參數(shù)資料
型號: IDT72T51253L6BBI
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: DRAM
英文描述: 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
中文描述: 128K X 18 OTHER FIFO, 3.7 ns, PBGA256
封裝: 17 X 17 MM, 1 MM PITCH, PLASTIC, BGA-256
文件頁數(shù): 42/55頁
文件大?。?/td> 544K
代理商: IDT72T51253L6BBI
42
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
IDT72T51233/72T51243/72T51253 2.5V, MULTI-QUEUE FLOW-CONTROL DEVICES
(4 QUEUES) 18 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits
Figure 21. Almost Empty Flag Timing and Queue Switch
Figure 22. 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
6115 drw25
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
6115 drw26
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.
相關PDF資料
PDF描述
IDT72T51253L5BBI 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
IDT72T51253L6BB 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
IDT72T51233 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
IDT72T51233L5BB 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
IDT72T51233L5BBI 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
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