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參數(shù)資料

型號：	IDT72T51236L5BBI
廠商：	Integrated Device Technology, Inc.
英文描述：	2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (4 QUEUES) 36 BIT WIDE CONFIGURATION 589,824 bits, 1,179,648 bits and 2,359,296 bits
中文描述：	2.5V的多隊(duì)列流量控制器件（4個隊(duì)列）36位寬度的配置589,824位，1179648和2359296位位
文件頁數(shù)：	25/62頁
文件大?。?/td>	622K
代理商：	IDT72T51236L5BBI

IDT72T51236/72T51246/72T51256 2.5V, MULTI-QUEUE FLOW-CONTROL DEVICES

(4 QUEUES) 36 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

newly selected queue. On the third rising edge of WCLK following the queue

selection, data can be written into the newly selected queue provided that data

and enable setup & hold times are met.

Note, the

flag will provide status of a newly selected queue two WCLK cycle

after queue selection, which is one cycle before data can be written to that queue.

This prevents the user fromwriting data to a queue that is full, (assumng that

a queue switch has been made to a queue that is actually full).

The

flag is synchronous to the WCLK and all transitions of the

flag occur

based on a rising edge of WCLK. Internally the multi-queue device monitors and

keeps a record of the full status for all queues. It is possible that the status of a

flag maybe changing internally even though that flag is not the active queue

flag (selected on the write port). A queue selected on the read port may

experience a change of its internal full flag status based on read operations.

See Figure 10,

Write Queue Select, Write Operation and Full Flag

Operation in Single Device Mode

and Figure 12,

Full Flag Timng in Expansion

Mode

for timng information.

EXPANSION MODE - FULL FLAG OPERATION

When multi-queue devices are connected in Expansion mode the

flags

of all devices should be connected together, such that a systemcontroller

monitoring and managing the multi-queue devices write port only looks at a

single

flag (as opposed to a discrete

flag for each device). This

flag

is only pertinent to the queue being selected for write operations at that time.

Remember, that when in expansion mode only one multi-queue device can be

written to at any moment in time, thus the

flag provides status of the active

queue on the write port.

This connection of flag outputs to create a single flag requires that the

flag

output have a High-Impedance capability, such that when a queue selection is

made only a single device drives the

flag bus and all other

flag outputs

connected to the

flag bus are placed into High-Impedance. The user does

not have to select this High-Impedance state, a given multi-queue flow-control

device will automatically place its

flag output into High-Impedance when none

of its queues are selected for write operations.

When queues within a single device are selected for write operations, the

flag output of that device will maintain control of the

flag bus. Its

flag will

simply update between queue switches to show the respective queue full status.

The multi-queue device places its

flag output into High-Impedance based

on the 3 bit ID code found in the 3 most significant bits of the write queue address

bus, WRADD. If the 3 most significant bits of WRADD match the 3 bit ID code setup

on the static inputs, ID0, ID1 and ID2 then the

flag output of the respective

device will be in a Low-Impedance state. If they do not match, then the

flag

output of the respective device will be in a High-Impedance state. See Figure

12,

Full Flag Timng in Expansion Mode

for details of flag operation, including

when more than one device is connected in expansion.

OUTPUT VALID FLAG OPERATION

The multi-queue flow-control device provides a single Output Valid flag

output,

. The

provides an empty status or data output valid status for the

data word currently available on the output register of the read port. The rising

edge of an RCLK cycle that places new data onto the output register of the read

port, also updates the

flag to show whether or not that new data word is

actually valid. Internally the multi-queue flow-control device monitors and

maintains a status of the empty condition of all queues within it, however only

the queue that is selected for read operations has its output valid (empty) status

output to the

flag, giving a valid status for the word being read at that time.

The nature of the first word fall through operation means that when the last

data word is read froma selected queue, the

flag will go HIGH on the next

enabled read, that is, on the next rising edge of RCLK while

REN

is LOW.

When queue switches are being made on the read port, the

flag will switch

to show status of the new queue in line with the data output fromthe new queue.

