参数资料
型号: IDT72V51246L6BB8
厂商: IDT, Integrated Device Technology Inc
文件页数: 31/56页
文件大小: 0K
描述: IC FLOW CTRL MULTI QUEUE 256-BGA
标准包装: 1,000
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: 带卷 (TR)
其它名称: 72V51246L6BB8
37
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 13. Output Valid Flag Timing (In Expansion Mode)
RCLK
RADEN
tQH
tQS
tAH
tAS
RDADD
D1 Q3
OV
(Device 1)
5937 drw16
tENS
REN
tAH
tAS
tQH
tQS
Qout
(Device 1)
tROV
HIGH-Z
WCLK
D1 Q2
OV
(Device 2)
tOVHZ
tSKEW1
tAH
tAS
WRADD
D1 Q2
tQH
tQS
WADEN
tDH
tDS
D1 Q2
W0
Din
tA
D1 Q3 WD Last Word
tOLZ
tA
D1 Q2
PFT We-1
tA
D1 Q2 We Last Word
tA
W0 Q2
D1
tOVLZ
tROV
WEN
tENS
tENH
*A*
*B*
*C*
*D*
*E*
*F*
*G*
*H*
*I*
Addr=001011
Addr=001010
Cycle:
*A* Queue 3 of Device 1 is selected for read operations. The
OV is currently being driven by Device 2, a queue within device 2 is selected for reads. Device 2 also has control
of Qout bus, its Qout outputs are in Low-Impedance. This diagram only shows the Qout outputs of device 1. (Reads are disabled).
*B* Reads are now enabled. A word from the previously selected queue of Device 2 will be read out.
*C* The Qout of Device 1 goes to Low-Impedance and word Wd is read from Q3 of D1. This happens to be the last word of Q3. Device 2 places its Qout outputs into
High-Impedance, device 1 has control of the Qout bus. The
OV flag of Device 2 goes to High-Impedance and Device 1 takes control of OV. The OV flag of Device 1 goes LOW
to show that Wd of Q3 is valid.
*D* Queue 2 of device 1 is selected for read operations. The last word of Q3 was read on the previous cycle, therefore
OV goes HIGH to indicate that the data on the Qout is
not valid (Q3 was read to empty). Word, Wd remains on the output bus.
*E* The last word of Q3 remains on the Qout bus,
OV is HIGH, indicating that this word has been previously read.
*F* The next word (We-1), available from the newly selected queue, Q2 of device 1 is now read out. This will occur regardless of
REN, 2 RCLK cycles after queue selection
due to the FWFT operation. The
OV flag now goes LOW to indicate that this word is valid.
*G* The last word, We is read from Q2, this queue is now empty.
*H* The
OV flag goes HIGH to indicate that Q2 was read to empty on the previous cycle.
*I* Due to a write operation the
OV flag goes LOW and data word W0 is read from Q2. The latency is: tSKEW1 + 1*RCLK + tROV.
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