— Up to 36-Gb/s bandwidth (250 MHz * 72 bit * 2 ports)
• Selectable pipelined or flow-through mode
• 1.5V or 1.8V core power supply
• Commercial and Industrial temperature ranges
• IEEE 1149.1 JTAG boundary scan
• Available in 484-ball PBGA Packages and 256-ball
FBGA Packages
• FullFlex72 family
— 18 Mbit: 256K x 36 x 2 DDR or 256K x 72 SDR
(CYDD18S72V18)
— 9 Mbit: 128K x 36 x 2 DDR or 128K x 72 SDR
(CYDD09S72V18)
— 4 Mbit: 64K x 36 x 2 DDR or 64 x 72 SDR
(CYDD04S72V18)
• FullFlex36 family
— 36 Mbit: 512K x 36 x 2 DDR (CYDD36S36V18)
— 18 Mbit: 256K x 36 x 2 DDR (CYDD18S36V18)
— 9 Mbit: 128K x 36 x 2 DDR (CYDD09S36V18)
— 4 Mbit: 64K x 36 x 2 DDR (CYDD04S36V18)
• FullFlex18 family
— 36 Mbit: 1M x 18 x 2 DDR (CYDD36S18V18)
— 18 Mbit: 512K x 18 x 2 DDR (CYDD18S18V18)
— 9 Mbit: 256K x 18 x 2 DDR (CYDD09S18V18)
— 4 Mbit: 128K x 18 x 2 DDR (CYDD04S18V18)
• Built-in deterministic access control to manage
address collisions
— Deterministic flag output upon collision detection
— Collision detection on back-to-back clock cycles
— First Busy Address readback
• Advanced features for improved high-speed data
transfer and flexibility
— Variable Impedance Matching (VIM)
— Echo clocks
— Selectable LVTTL (3.3V), Extended HSTL
(1.4V–1.9V), 1.8V LVCMOS, or 2.5V LVCMOS I/O on
each port
— Burst counters for sequential memory access
— Mailbox with interrupt flags for message passing
— Dual Chip Enables for easy depth expansion
Functional Description
The FullFlex™ Dual-Port SRAM families consist of 4-Mbit,
9-Mbit, 18-Mbit, and 36-Mbit synchronous, true dual-port static
RAMs that are high-speed, low-power 1.8V/1.5V CMOS. Two
ports are provided, allowing the array to be accessed simulta-
neously. Simultaneous access to a location triggers determin-
istic access control. For FullFlex72, these ports can operate
independently in DDR mode with 36-bit bus widths or in SDR
mode with 72-bit bus widths. For FullFlex36 and FullFlex18,
the ports operate in DDR mode only. Each port can be
independently configured for two pipelined stages for SDR
mode or 2.5 stages in DDR mode. Each port can also be
configured to operate in pipelined or flow-through mode in
SDR mode.
Advanced features include built-in deterministic access
control to manage address collisions during simultaneous
access to the same memory location, Variable Impedance
Matching (VIM) to improve data transmission by matching the
output driver impedance to the line impedance, and echo
clocks to improve data transfer.
To reduce the static power consumption, chip enables can be
used to power down the internal circuitry. The number of
cycles of latency before a change in CE0 or CE1 will enable
or disable the databus matches the number of cycles of read
latency selected for the device. In order for a valid write or read
to occur, both chip enable inputs on a port must be active.
Each port contains an optional burst counter on the input
address register. After externally loading the counter with the
initial address, the counter will increment the address inter-
nally.
Additional features of this device include a mask register and
a mirror register to control counter increments and
wrap-around. The counter-interrupt (CNTINT) flags notify the
host that the counter will reach maximum count value on the
next clock cycle. The host can read the burst-counter internal
address, mask register address, and busy address on the
address lines. The host can also load the counter with the
address stored in the mirror register by utilizing the retransmit
functionality. Mailbox interrupt flags can be used for message
passing, and JTAG boundary scan and asynchronous Master
Reset (MRST) are also available. The logic block diagram in
Figure 1
displays these features.
The FullFlex72 DDR family of devices is offered in a 484-ball
plastic BGA package. The FullFlex36 and FullFlex18 DDR
only families of devices are offered in both 484-ball and
256-ball fine pitch BGA packages.
Cypress Semiconductor Corporation
Document #: 38-06072 Rev. *I
•
198 Champion Court
•
San Jose
,
CA 95134-1709
•
408-943-2600
Revised December 21, 2006
FullFlex
FTSEL
L
CQEN
L
PORTSTD[1:0]
L
DDRON
L
DQ[71:0]
L
BE [7:0]
L
CE0
L
CE1
L
OE
L
R/W
L
CQ0
L
CQ0
L
CQ1
L
CQ1
L
CONFIG Block
CONFIG Block
FTSEL
R
CQEN
R
PORTSTD[1:0]
R
DDRON
R
DQ [71:0]
R
BE [7:0]
R
CE0
R
CE1
R
OE
R
R/W
R
CQ0
R
CQ0
R
CQ1
R
CQ1
R
IO
Control
IO
Control
Dual Ported Array
BUSY
L
A [19:0]
L
CNT/MSK
L
ADS
L
CNTEN
L
CNTRST
L
RET
L
CNTINT
L
C
L
C
L
WRP
L
Collision Detection
Logic
BUSY
R
A [19:0]
R
CNT/MSK
R
ADS
R
CNTEN
R
CNTRST
R
RET
R
CNTINT
R
C
R
C
R
WRP
R
Address &
Counter Logic
Address &
Counter Logic
Mailboxes
INT
L
INT
R
JTAG
TRST
TMS
TDI
TDO
TCK
READY
L
LowSPD
L
ZQ0
L
ZQ1
L
RESET
LOGIC
MRST
READY
R
LowSPD
R
ZQ0
R
ZQ1
R
Figure 1. Block Diagram
[1,2,3]
Notes:
1. The CYDD36S18V18 device has 20 address bits. The CYDD36S36V18, and the CYDD18S18V18 devices have 19 address bits. The CYDD18S72V18,
CYDD18S36V18, and the CYDD09S18V18 devices have 18 address bits. The CYDD09S72V18, CYDD04S18V18, and the CYDD09S36V18 devices have 17
address bits. The CYDD04S36V18 and the CYDD04S72V18 devices have 16 address bits.
2. The FullFlex72 family of devices has 72 data lines. The FullFlex36 family of devices has 36 data lines. The FullFlex18 family of devices has 18 data lines.
3. The FullFlex72 family of devices has eight byte enables. The FullFlex36 family of devices has four byte enables. The FullFlex18 family of devices has two byte
中风发生时，一切都是以秒来计算的。延误治疗可能导致大脑重大损伤。伦敦大学医学院的一位博士Alistair McEwan已经获得行为医学研究所(Action Medical Research)的同意，为急救人员开发一种无线诊断系统来减少时间延误。感谢抗血栓药物，一些病人在病情发作的三个小时之内可以完全恢复。但出血也会导致中风。医生在治疗之前需要确定发病原因，因为不适当的服用抗血栓药物会加重损害。...[详细]
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