IDT72P51777L7-5BBI IDT, Integrated Device Technology Inc, IDT72P51777L7-5BBI Datasheet - Page 33

• 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

READ QUEUE SELECTION AND READ OPERATION
(STANDARD MODE)
configured up to a maximum of 128 queues which data can be read via a common
read port using the data outputs (Qout), read clock (RCLK) and read enable
(REN). An output enable, OE control pin is also provided to allow High-
Impedance selection of the Qout data outputs. The multi-queue device read port
operates in standard IDT mode or BOI mode. The queue to be read is selected
by the address presented on the read address bus (RDADD) during a rising
edge on RCLK while read address enable (RADEN) is HIGH. The state of REN
does not impact the queue selection. The queue selection requires 4 RCLK
cycles. All subsequent data reads will be from this queue until another queue
is selected.
TABLE 9 — READ ADDRESS BUS, RDADD[7:0]
IDT72P51767/72P51777 1.8V, MULTI-QUEUE FLOW-CONTROL DEVICES
(128 QUEUES) 40 BIT WIDE CONFIGURATION 5,898,240 and 11,796,480 bits
The IDT72P51767/72P51777 multi-queue flow-control devices can be
Read Queue
Quadrant
Operation RCLK
Select
Select
PAEn
RADEN
1
0
Status Word
Address
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
ESTR
0
1
33
device. The read port is designed such that 100% bus utilization can be
obtained. This means that data can be read out of the device on every RCLK
rising edge including the cycle that a new queue is being addressed.
(see Figure 46, SDR Read Queue Select, Read Operation). RADEN goes
high signaling a change of queue (clock cycle “D”). The address on RDADD
at that time determines the next queue. Data presented during that cycle will be
read. Reading data can continue from the active queue, provided REN is LOW.
If REN is HIGH (inactive), data will not be read from the queue. If a new selected
queue is empty, reads from that queue will be prevented. Data cannot be read
from an empty queue. Remember that OE allows the user to place the data output
bus (Qout) into High-Impedance and the data can be read in to the output register
regardless of OE.
Queue Status on PAEn Bus
Q0 : Q7 → PAF0 : PAF7
Q8 : Q15 → PAF0 : PAF7
Q16 : Q23 → PAF0 : PAF7
Q24 : Q31 → PAF0 : PAF7
Q32 : Q39 → PAF0 : PAF7
Q40 : Q47 → PAF0 : PAF7
Q48 : Q55 → PAF0 : PAF7
Q56 : Q63 → PAF0 : PAF7
Q64 : Q71 → PAF0 : PAF7
Q72 : Q79 → PAF0 : PAF7
Q80 : Q87 → PAF0 : PAF7
Q88 : Q95 → PAF0 : PAF7
Q96 : Q103 → PAF0 : PAF7
Q104 : Q111 → PAF0 : PAF7
Q112 : Q119 → PAF0 : PAF7
Q120 : Q127 → PAF0 : PAF7
Standard mode operation is defined as individual words will be read from the
Changing queues requires a minimum of four RCLK cycles on the read port
Refer to Table 9, for Read Address Bus arrangement.
Device Select
(Compared to
ID2,1,0)
Device Select
(Compared to
ID2,1,0)
7 6 5
7 6 5
RDADD[7:0]
Read Queue Address
(6 bits = 64 Queues
7 bits = 128 Queues)
4 3 2
4
X
3 2 1 0
Status Word
Address
1 0
6724 drw12
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
FEBRUARY 11, 2009