AL5DAxxxx
3.3V, 5V Asynchronous Dual-Port SRAM
1k/2k/4K/8K/16K/32K x 8/9/16/18-bit
Features
!
True dual port memory cells up to 256/288Kb
!
Fully asynchronous dual-port SRAM aimed at communications market
!
Max. access time: 30 ns
!
Separate upper byte and lower byte control for multiplexed bus compatibility (only for 16/18 bit
devices)
!
Supports byte write/read for 16/18 bit devices
!
On-chip arbitration logic support 3 modes: Busy, Interrupt and Semaphore
-
Busy scheme circuit arbitrate between 2 ports
-
interrupt mechanism allow port to port communication
-
Full hardware support of semaphore to permit software handshaking between ports
!
Versatile pin select for Master or Slave mode:
M/ S
=
V
IH
for
BUSY
output flag on master;
M/ S
=
V
IL
for
BUSY
input flag on slave
!
Expandable data bus to 32/36 bits or more using master/slave chip select when using more than one
device
!
Separate upper-byte and lower-byte controls for bus matching (only for 16/18 bit devices)
!
3.3v and 5v series low power respectively
!
Compatible and functionally equivalent to IDT or Cypress
!
Available in 52-PLCC, 68-PLCC, 84-PLCC, 64-TQFP/STQFP, 80-TQFP, 100-TQFP
Architecture
IO
8/9L-15/17L
IO
0L - 7/8L
IO
8/9L -15/17R
IO
0R - 7/8R
A
10L - 14L
A
A
10R -14R
A
0L - 9L
0R - 9R
CE
L
CE
R
OE
L
UB
L
LB
L
OE
R
UB
R
LB
R
R/ W
L
(
1
,
2
)
BUSY
L
SEM
L
(
2
)
INT
L
R/ W
R
(
1
,
2
)
BUSY
R
SEM
R
(
2
)
INT
R
M/ S
©2003 -Copyright by AverLogic Technologies, Corp.
1-F-PMK008-0001
Function Description
The asynchronous dual-port SRAMs allow fully independent access to any memory location from
both ports without the need of an additional discrete logic. There are separate address, data and control
signals for each port. They can be utilized as either a standalone 8/9/16/18-bit dual-port static RAM or
as a MASTER/SLAVE cascade form in systems requiring 32/36-bit or greater word widths through pin
M/ S
. Master and slave devices provide two independent ports with separate control, address and I/O
pins that permit independent, error-free and asynchronous access for reads and writes to any location in
the memory. It is the solution for applications requiring shared or buffered data such as cache memory
for DSP, bit-slice, or multiprocessor designs. Each port has independent control pins; chip enable (
CE
),
write enable (
R/ W
), and output enable (
OE
). In addition, a Busy, Interrupt or Semaphore logic may be
provided to block the port trying to access the same cell location currently being accessed by the other
port. The
AL5DAxxxx
series are high speed asynchronous CMOS dual-port SRAMs configured as
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1K/2K x 8-bit organization (AL5DA002/3; Master; Busy Interrupt;3.3V or 5.V)
2Kx8-bit organization (AL5DA132; Master; Busy; 3.3V or 5.V)
4Kx8-bit organization (AL5DA134; 3.3V or 5.V)
4Kx8-bit organization (AL5DA004; Semaphore; 3.3V or 5.V)
4Kx8-bit organization (AL5DA138; Master/Slave; Busy Interrupt Semaphore; 3.3V or 5.V)
8K/16K/32Kx8-bit organization (AL5DA005/6/7; Master/Slave; Busy Interrupt Semaphore; 3.3V or 5.V)
2Kx9-bit organization (AL5DA013; Master; Busy Interrupt; 3.3V or 5.V)
4Kx9-bit organization (AL5DA139; Master/Slave; Busy Interrupt Semaphore; 3.3V or 5.V)
8K/16K/32Kx9-bit organization (AL5DA015/6/7; Master/Slave; Busy Interrupt Semaphore; 3.3V or 5.V)
2Kx16-bit organization (AL5DA023; Master; Busy; 3.3V or 5.V)
4K/8K/16Kx16-bit organization (AL5DA024/5/61; Master/Slave; Busy Interrupt Semaphore; 3.3V or 5.V)
16Kx16-bit organization (AL5DA026; Master/Slave; Busy Semaphore; 3.3V or 5.V)
4K/8K/16Kx18-bit organization (AL5DA034/5/6; Master/Slave; Busy Interrupt Semaphore, 3.3V or 5.V)
1Kx8-bit organization (AL5DA140; Slave; Busy Interrupt; 3.3V or 5.V)
2Kx8-bit organization (AL5DA142; Slave; Busy; 3.3V or 5.V)
2Kx8-bit organization (AL5DA421; Slave; Busy Interrupt; 3.3V or 5.V)
2Kx9-bit organization (AL5DA125; Slave; Busy Interrupt; 3.3V or 5.V)
2Kx16-bit organization (AL5DA143; Slave; Busy; 3.3V or 5.V)
For more information regarding
AL5DAxxxx
asynchronous Dual-Port SRAM or other AverLogic
products, please contact us, your local authorized representatives or visit our web site.
Applications
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Cellular Base Stations
Multi-protocol Routers
Internet Appliance
ATM
Ethernet
LAN/WAN Switches
Hubs
PBXs
RAIDs (Storage Networks)
Set-top Boxes
Video Conferencing
Graphics Accelerators
!
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Audio/Video Editing
Ultrasound Imaging
Satellite Encoders
Cable Modems
Flight Simulators
High-end Printing Servers
Call Distribution Systems
Fiber Channel Line Boards
Aerospace Instrumentation
Industrial Controls
Any circuit where data must be passed
between different processors
AverLogic Technologies Corp.
E-mail:
sales@averlogic.com.tw
URL:
http://www.averlogic.com.tw
AverLogic Technologies, Inc.
E-mail:
sales_usa@averlogic.com
URL:
http://www.averlogic.com
©2003 -Copyright by AverLogic Technologies, Corp.
1-F-PMK008-0001
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