參數資料
型號: IDT72T51256L5BBI
廠商: Integrated Device Technology, Inc.
英文描述: 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (4 QUEUES) 36 BIT WIDE CONFIGURATION 589,824 bits, 1,179,648 bits and 2,359,296 bits
中文描述: 2.5V的多隊列流量控制器件(4個隊列)36位寬度的配置589,824位,1179648和2359296位位
文件頁數: 49/62頁
文件大小: 622K
代理商: IDT72T51256L5BBI
49
IDT72T51236/72T51246/72T51256 2.5V, MULTI-QUEUE FLOW-CONTROL DEVICES
(4 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
Figure 25. Almost Empty Flag Timing and Queue Switch
Figure 26. Almost Empty Flag Timing
RCLK
RADEN
t
QH
t
QS
t
AH
t
AS
RDADD
D
1
Q
3
t
AH
t
AS
D
1
Q
1
PAE
(Device 1)
t
AELZ
6116 drw30
t
OLZ
t
RAE
t
RAE
t
AEHZ
t
A
D
1
Q
3
W
n
t
A
D
1
Q
3
W
n+1
t
A
D
1
Q
1
W
0
t
A
D
1
Q
1
W
1
REN
t
QH
t
QS
Qout
HIGH-Z
PAE
(Device 2)
HIGH
HIGH-Z
HIGH-Z
*B*
*C*
*E*
*F*
*D*
*A*
*G*
*H*
Addr=00111
Addr=00101
WCLK
t
ENH
t
CLKH
t
CLKL
WEN
PAE
RCLK
t
ENS
n+1 words in Queue
t
RAE
t
SKEW2
t
RAE
1
2
REN
6116 drw31
t
ENS
t
ENH
n+2 words in Queue
n+1 words in Queue
Cycle:
*A*
Queue 3 of Device 1 is selected on the read port. A queue within Device 2 had previously been selected. The
PAE
flag output and the data outputs of device 1 are High-Impedance.
*B*
No read occurs.
*C*
No read occurs.
*D*
The
PAE
flag output now switches to device 1. Word, Wn is read fromQ3 due to the FWFT operation. This read operation fromQ3 is at the almost empty boundary, therefore
PAE
will go LOW 2 RCLK cycles later.
*E*
Q1 of device 1 is selected.
*F*
The
PAE
flag goes LOW due to the read fromQ3 2 RCLK cycles earlier. Word Wn+1 is read out due to the FWFT operation.
*G*
Word, W0 is read fromQ1 due to the FWFT operation.
*H*
The
PAE
flag goes HIGH to show that Q1 is not almost empty.
NOTE:
1. The waveformhere shows the
PAE
flag operation when no queue switches are occurring and a queue selected on both the write and read ports is being written to then read
fromat the almost empty boundary.
Flag Latencies:
Assertion: 2*RCLK + t
RAE
De-assertion: t
SKEW2
+ RCLK + t
RAE
If t
SKEW2
is violated there will be one extra RCLK cycle.
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