參數(shù)資料
型號(hào)： IDT72T51553L5BBI
廠(chǎng)商： INTEGRATED DEVICE TECHNOLOGY INC
元件分類(lèi)： DRAM
英文描述： 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 18 BIT WIDE CONFIGURATION
中文描述： 128K X 18 OTHER FIFO, PBGA256
封裝： PLASTIC, BGA-256
文件頁(yè)數(shù)： 27/57頁(yè)
文件大?。?/td> 564K
代理商： IDT72T51553L5BBI
27
IDT72T51543/72T51553 2.5V, MULTI-QUEUE FLOW-CONTROL DEVICES
(32 QUEUES) 18 BIT WIDE CONFIGURATION 1,179,648 and 2,359,296 bits
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
the new quadrant selected 1 RCLK cycle after quadrant selection.
PAE
n[0:7]
gets status of queues, Queue[0:7] respectively.
To address the second quadrant, Queue[8:15], the RDADD address is
“xxxxxx01”.
PAE
n[0:7] gets status of queues, Queue[8:15] respectively. To
address the third quadrant, Queue[16:23], the RDADD address is “xxxxxx10”.
PAE
[0:7] gets status of queues, Queue[16:23] respectively. To address the
fourth quadrant, Queue[24:31], the RDADD address is “xxxxxx11”.
PAE
[0:1]
gets status of queues, Queue[24:25] respectively. Remember, only 26 queues
were setup, so when quadrant 4 is selected the unused outputs
PAE
[2:7] will
be don't care states.
Note, that if a read or write operation is occurring to a specific queue, say
queue x’ on the same cycle as a quadrant switch which will include the queue
‘x’, then there may be an extra RCLK cycle delay before that queues status is
correctly shown on the respective output of the
PAE
n bus.
Quadrants can be selected on consecutive clock cycles, that is the quadrant
on the
PAE
n bus can change every RCLK cycle. Also, data can be read out
of a queue on the same RCLK rising edge that a quadrant is being selected,
the only restriction being that a read queue selection and
PAE
n quadrant
selection cannot be made on the same RCLK cycle.
If 8 or less queues are setup then queues, Queue[0:7] have their
PAE
status
output on
PAE
[0:7] constantly.
When the multi-queue devices are connected in expansion of more than one
device the
PAE
n busses of all devices are connected together, when switching
between quadrants 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.
Please refer to Figure 24,
PAE
n - Direct Mode Quadrant Selection
for timng
information. Also refer to Table 2,
Read Address Bus, RDADD
.
PAE
n – POLLED BUS
If FMis HIGH at master reset then the
PAE
n bus operates in Polled (looped)
mode. In polled mode the
PAE
n bus automatically cycles through the 4
quadrants within the device regardless of how many queues have been setup
in the part. Every rising edge of the RCLK causes the next quadrant to be loaded
on the
PAE
n bus. The device configured as the master (MAST input tied HIGH),
will take control of the
PAE
n after
MRS
goes LOW. For the whole RCLK cycle
that the first quadrant is on
PAE
n the ESYNC (
PAE
n bus sync) output will be
HIGH, for all other quadrants, this ESYNC output will be LOW. This ESYNC
output provides the user with a mark with which they can synchronize to the
PAE
n bus, ESYNC is always HIGH for the RCLK cycle that the first quadrant
of a device is present on the
PAE
n bus.
When devices are connected in expansion mode, only one device will be
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
PAE
n bus and
will place its first quadrant 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
PAE
n bus and cycle its quadrants through it, all other devices hold
their
PAE
n outputs in High-Impedance. When the master device has cycled all
of its quadrants it passes a token to the next device in the chain and that device
assumes control of the
PAE
n bus and then cycles its quadrants and so on, the
PAE
n bus control token being passed on fromdevice 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
PAE
n bus has cycled
through all quadrants of all devices, control of the
PAE
n 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 quadrant on to the
PAE
n bus.
When operating in single device mode the EXI input must be connected to
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
PAE
n bus.
Please refer to Figure 29,
PAE
n Bus – Polled Mode
for timng information.
相關(guān)PDF資料
PDF描述
IDT72T51553L6BB 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 18 BIT WIDE CONFIGURATION
IDT72T51553L6BBI 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 18 BIT WIDE CONFIGURATION
IDT72T51546L5BBI 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
IDT72T51546L6BB 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
IDT72T51546L6BBI 2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
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