IDT72P51749L5BB8 IDT, Integrated Device Technology Inc, IDT72P51749L5BB8 Datasheet - Page 25

• Manufacturer Part Number: IDT72P51749L5BB8
• Description: IC FLOW CTRL 36BIT 256-BGA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT72P51749L5BB8

• Configuration: Dual
• Density: 1.125Mb
• Access Time (max): 3.6ns
• Word Size: 36b
• Sync/async: Synchronous
• Expandable: Yes
• Bus Direction: Uni-Directional
• Package Type: BGA
• Clock Freq (max): 200MHz
• Supply Current: 150mA
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 256
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 72P51749L5BB8

QUEUE DESCRIPTION
CONFIGURATION OF THE IDT MULTI-QUEUE FLOW-CONTROL DEVICE
can be configured in distinct modes, namely Packet mode, FIFO mode, Standard
flag (EF) signaling. EF is an active LOW signal. When EF is LOW it signifies the
selected (present) queue is empty. On the write port, signal FF/IR is configured
for full flag (FF) signaling. FF is an active LOW signal. When FF is LOW it signifies
the selected (present) queue is full. Refer to Figure 5, IDT Standard mode
illustrated (Read Port).
signaling. OR is an active LOW signal. When OR is HIGH, it signifies there is no
available word to read. On the write port, signal FF/IR is configured for input
ready (IR) signaling. IR is an active LOW signal. When IR is LOW it signifies the
write port is ready for writing into the selected queue. Refer to Figure 6, FWFT
mode illustrated (Read Port).
IDT Standard
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
The IDT72P51749/72P51759/72P51769 multi-queue flow-control devices
In IDT Standard mode the read port signal EF/OR is configured for empty
In FWFT mode the read port signal EF/OR is configured for output ready (OR)
Mode
Packet Mode
Data Bus
RCLK
Qout
REN
FWFT Mode
RCLK
EF
Qout
REN
Operational Modes
OR
All available words have been
read, the Queue is empty
Figure 6. First Word Fall Through (FWFT) mode illustrated (Read Port)
IDT Standard
Previous word
Mode
Figure 5. IDT Standard mode illustrated (Read Port)
FIFO Mode
FWFT Mode
The Queue has no available words for reading
25
mode, and FWFT mode. To configure the device operational mode set the
configuration pins (PKT, FWFT) as indicated in Table 3, Mode Configuration.
TABLE 3 — MODE CONFIGURATION
Configuration Signals
PKT
LOW
LOW
HIGH
HIGH
A word is available for reading
FWFT
LOW
HIGH
LOW
HIGH
FIFO mode - IDT Standard Mode
FIFO mode - FWFT
Packet mode - IDT Standard Mode
Packet mode - FWFT
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
Modes
SEPTEMBER 27, 2004
6714 drw09
6714 drw10