IDT72V51233L7-5BB8 IDT, Integrated Device Technology Inc, IDT72V51233L7-5BB8 Datasheet - Page 37

• Manufacturer Part Number: IDT72V51233L7-5BB8
• Description: IC FLOW CTRL MULTI QUEUE 256-BGA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT72V51233L7-5BB8

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 72V51233L7-5BB8

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 17, 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*.
IDT72V51233/72V51243/72V51253 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES
(4 QUEUES) 18 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits
Q1
Wn
Qn
Wn-1
RDADD
from that queue.
RADEN
Note: *B* and *C* are a minimum 2 RCLK cycles between Q selects.
RCLK
Qout
REN
O/P Reg.
Queue 1
Memory
OV
*A*
Q1 Wn-3
Q1
Wn
Q1
Wn
O/P Reg.
Queue
t
*B*
A
Null
t
t
QS
AS
Q1 Wn-2
NULL QUEUE
SELECT
0001xx
*A*
Figure 16. Read Operation and Null Queue Select
t
ENH
t
A
t
t
AH
QH
Q1
Wn
Q1
Wn
Q1 Wn-1
Figure 17. Null Queue Flow Diagram
O/P Reg.
Queue
*C*
Null
*B*
t
A
37
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
t
Q1
Wn
AH
Q3
W0
QH
t
ENS
Queue 3
Memory
O/P Reg.
*E*
COMMERCIAL AND INDUSTRIAL
*E*
TEMPERATURE RANGES
t
ROV
*F*
Q3
W0
Q3
W1
Queue 3
Memory
O/P Reg.
t
A
*F*
Q3 W0
5941 drw19
FWFT
5941 drw18