IDT72T51336 ETC-unknow, IDT72T51336 Datasheet - Page 51

• Manufacturer Part Number: IDT72T51336
• Description: 2.5v Multi-queue Flow-control Devices 8 Queues 36 Bit Wide Configuration 589,824 Bits, 1,179,648 Bits And 2,359,296 Bits
• Manufacturer: ETC-unknow

Cycle:
*A*
*AA* Device 0 is selected for the PAFn bus. The bus is currently providing status of a previously selected quadrant, Quad Y of device X.
*B*
*BB* Queue 1 of device 0 is selected on the write port.
*C*
*CC* The PAFn bus is updated with the quadrant selected on the previous cycle, Device 0 PAF[1] is LOW showing the status of queue 1.
*D*
*DD* No write operation.
*E*
*EE* PAF[1] goes HIGH to show that D0 Q1 is not almost empty due to the read on cycle *C*.
*F*
*FF* Word, Wy+1 is written into D0 Q1.
*G*
*GG* PAF[1] and the discrete PAF flag go LOW to show the write on cycle *DD* causes Q1 of D0 to again go almost full.
*H*
*I*
IDT72T51336/72T51346/72T51356 2.5V, MULTI-QUEUE FLOW-CONTROL DEVICES
(8 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits
Device 0
Bus
Q1 of device 0 is selected for read operations.
The last word in the output register is available on Qout. OE was previously taken LOW so the output bus is in Low-Impedance.
No read operation.
Word, Wx+1 is read out from the previous queue due to the FWFT effect.
The PAFn outputs of the device previously selected on the PAFn bus go to High-Impedance.
Device 7 is selected for the PAFn bus.
Word, Wd-m+1 is read from Q1 D0 due to the FWFT operation. This read is at the PAFn boundary of queue D0 Q1. This read will cause the PAF[1] output to go from
LOW to HIGH (almost full to not almost full), after a delay t
No read operations occur, REN is HIGH.
The active queue PAF flag of device 0 goes from High-Impedance to Low-Impedance.
Word, Wy is written into D0 Q1.
Queue 2 of Device 6 is selected for read operations.
Word, Wd-m+2 is read out due to FWFT operation.
Word, Wy+2 is written into D0 Q1.
No read operation.
Word, W0 is read from Q6 of D2, selected on cycle *F*, due to FWFT.
Device 0
WRADD
WADEN
RDADD
RADEN
WCLK
RCLK
ESTR
FSTR
PAFn
PAFn
PAFn
WEN
Prev.
Qout
REN
PAF
Din
OE
t
D
D
QS
t
AS
t
t
X
X
STS
AS
Quad y
Quad y
000 001
D0Q1
Device 0
t
*A*
OLZ
*AA*
000 xxx
t
t
t
AH
STH
t
QH
AH
t
QS
Prev. Q
t
AS
W
*B*
HIGH - Z
D0 Q1
X
*BB*
t
t
AH
QH
Figure 29. PAF n - Direct Mode, Flag Operation
HIGH-Z
*C*
SKEW3
*CC*
t
A
t
1
SKEW3
t
+ WCLK + tPAF. If t
STS
t
t
AS
PAFHZ
t
PAFLZ
Prev. Q
W
111 xxx
X +1
Device 7
Device 0
Device 0
*D*
*DD*
t
A
51
t
t
AH
2
STH
xxxxxx0x
xxxxxx0x
SKEW3
t
ENS
*E*
t
DS
is violated add an extra WCLK cycle.
Word W
D0 Q1
*EE*
t
QS
3
t
t
AS
DH
D0 Q1
W
y
t
t
PAF
D-M+1
PAFLZ
110 010
D6Q2
*F*
t
DS
D0 Q1
*FF*
W
t
QH
t
Device 0
Device 0
AH
y+1
HIGH-Z
t
DH
*G*
t
COMMERCIAL AND INDUSTRIAL
DS
t
A
D0 Q1
*GG*
W
y+2
t
DH
t
ENH
t
TEMPERATURE RANGES
t
PAF
WAF
*H*
W
D0 Q1
D - M + 2
Device 0
Device 0
*I*
t
A
D6 Q2
6114 drw34
W
0