IDT72V51556L7-5BB8 IDT, Integrated Device Technology Inc, IDT72V51556L7-5BB8 Datasheet - Page 45

• Manufacturer Part Number: IDT72V51556L7-5BB8
• Description: IC FLOW CTRL MULTI QUEUE 256-BGA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT72V51556L7-5BB8

• Configuration: Dual
• Density: 2Mb
• Access Time (max): 4ns
• Word Size: 36b
• Sync/async: Synchronous
• Expandable: Yes
• Bus Direction: Uni-Directional
• Package Type: BGA
• Clock Freq (max): 133MHz
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.15V
• Operating Supply Voltage (max): 3.6V
• Supply Current: 100mA
• 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: 72V51556L7-5BB8

Cycle:
*A* Queue 5 of Device 1 is selected on the write port. A queue within Device 2 had previously been selected. The PAF output of device 1 is High-Impedance.
*B* No write occurs.
*C* Word, Wd-m is written into Q5 causing the PAF flag to go from HIGH to LOW. The flag latency is 2 WCLK cycles + t
*D* Queue 9 if device 1 is now selected for write operations. This queue is not almost full, therefore the PAF flag will update after a 2 WCLK + t
*E* The PAF flag goes LOW based on the write 2 cycles earlier.
*F* The PAF flag goes HIGH due to the queue switch to Q9.
NOTE:
1. The waveform here shows the PAF flag operation when no queue switches are occurring and a queue selected on both the write and read ports is being written to then read
IDT72V51546/72V51556 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES
(32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 and 2,359,296 bits
WRADD
WADEN
WCLK
PAF
(Device 1)
PAF
(Device 2)
WEN
RCLK
from at the almost full boundary.
Flag Latencies:
Assertion: 2*WCLK + t
De-assertion: t
If t
PAF
WCLK
REN
WEN
SKEW2
Din
t
is violated there will be one extra WCLK cycle.
CLKL
SKEW2
HIGH-Z
t
AS
t
QS
+ WCLK + t
WAF
D
t
ENS
1
*A*
Q
5
WAF
t
QH
t
AH
D - (m+1) words in Queue
t
CLKL
t
ENH
*B*
Figure 22. Almost Full Flag Timing and Queue Switch
1
D
t
1
ENS
Figure 23. Almost Full Flag Timing
Q
t
DS
5
W
*C*
D-m
2
t
t
t
FFHZ
DH
ENH
t
45
t
WAF
AFLZ
t
t
AS
QS
t
D
ENS
*D*
1
Q
1
9
t
SKEW2
t
QH
t
AH
t
ENH
D - m words in Queue
WAF
*E*
.
2
COMMERCIAL AND INDUSTRIAL
t
WAF
TEMPERATURE RANGES
WAF
1
*F*
t
latency.
WAF
t
WAF
D-(m+1) words
in Queue
5904 drw26
5904 drw25