IDT72P51777L7-5BBI IDT, Integrated Device Technology Inc, IDT72P51777L7-5BBI Datasheet - Page 75

• 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

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, WEN is HIGH.
*C* No write occurs, WEN is HIGH.
*D* No write occurs, WEN is HIGH.
*E* Word, Wd-m is written into Q5 causing the PAF flag to go from HIGH to LOW. The flag latency is 3 WCLK cycles + t
*F* Queue 9 in device 1 is now selected for write operations. This queue is not almost full, therefore the PAF flag will update after a 3 WCLK + t
*G* The PAF flag goes LOW based on the write 2 cycles earlier.
*H* No write occurs, WEN is HIGH.
*I* The PAF flag goes HIGH due to the queue switch to Q9.
NOTE:
1. The waveform shows the PAF flag operation when no queue switch occurs and a queue is selected on both the write and read ports is being written to then read
2. Flag Latencies:
3. If t
IDT72P51767/72P51777 1.8V, MULTI-QUEUE FLOW-CONTROL DEVICES
(128 QUEUES) 40 BIT WIDE CONFIGURATION 5,898,240 and 11,796,480 bits
WRADD
WADEN
PAF
(Device 1)
PAF
(Device 2)
WCLK
RCLK
WCLK
from at the almost full boundary.
Assertion: 2*WCLK + t
De-assertion: t
WEN
WEN
REN
PAF
Din
SKEW2
HIGH-Z
t
is violated there will be one extra WCLK cycle.
CLKL
t
AS
t
QS
SKEW2
D
*A*
1
Q
5
+ WCLK + t
t
QH
WAF
t
AH
t
ENS
WAF
*B*
D - (m+1) words in Queue
t
CLKL
t
ENH
*C*
Figure 53. Almost Full Flag Timing and Queue Switch
(
2)
*D*
Figure 54. Almost Full Flag Timing
t
FFHZ
t
AFLZ
t
ENS
t
DS
W
*E*
D-m
D
75
t
WAF
1
t
t
ENH
DH
Q
5
t
t
AS
QS
D
t
ENS
*F*
1
Q
1
9
t
QH
t
t
AH
SKEW2
*G*
2
t
ENH
D - m words in Queue
t
WAF
WAF
.
*H*
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
WAF
*I*
FEBRUARY 11, 2009
t
WAF
latency.
t
WAF
*J*
D-(m+1) words
in Queue
6724 drw67
6724 drw66