IDT72P51777L7-5BBI IDT, Integrated Device Technology Inc, IDT72P51777L7-5BBI Datasheet - Page 45

• Manufacturer Part Number: IDT72P51777L7-5BBI
• Description: IC FLOW CTRL 40BIT 376-BGA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT72P51777L7-5BBI

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 72P51777L7-5BBI

SIMULTANEOUS QUEUE SWITCHING
reading and writing from either the same queue or from different queues. The
device also supports simultaneous queue switching on the read and write ports.
The simultaneous queue switching may occur with either the Read Clock and
IDT72P51767/72P51777 1.8V, MULTI-QUEUE FLOW-CONTROL DEVICES
(128 QUEUES) 40 BIT WIDE CONFIGURATION 5,898,240 and 11,796,480 bits
The IDT72P51767/72P51777 multi-queue flow-control device supports
WADEN
RADEN
TABLE 13 — SAME QUEUE SWITCH
TABLE 12 — READ QUEUE SWITCH OPERATION
WCLK
RCLK
Queue Switch
WEN
Qout
REN
Din
Not Marked
Not Marked
QS-1
QS0
QS1
QS2
QS3
Cycle
Marked
Marked
Marked
Marked
PQ
PQ
Queue Switch Initiated, Re-read/No Re-read selection
Queue MARK / Un-MARK
—
•
•
Start of Read Data Operation
PAE signal updated for Next Queue (NQ)
Empty Flag (EF) updated for NQ
PQ
PQ
Not Marked, No Reread
Not Marked, Reread
Marked, No Reread
Marked, Reread
Not Marked
Marked
NQ
PQ
PQ
Figure 23. Simultaneous Queue Switching
IDT Mode
PQ
PQ
Supported
Not Allowed
Not Allowed
PQ
PQ
Yes
Yes
Yes
Yes
45
Write Clock synchronous or asynchronous to each other. For reference refer
to Figure 23, Simultaneous Queue Switching.
on the read port, refer to Table 12, Read Queue Switch Operation for a detailed
description of each queue switch clock cycles.
The multi-queue flow-control device requires 4 clock cycles to switch queues
NQ
PQ
Add Mark to current queue
Queue Switch is ignored
NQ
Remove Mark
Keep Mark
Comment
COMMERCIAL AND INDUSTRIAL
Legend:
PQ = Present Queue
NQ = Next Queue
TEMPERATURE RANGES
FEBRUARY 11, 2009
6724 drw18