IDT72P51759L6BBI8 IDT, Integrated Device Technology Inc, IDT72P51759L6BBI8 Datasheet - Page 9

• Manufacturer Part Number: IDT72P51759L6BBI8
• Description: IC FLOW CTRL 36BIT 256-BGA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT72P51759L6BBI8

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 72P51759L6BBI8

(bit 35) constituting the entire packet. A packet can be any length the user desires,
up to the total available memory in the multi-queue device. The device monitors
the SOP (bit 34) and looks for the word that contains the EOP (bit 35). The read
port is supplied with an additional status flag, “Packet Ready”. The Packet Ready
(PR) flag in conjunction with Empty Flag or Output Ready flag (EF/OR)
indicates when at least one packet is available to read. When in packet mode
the almost empty flag status , provides packet ready flag status for individual
queues.
EXPANSION (IDT STANDARD MODE)
a parallel fashion. Expansion achieves both depth or queue expansion.
Expansion of devices is supported only in IDT Standard mode. Depth
Expansion means expanding the depths of individual queues. Queue expan-
sion means increasing the total number of queues available. Depth expansion
IDT72P51749/72P51759/72P51769 1.8V, MULTI-QUEUE FLOW-CONTROL DEVICES
(128 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648, 2,359,296, and 4,718,592
bits
Expansion of multi-queue devices is possible, by connecting the devices in
9
is possible by virtue of the fact that more memory blocks within a multi-queue
device can be allocated to a fewer number of queues to increase the depth of
each queue. For example, depth expansion of 2 devices provides the possibility
of 2 queues of 4096K bits, each queue being setup within a single device utilizing
all memory blocks available to produce a single queue. This is the deepest
queue that can setup within a device.
may be setup. If fewer queues are desired, then more memory blocks will be
available to increase queue depths if desired. When connecting multi-queue
devices in expansion configuration all respective input pins (data & control) and
output pins (data & flags), should be “connected” together between individual
devices. Refer to Figure 67, Connecting Two 4M MQ 128Q devices in
Expansion Mode, and Figure 68, Connecting Three or more 4M MQ 128Q
in Expansion mode using WRADD bit 7 / RDADD bit 7 for device connection
details.
For queue expansion a maximum number of 256 queues (2 x 128 queues)
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
FEBRUARY 10, 2009