16K x 8/9 Dual-Port Static RAM
with Sem, Int, Busy
CY7C006
CY7C016
Cypress Semiconductor Corporation
•
3901 North First Street
•
San Jose
•
CA 95134
•
408-943-2600
December 22, 1999
Features
• True dual-ported memory cells which allow
simultaneous reads of the same memory location
• 16K x 8 organization (CY7C006)
• 16K x 9 organization (CY7C016)
• 0.65-micron CMOS for optimum speed/power
• High-speed access: 15 ns
• Low operating power: ICC = 140 mA (typ.)
• Fully asynchronous operation
• Automatic power-down
• TTL compatible
• Expandable data bus to 16/18 bits or more using
Master/Slave chip select when using more than one
device
• Busy arbitration scheme provided
• Semaphores included to permit software handshaking
between ports
•INT flag for port-to-port communication
• Available in 68-pin PLCC (7C006), 64-pin (7C006) and
80-pin (7C016) TQFP
• Pin compatible and functional equivalent to
IDT7006/IDT7016
Functional Description
The CY7C006 and CY7C016 are high-speed CMOS 16K x 8
and 16K x 9 dual-port static RAMs. Various arbitration
schemes are included on the CY7C006/016 to handle situa-
tions when multiple processors access the same piece of data.
Two ports are provided, permitting independent, asynchro-
nous access for reads and writes to any location in memory.
The
CY7C006/016
can
be
utilized
as
a
standalone
128-/144-Kbit dual-port static RAM or multiple devices can be
combined in order to function as a 16-/18-bit or wider mas-
ter/slave dual-port static RAM. An M/S pin is provided for im-
plementing 16-/18-bit or wider memory applications without
the need for separate master and slave devices or additional
discrete logic. Application areas include interprocessor/multi-
processor designs, communications status buffering, and du-
al-port video/graphics memory.
Each port has independent control pins: Chip Enable (CE),
Read or Write Enable (R/W), and Output Enable (OE). Two
flags, BUSY and INT, are provided on each port. BUSY signals
that the port is trying to access the same location currently
being accessed by the other port. The Interrupt flag (INT) per-
mits communication between ports or systems by means of a
mail box. The semaphores are used to pass a flag, or token,
from one port to the other to indicate that a shared resource is
in use. The semaphore logic is comprised of eight shared
latches. Only one side can control the latch (semaphore) at
any time. Control of a semaphore indicates that a shared re-
source is in use. An automatic power-down feature is con-
trolled independently on each port by a Chip Enable (CE) pin
or SEM pin.
The CY7C006 and CY7C016 are available in 68-pin PLCC
(CY7C006), 64-pin (CY7C006) TQFP, and 80-pin (CY7C016) TQFP.
Notes:
1.
BUSY is an output in master mode and an input in slave mode.
2.
Interrupt: push-pull output and requires no pull-up resistor.
C006-1
R/WL
CEL
OEL
A 13L
A 0L
A 0R
A 13R
R/W R
CE R
OER
CER
OER
CE L
OEL
R/W L
R/W R
I/O7L
I/O0L
I/O 7R
I/O 0R
INTERRUPT
SEMAPHORE
ARBITRATION
CONTROL
I/O
CONTROL
I/O
MEMORY
ARRAY
ADDRESS
DECODER
ADDRESS
DECODER
SEM
L
SEMR
BUSYL
BUSYR
INTL
INTR
M/S
(7C016) I/O 8L
I/O8R (7C016)
[1,2]
[1,2]
[2]
[2]
Logic Block Diagram
with Sem, In t, Busy
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