When a queue selection is made the first data fromthat queue will appear on

the Qout data outputs 3 RCLK cycles later, the

will change state to indicate

validity of the data fromthe newly selected queue on this 3

RCLK cycle also.

The previous cycles will continue to output data fromthe previous queue and

the

flag will indicate the status of those outputs. Again, the

flag always

indicates status for the data currently present on the output register.

The

flag is synchronous to the RCLK and all transitions of the

flag occur

based on a rising edge of RCLK. Internally the multi-queue device monitors and

keeps a record of the output valid (empty) status for all queues. It is possible that

the status of an

flag may be changing internally even though that respective

flag is not the active queue flag (selected on the read port). A queue selected

on the write port may experience a change of its internal

flag status based

on write operations, that is, data may be written into that queue causing it to

become “not empty”.

See Figure 13,

Read Queue Select, Read Operation in Single Device Mode

and Figure 14,

Output Valid Flag Timng

for details of the timng.

EXPANSION MODE – OUTPUT VALID FLAG OPERATION

When multi-queue devices are connected in Expansion mode, the

flags

of all devices should be connected together, such that a systemcontroller

monitoring and managing the multi-queue devices read port only looks at a

single

flag (as opposed to a discrete

flag for each device). This

flag

is only pertinent to the queue being selected for read operations at that time.

Remember, that when in expansion mode only one multi-queue device can be

read fromat any moment in time, thus the

flag provides status of the active

queue on the read port.

This connection of flag outputs to create a single flag requires that the

flag

output have a High-Impedance capability, such that when a queue selection is

made only a single device drives the

flag bus and all other

flag outputs

connected to the

flag bus are placed into High-Impedance. The user does

not have to select this High-Impedance state, a given multi-queue flow-control

device will automatically place its

flag output into High-Impedance when none

of its queues are selected for read operations.

When queues within a single device are selected for read operations, the

flag output of that device will maintain control of the

flag bus. Its

flag will

simply update between queue switches to show the respective queue output

valid status.

The multi-queue device places its

flag output into High-Impedance based

on the 3 bit ID code found in the 3 most significant bits of the read queue address

bus, RDADD. If the 3 most significant bits of RDADD match the 3 bit ID code setup

on the static inputs, ID0, ID1 and ID2 then the

flag output of the respective

device will be in a Low-Impedance state. If they do not match, then the

flag

output of the respective device will be in a High-Impedance state. See Figure

14,

Output Valid Flag Timng

for details of flag operation, including when more

than one device is connected in expansion.

ALMOST FULL FLAG

As previously mentioned the multi-queue flow-control device provides a

single Programmable Almost Full flag output,

PAF

. The

PAF

flag output provides

a status of the almost full condition for the active queue currently selected on the

write port for write operations. Internally the multi-queue flow-control device

monitors and maintains a status of the almost full condition of all queues within

it, however only the queue that is selected for write operations has its full status

output to the

PAF

flag. This dedicated flag is often referred to as the “active queue

almost full flag”. The position of the

PAF

flag boundary within a queue can be

at any point within that queues depth. This location can be user programmed

相關(guān)PDF資料	PDF描述
IDT72T51236L6BB	2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (4 QUEUES) 36 BIT WIDE CONFIGURATION 589,824 bits, 1,179,648 bits and 2,359,296 bits
IDT72T51236L6BBI	2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (4 QUEUES) 36 BIT WIDE CONFIGURATION 589,824 bits, 1,179,648 bits and 2,359,296 bits
IDT72T51246	2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (4 QUEUES) 36 BIT WIDE CONFIGURATION 589,824 bits, 1,179,648 bits and 2,359,296 bits
IDT72T51246L5BB	2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (4 QUEUES) 36 BIT WIDE CONFIGURATION 589,824 bits, 1,179,648 bits and 2,359,296 bits
IDT72T51246L6BB	2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (4 QUEUES) 36 BIT WIDE CONFIGURATION 589,824 bits, 1,179,648 bits and 2,359,296 bits

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