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參數(shù)資料

型號(hào)：	IDT72T51253L6BB
廠商：	INTEGRATED DEVICE TECHNOLOGY INC
元件分類：	DRAM
英文描述：	2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
中文描述：	128K X 18 OTHER FIFO, 3.7 ns, PBGA256
封裝：	17 X 17 MM, 1 MM PITCH, PLASTIC, BGA-256
文件頁數(shù)：	21/55頁
文件大?。?/td>	544K
代理商：	IDT72T51253L6BB

IDT72T51233/72T51243/72T51253 2.5V, MULTI-QUEUE FLOW-CONTROL DEVICES

(4 QUEUES) 18 BIT WIDE CONFIGURATION 589,824, 1,179,648 and 2,359,296 bits

COMMERCIAL AND INDUSTRIAL

TEMPERATURE RANGES

OUTPUT VALID FLAG OPERATION

The multi-queue flow-control devices 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

devices 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 devices 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

via the serial port or one of the default values (8 or 128) can be selected if the

user has performed default programmng.

As mentioned, every queue within a multi-queue device has its own almost

full status, when a queue is selected on the write port, this status is output via the

PAF

flag. The

PAF

flag value for each queue is programmed during multi-queue

device programmng (along with the number of queues, queue depths and

almost empty values). The

PAF

offset value, m for a respective queue can be

programmed to be anywhere between 0’ and D’, where D’ is the total memory

depth for that queue. The

PAF

value of different queues within the same device

can be different values.

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

PAF

flag output

will switch to the new queue and provide the user with the new queue status,

on the third cycle after a new queue selection is made, on the same WCLK cycle

that data can actually be written to the new queue. That is, a new queue can

be selected on the write port via the WRADD bus, WADEN enable and a rising

edge of WCLK. On the third rising edge of WCLK following a queue selection,

the

PAF

flag output will show the full status of the newly selected queue. The

PAF

is flag output is triple register buffered, so when a write operation occurs at the

almost full boundary causing the selected queue status to go almost full the

PAF

will go LOW 3 WCLK cycles after the write. The same is true when a read occurs,

there will be a 3 WCLK cycle delay after the read operation.

So the

PAF

flag delays are:

froma write operation to

PAF

flag LOW is 2 WCLK + t

WAF

The delay froma read operation to

PAF

flag HIGH is t

SKEW2

+ WCLK + t

WAF

Note, if t

SKEW

is violated there will be one added WCLK cycle delay.

The

PAF

flag is synchronous to the WCLK and all transitions of the

PAF

flag

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

monitors and keeps a record of the almost full status for all queues. It is possible

that the status of a

PAF

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 almost full flag status based

on read operations. The multi-queue flow-control devices also provides a

duplicate of the

PAF

flag on the

PAF

[3:0] flag bus, this will be discussed in detail

in a later section of the data sheet.

See Figures 19 and 20 for Almost Full flag timng and queue switching.

ALMOST EMPTY FLAG

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

single Programmable Almost Empty flag output,

PAE

. The

PAE

flag output

provides a status of the almost empty condition for the active queue currently

selected on the read port for read operations. Internally the multi-queue flow-

control device monitors and maintains a status of the almost empty condition of

all queues within it, however only the queue that is selected for read operations

has its empty status output to the

PAE

flag. This dedicated flag is often referred

to as the “active queue almost empty flag”. The position of the

PAE

flag boundary

相關(guān)PDF資料	PDF描述
IDT72T51233	2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
IDT72T51233L5BB	2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
IDT72T51233L5BBI	2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
IDT72T51233L6BB	2.5V MULTI-QUEUE FLOW-CONTROL DEVICES (32 QUEUES) 36 BIT WIDE CONFIGURATION 1,179,648 bits and 2,359,296 bits
IDT72T51233L6BBI	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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