3.3 VOLT CMOS TRIPLE BUS
SyncFIFOTM WITH BUS-MATCHING
256 x 36 x 2, 512 x 36 x 2,
1,024 x 36 x 2
IDT72V3626
IDT72V3636
IDT72V3646
three default offsets (8, 16 and 64)
• Serial or parallel programming of partial flags
• Big- or Little-Endian format for word and byte bus sizes
• Master Reset clears data and configures FIFO, Partial Reset
clears data but retains configuration settings
ꢀEATURES:
• Memory storage capacity:
IDT72V3626–256 x 36 x 2
IDT72V3636–512 x 36 x 2
IDT72V3646–1,024 x 36 x 2
• Mailbox bypass registers for each FIFO
• Clock frequencies up to 100 MHz (6.5ns access time)
• Two independent FIFOs buffer data between one bidirectional
36-bit port and two unidirectional 18-bit ports (Port C receives
and Port B transmits)
• 18-bit (word) and 9-bit (byte) bus sizing of 18 bits (word) on
Ports B and C
• Select IDT Standard timing (using EFA, EFB, FFA, and FFC flag
functions) or First Word Fall Through Timing (using ORA, ORB,
IRA, and IRC flag functions)
• Free-running CLKA, CLKB and CLKC may be asynchronous or
coincident (simultaneous reading and writing of data on a single
clock edge is permitted)
• Auto power down minimizes power dissipation
• Available in a space-saving 128-pin Thin Quad Flatpack (TQFP)
• Pin and functionally compatible versions of 5V operating
IDT723626/723636/723646
• Industrial temperature range (–40°C to +85°C) is available
• Programmable Almost-Empty and Almost-Full flags; each has
ꢀUNCTIONAL BLOCK DIAGRAM
MBF1
Mail 1
Register
CLKA
18
CSA
Port-A
B0-B17
W/RA
ENA
MBA
Control
RAM ARRAY
36
36
Logic
256 x 36
512 x 36
1,024 x 36
CLKB
RENB
CSB
Port-B
Control
Logic
FIFO1,
Mail1
Reset
Logic
MRS1
PRS1
MBB
Read
Pointer
Write
Pointer
SIZEB
36
Status Flag
Logic
FFA/IRA
EFB/ORB
AFA
AEB
FIFO1
FIFO2
Common
Port
SPM
FS0/SD
Control
Logic
Timing
Mode
BE
Programmable Flag
Offset Registers
FS1/SEN
(B and C)
A0-A35
10
FWFT
FFC/IRC
AFC
Status Flag
Logic
EFA/ORA
AEA
Read
Pointer
Write
Pointer
FIFO2,
Mail2
Reset
Logic
MRS2
PRS2
36
RAM ARRAY
256 x 36
18
36
36
C0-C17
512 x 36
1,024 x 36
CLKC
WENC
MBC
Port-C
Control
Logic
Mail 2
Register
SIZEC
4665 drw01
MBF2
IDT,theIDTlogoareregisteredtrademarksofIntegratedDeviceTechnology,Inc. SyncFIFOisatrademarkofIntegratedDeviceTechnology,Inc.
AUGUST 2001
COMMERCIAL TEMPERATURE RANGE
1
2001 Integrated Device Technology, Inc. All right reserved. Product specifications subject to change without notice.
DSC-4665/4