IDT72P51749L5BB8 IDT, Integrated Device Technology Inc, IDT72P51749L5BB8 Datasheet - Page 30

• Manufacturer Part Number: IDT72P51749L5BB8
• Description: IC FLOW CTRL 36BIT 256-BGA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT72P51749L5BB8

• Configuration: Dual
• Density: 1.125Mb
• Access Time (max): 3.6ns
• Word Size: 36b
• Sync/async: Synchronous
• Expandable: Yes
• Bus Direction: Uni-Directional
• Package Type: BGA
• Clock Freq (max): 200MHz
• Supply Current: 150mA
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 256
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 72P51749L5BB8

supports writing and reading from either the same queue of from different
queues. The device also supports simultaneous queue switching on the write
on the write port. Refer to Table 6, Write Queue Switch Operation for a detailed
description of each queue switch clock cycle.
IDT72P51749/72P51759/72P51769 1.8V, MULTI-QUEUE FLOW-CONTROL DEVICES
(128 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648, 2,359,296, and 4,718,592 bits
The IDT 72P51749/72P51759/72P51769 multi-queue flow-control device
The multi-queue flow-control device requires 4 clock cycles to switch queues
WADEN
RADEN
WCLK
RCLK
WEN
Qout
REN
Din
TABLE 6 — WRITE QUEUE SWITCH OPERATION
Queue Switch
QS-1
QS0
QS1
QS2
QS3
Cycle
PQ
PQ
Queue Switch Initiated, Rewrite/No Rewrite selection
Queue MARK / Un-MARK
—
•
•
•
Start of Write Data Operation
PAF signal updated for Next Queue (NQ)
Packet Ready (PR) signal updated
Full Flag (FF) updated for NQ
PQ
PQ
PQ
PQ
Figure 9. Simultaneous Queue Switching
IDT Mode
PQ
PQ
PQ
PQ
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and read ports. The simultaneous queue switching may occur with either the
Write Clock and Read Clock synchronous or asynchronous to each other. For
reference refer to Figure 9, Simultaneous Queue Switching.
NQ
NQ
Queue Switch Initiated, Rewrite/No Rewrite selection
Queue MARK / Un-MARK
—
•
•
•
Start of Write Data Operation
PAF signal updated for Next Queue (NQ)
Packet Ready (PR) signal updated
IR flag updated for NQ
FWFT Mode
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
SEPTEMBER 27, 2004
6714 drw15