IDT72V51446L7-5BB IDT, Integrated Device Technology Inc, IDT72V51446L7-5BB Datasheet - Page 28

• Manufacturer Part Number: IDT72V51446L7-5BB
• Description: IC FLOW CTRL MULTI QUEUE 256-BGA
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT72V51446L7-5BB

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 72V51446L7-5BB

switching between sectors of different devices the user must utilize the 3 most
significant bits of the RDADD address bus (as well as the 2 LSb’s). These 3 MSb’s
correspond to the device ID inputs, which are the static inputs, ID0, ID1 & ID2.
timing information. Also refer to Table 2, Read Address Bus, RDADD.
PAEn – POLLED BUS
(looped) mode. In polled mode the PAEn/PRn bus automatically cycles through
the 2 sectors within the device regardless of how many queues have been setup
in the part. Every rising edge of the RCLK causes the next sector to be loaded
on the PAEn/PRn bus. The device configured as the master (MAST input tied
HIGH), will take control of the PAEn/PRn after MRS goes LOW. For the whole
RCLK cycle that the first sector is on PAEn/PRn the ESYNC (PAEn/PRn bus
sync) output will be HIGH, for the 2nd sector, this ESYNC output will be LOW.
This ESYNC output provides the user with a mark with which they can
synchronize to the PAEn/PRn bus, ESYNC is always HIGH for the RCLK cycle
that the first sector of a device is present on the PAEn/PRn bus.
set as the Master, MAST input tied HIGH, all other devices will have MAST tied
LOW. The master device is the first device to take control of the PAEn/PRn bus
IDT72V51436/72V51446/72V51456 3.3V, MULTI-QUEUE FLOW-CONTROL DEVICES
(16 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits
Please refer to Figure 26, PAE n/ PR n - Direct Mode Sector Selection for
If FM is HIGH at master reset then the PAEn/PRn bus operates in Polled
When devices are connected in expansion mode, only one device will be
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and will place its first sector on the bus on the rising edge of RCLK after the MRS
input goes LOW. For the next 3 RCLK cycles the master device will maintain
control of the PAEn/PRn bus and cycle its sectors through it, all other devices
hold their PAEn/PRn outputs in High-Impedance. When the master device has
cycled its sectors it passes a token to the next device in the chain and that device
assumes control of the PAEn/PRn bus and then cycles its sectors and so on,
the PAEn/PRn bus control token being passed on from device to device. This
token passing is done via the EXO outputs and EXI inputs of the devices (“PAE
Expansion Out” and “PAE Expansion In”). The EXO output of the master device
connects to the EXI of the second device in the chain and the EXO of the second
connects to the EXI of the third and so on. The final device in a chain has its EXO
connected to the EXI of the first device, so that once the PAEn/PRn bus has cycled
through all sectors of all devices, control of the PAEn/PRn will pass to the master
device again and so on. The ESYNC of each respective device will operate
independently and simply indicate when that respective device has taken control
of the bus and is placing its first sector on to the PAEn/PRn bus.
the EXO output of the same device. In single device mode a token is still required
to be passed into the device for accessing the PAEn bus.
information.
When operating in single device mode the EXI input must be connected to
Please refer to Figure 31, PAE n/ PR n Bus – Polled Mode for timing
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES