IDT72P51359L6BB8 IDT, Integrated Device Technology Inc, IDT72P51359L6BB8 Datasheet - Page 32

• Manufacturer Part Number: IDT72P51359L6BB8
• Description: IC FLOW CTRL 36BIT 256-BGA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT72P51359L6BB8

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 72P51359L6BB8

SIMULTANEOUS QUEUE SWITCHING
trol device supports reading and writing from either the same queue of from
different queues. The device also supports simultaneous queue switching on
on the read port, refer to Table 7, Read Queue Switch Operation for a detailed
description of each queue switch clock cycles.
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 multi-queue flow-control device requires 4 clock cycles to switch queues
WADEN
RADEN
TABLE 8 — SAME QUEUE SWITCH
TABLE 7 — 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 Switch Initiated, Re-read/No Re-read selection
Queue MARK / Un-MARK
•
•
•
Start of Read Data Operation
PAE signal updated for Next Queue (NQ)
Packet Ready (PR) signal updated
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 12. Simultaneous Queue Switching
IDT Mode
—
PQ
PQ
Supported
Not Allowed
Not Allowed
PQ
PQ
Yes
Yes
Yes
Yes
32
the read and write ports. The simultaneous queue switching may occur with
either the Read Clock and Write Clock synchronous or asynchronous to each
other. For reference refer to Figure 12, Simultaneous Queue Switching.
NQ
PQ
Queue MARK / Un-MARK
•
•
•
•
PAE signal updated for Next Queue (NQ)
Packet Ready (PR) signal updated
Start of Read Data Operation
OR updated for NQ
Add Mark to current queue
Queue Switch is ignored
NQ
Remove Mark
Keep Mark
Comment
FWFT Mode
—
COMMERCIAL AND INDUSTRIAL
Legend:
PQ = Present Queue
NQ = Next Queue
TEMPERATURE RANGES
AUGUST 4, 2005
6716 drw18