IDT72V51246L7-5BB IDT, Integrated Device Technology Inc, IDT72V51246L7-5BB Datasheet - Page 43

• Manufacturer Part Number: IDT72V51246L7-5BB
• Description: IC FLOW CTRL MULTI QUEUE 256-BGA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT72V51246L7-5BB

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 72V51246L7-5BB

NOTES:
1. The purpose of the Null queue operation is so that the user can stop reading a block (packet) of data from a queue without filling the 2 stage output pipeline with the next words
2. Please see Figure 21, Null Queue Flow Diagram.
Cycle:
*A* Null Q of device 0 is selected, when word Wn-1 from previously selected Q1 is read.
*B* REN is HIGH and Wn (Last Word of the Packet) of Q1 is pipelined onto the O/P register.
*C* The Null Q is seen as an empty Queue on the read side, therefore Wn of Q1 remains in the O/P register and OV goes HIGH.
*D* A new Q, Q3 is selected and the 1st word of Q3 will fall through present on the O/P register on cycle *F*.
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
Q1
Wn
Qn
Wn-1
RDADD
RADEN
from that queue.
RCLK
Note: *B* and *C* are a minimum 2 RCLK cycles between Q selects.
Qout
REN
O/P Reg.
Queue 1
Memory
OV
*A*
Q1 Wn-3
Q1
Wn
Q1
Wn
O/P Reg.
Queue
*B*
t
Null
A
t
t
QS
Q1 Wn-2
AS
NULL QUEUE
SELECT
0001xx
*A*
Figure 20. Read Operation and Null Queue Select
t
ENH
t
A
t
t
AH
Q1
Wn
QH
Q1
Wn
Figure 21. Null Queue Flow Diagram
Q1 Wn-1
O/P Reg.
Queue
*C*
Null
*B*
t
A
43
Q1
Wn
Q1
Wn
*C*
O/P Reg.
Queue
*D*
Null
t
ROV
t
t
AS
QS
NEW QUEUE
SELECT
000011
D
*D*
0
Q
Q1 Wn
3
t
Q1
Wn
t
Q3
W0
AH
QH
t
ENS
O/P Reg.
Queue 3
Memory
COMMERCIAL AND INDUSTRIAL
*E*
*E*
TEMPERATURE RANGES
t
ROV
Q3
W0
*F*
Q3
W1
O/P Reg.
Queue 3
Memory
t
*F*
A
5937 drw24
Q3 W0
FWFT
5937 drw23