWFF
5937
drw13
WEN
tENS
tAH
tAS
Q
y
tQH
tQS
tDH
tDS
Q
X
W
D
tDH
Q
y
W
D-2
W
D-1
Q
y
tDH
Din
tWFF
Previous
Q
Status
No
Writes
Queue
Full
*A*
*B*
*C*
*D*
*E*
*F*
*G*
tDS
Q
y
W
D
tDS
tDH
tENH
tWFF
RCLK
tSKEW 1
tQS
tQH
REN
tENS
RDADD
Q
y
RADEN
Qout
tA
Previous
Q,
Word,
W
Previous
Q,
W
+1
PFT
tA
Qy,
W
0
PFT
tA
Qy,
W
1
Qy,
W
2
*H*
*I*
*J*
tAS
tAH
*A
A*
*BB*
*CC*
*D
D
*
*EE*
*FF*
tDS
NOTE
:
OE
is
active
LOW.
Cycle
:
*A*
Queue,
Qx
is
selected
on
the
write
port.
The
FF
flag
is
providing
status
of
a
previously
selected
queue,
within
the
same
device.
*AA*
Queue,
Qy
is
selected
for
read
operations.
*B*
The
FF
flag
output
updates
to
show
the
status
of
Qx,
it
is
not
full.
*BB*
Word
W+1
is
read
from
the
previous
queue
regardless
of
REN
due
to
FWFT.
*C*
Word,
Wd
is
written
into
Qx.
This
causes
Qx
to
go
full.
*CC*
Word,
W0
is
read
from
Qy
regardless
of
REN
,this
is
due
to
the
FWFT
effect.
*D*
Queue,
Qy
is
selected
within
the
same
device
as
Qx.
A
write
to
Qx
cannot
occur
on
this
cycle
because
it
is
full,
FF
is
LOW.
*DD*
No
reads
occur,
REN
is
HIGH.
*E*
Again,
a
write
to
Qx
cannot
occur
on
this
cycle
because
it
is
full,
FF
is
LOW.
The
FF
flag
updates
after
time
t
WFF
to
show
that
queue,
Qy
is
not
full.
*EE*
Word,
W1
is
read
from
Qy,
this
causes
Qy
to
go
“not
full”,
FF
flag
goes
HIGH
after
time,
t
SKEW1
+
t
WFF
.Note,
if
t
SKEW1
is
violated
the
time
FF
HIGH
will
be:
t
SKEW1
+
WCLK
+
t
WFF
.
*F*
Word,
Wd-2
is
written
into
Qy.
*FF*
Word,
W2
is
read
from
Qy.
*G*
Word,
Wd-1
is
written
into
Qy.
*H*
Word,
Wd
is
written
into
Qy,
this
causes
Qy
to
go
full,
FF
goes
LOW.
*I*
No
writes
occur
to
Qy.
*J*
Qy
goes
“not
full”
based
on
reading
word
W1
from
Qy
on
cycle
*EE*.
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