72V263L6PFG IDT, 72V263L6PFG Datasheet - Page 4

• Manufacturer Part Number: 72V263L6PFG
• Description: FIFO
• Manufacturer: IDT

Specifications of 72V263L6PFG

• Product Category: FIFO
• Rohs: yes
• Part # Aliases: IDT72V263L6PFG

DESCRIPTION (CONTINUED)
not have to be asserted for accessing the first word. However, subsequent
words written to the FIFO do require a LOW on REN for access. The state of
the FWFT/SI input during Master Reset determines the timing mode in use.
can provide, the FWFT timing mode permits depth expansion by chaining FIFOs
in series (i.e. the data outputs of one FIFO are connected to the corresponding
data inputs of the next). No external logic is required.
FF/IR (Full Flag or Input Ready), HF (Half-full Flag), PAE (Programmable
Almost-Empty flag) and PAF (Programmable Almost-Full flag). The EF and
FF functions are selected in IDT Standard mode. The IR and OR functions are
selected in FWFT mode. HF, PAE and PAF are always available for use,
irrespective of timing mode.
memory. Programmable offsets determine the flag switching threshold and can
be loaded by two methods: parallel or serial. Eight default offset settings are also
provided, so that PAE can be set to switch at a predefined number of locations
from the empty boundary and the PAF threshold can also be set at similar
predefined values from the full boundary. The default offset values are set during
Master Reset by the state of the FSEL0, FSEL1, and LD pins.
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC II
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
For applications requiring more data storage capacity than a single FIFO
PAE and PAF can be programmed independently to switch at any point in
These FIFOs have five flag pins, EF/OR (Empty Flag or Output Ready),
PROGRAMMABLE ALMOST-FULL (PAF)
FULL FLAG/INPUT READY (FF/IR)
FIRST WORD FALL THROUGH/
WRITE CLOCK (WCLK/WR*)
(x9 or x18) DATA IN (D0 - Dn)
SERIAL INPUT (FWFT/SI)
WRITE ENABLE (WEN)
SERIAL ENABLE(SEN)
Figure 1. Single Device Configuration Signal Flow Diagram
PARTIAL RESET (PRS)
INPUT WIDTH (IW)
LOAD (LD)
MATCHING
72V223
72V233
72V243
72V253
72V263
72V273
72V283
72V293
(BM)
BUS-
4
IDT
are used to load the offset registers via the Serial Input (SI). For parallel
programming, WEN together with LD on each rising edge of WCLK, are used
to load the offset registers via D
of RCLK can be used to read the offsets in parallel from Q
serial or parallel offset loading has been selected.
write pointers are set to the first location of the FIFO. The FWFT pin selects
IDT Standard mode or FWFT mode.
location of the memory. However, the timing mode, programmable flag
programming method, and default or programmed offset settings existing
before Partial Reset remain unchanged. The flags are updated according to the
timing mode and offsets in effect. PRS is useful for resetting a device in mid-
operation, when reprogramming programmable flags would be undesirable.
Empty flag) and PAF (Programmable Almost-Full flag) outputs. The timing
modes can be set to be either asynchronous or synchronous for the PAE and
PAF flags.
LOW on the LOW-to-HIGH transition of RCLK. PAE is reset to HIGH on the LOW-
MASTER RESET (MRS)
TM
For serial programming, SEN together with LD on each rising edge of WCLK,
During Master Reset (MRS) the following events occur: the read and
The Partial Reset (PRS) also sets the read and write pointers to the first
It is also possible to select the timing mode of the PAE (Programmable Almost-
If asynchronous PAE/PAF configuration is selected, the PAE is asserted
NARROW BUS FIFO
OUTPUT WIDTH (OW)
(x9 or x18) DATA OUT (Q0 - Qn)
RETRANSMIT (RT)
PROGRAMMABLE ALMOST-EMPTY (PAE)
READ CLOCK (RCLK/RD*)
READ ENABLE (REN)
EMPTY FLAG/OUTPUT READY (EF/OR)
HALF-FULL FLAG (HF)
BIG-ENDIAN/LITTLE-ENDIAN (BE)
INTERSPERSED/
NON-INTERSPERSED PARITY (IP)
OUTPUT ENABLE (OE)
n
. REN together with LD on each rising edge
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
FEBRUARY 11, 2009
n
4666 drw03
regardless of whether