IDT72P51369L6BBI8 IDT, Integrated Device Technology Inc, IDT72P51369L6BBI8 Datasheet - Page 29

• Manufacturer Part Number: IDT72P51369L6BBI8
• Description: IC FLOW CTRL 36BIT 256-BGA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT72P51369L6BBI8

• Configuration: Dual
• Density: 4.5Mb
• Access Time (max): 3.7ns
• Word Size: 36b
• Sync/async: Synchronous
• Expandable: Yes
• Bus Direction: Uni-Directional
• Package Type: BGA
• Clock Freq (max): 166MHz
• Supply Current: 150mA
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 256
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 72P51369L6BBI8

SWITCHING QUEUES ON THE WRITE PORT
trol devices can be configured up to a maximum of 8 queues. Data is written into
a queue using the Data Input (Din) bus, Write Clock (WCLK) and Write Enable
(WEN) signals. Selecting a queue occurs by placing the queue address on the
trol device supports changing (switching) queues every four (4) clock cycles.
To switch from the Present Queue (PQ) to another queue requires a queue
address to be placed on the Write Address Bus (WRADD) bus and a rising edge
of Write Clock (WCLK) and Write Address Enable (WADEN) is HIGH. There
are no restrictions as to the order to which queues are selected or switched into
or out of.
NOTES:
1. PQ = Present Queue
* Requires 4 clock cycles to switch queues.
IDT72P51339/72P51349/72P51359/72P51369 1.8V, MQ FLOW-CONTROL DEVICES
(8 QUEUES) 36 BIT WIDE CONFIGURATION 589, 824, 1,179,648, 2,359,296, and 4,718,592
The IDT72P51339/72P51349/72P51359/72P51369 multi-queue flow-con-
The IDT72P51339/72P51349/72P51359/72P51369 multi-queue flow-con-
NQ = Next Queue
WADEN
WCLK
WEN
Din
WRADD
WADEN
WCLK
PQ
Queue
address
Figure 7. Write Port Switching Queues Signal Sequence
QS-1
Queue Switch Cycles *
PQ
Figure 8. Switching Queues Bus Efficiency
Queue Switch Cycle
QS0
PQ
QS1
PQ
29
Write Address bus (WRADD) during a rising edge of WCLK while Write Address
Enable (WADEN) is HIGH. For reference, the state of Write Enable (WEN) is
a “Don’t Care” during a queue selection. WEN has significance during the queue
mark operation. Selecting a queue requires 4 WCLK cycles. Refer to Figure
7, Write Port Switching Queues Signal Sequence.
the IDT72P51339/72P51349/72P51359/72P51369 multi-queue flow-control
device can continue to write into the Present Queue (PQ). The Present Queue
is defined as the current selected queue. Refer to Figure 8, Switching Queues
Bus Efficiency.
QS2
For maximum efficiency, during the 4 clock cycles required to switch queues
NQ
Queue
address
QS3
NQ
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
6716 drw13
AUGUST 4, 2005
6716 drw14