IDT72P51777L7-5BBI IDT, Integrated Device Technology Inc, IDT72P51777L7-5BBI Datasheet - Page 25

• 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

Queue End/Start Address
This is the 5th 26-bit word and represents both the start and end address of each queue.
End Address: The queue end address is bits [25:13] of the 26-bit. An end addresses is specified as; Queue Depth – 1k . Ending address are specified in
increments of 1K words. For example, for a Queue Depth of 16K, the first queue would have a starting address of 0, bits [12:0] = “0000000000000” and an
end address of 15K, bits [25:13] = “0000000001111”,
Start Address: The queue starting address is bits [12:0] of the 26-bit word. Start addresses are specified in increments of words. The first queue should always
start at address 0. The starting address of the next queue should be programmed at an address that is words greater the ending address of the previous queue.
PAE: This is the 3
that is programmed into the device is the number of words. For example, for a PAE value = 52 words, bits [19:0] = “00000000000000110100”.
PAF: This is the 4
that is programmed into the device is the “Queue Depth Value” – “The PAF Offset value”. For example, with a Queue Depth of 16K (16384) and a desired
PAF value = 39 words, bits [19:0] = “00000011111111011001”.
IDT72P51767/72P51777 1.8V, MULTI-QUEUE FLOW-CONTROL DEVICES
(128 QUEUES) 40 BIT WIDE CONFIGURATION 5,898,240 and 11,796,480 bits
Bits
Bits
Bits
Value 4096 2048 1024
Value
Value
Binary 0
Binary 0
25
25
25
24
24
0
0
24
rd
23 22
23 22
th
0
0
26-bit word and represents the Programmable Almost Empty (PAE) value. Each queue requires an individual PAE value. The PAE value
26-bit word and represents the Programmable Almost Full (PAF) value. Each queue requires an individual PAF value. The PAF value
23
0
0
21 20
21 20
512
0
0
22
0 524288 262144 131072 65536 32768 16384
0 524288 262144 131072 65536 32768 16384
End Address
256
21
19
19
128
20
18
18
19
64
18
32
17
17
17
16
16
16
16
8
15
4
15
15
14
2
13
25
14
14
1
4096 2048 1024
12
8192
8192
13
13
11
4096 2048 1024 512 256 128 64
4096 2048 1024 512 256 128 64
12
12
10
11
11
512
9
10
10
256
8
9
9
Start Address
128
8
8
7
COMMERCIAL AND INDUSTRIAL
7
7
64
6
6
6
TEMPERATURE RANGES
32
5
32 16
32 16
5
5
FEBRUARY 11, 2009
16
4
4
4
3
8
3
8
3
8
2
4
2
4
2
4
1
2
1
2
1
2
0
1
0
1
0
1