Preliminary
GS8672T19/37AE-400/375/333/300
72Mb SigmaDDR-II+TM
Burst of 2 ECCRAMTM
400 MHz–300 MHz
165-Bump BGA
Commercial Temp
Industrial Temp
1.8 V V
DD
1.8 V and 1.5 V I/O
Features
Clocking and Addressing Schemes
• On-Chip ECC with virtually zero SER
• 2.0 Clock Latency
• Simultaneous Read and Write SigmaDDR™ Interface
• Common I/O bus
• JEDEC-standard pinout and package
• Double Data Rate interface
The GS8672T19/37AE SigmaDDR-II+ ECCRAMs are
synchronous devices. They employ two input register clock
inputs, K and K. K and K are independent single-ended clock
inputs, not differential inputs to a single differential clock input
buffer.
• Byte Write Capability
• Burst of 2 Read and Write
• 1.8 V +100/–100 mV core power supply
• 1.5 V or 1.8 V HSTL Interface
• Pipelined read operation with self-timed Late Write
• Fully coherent read and write pipelines
• ZQ pin for programmable output drive strength
• IEEE 1149.1 JTAG-compliant Boundary Scan
• Pin-compatible with present 9Mb, 18Mb, 36Mb and future
144Mb devices
Common I/O x36 and x18 SigmaDDR-II+ B2 RAMs always
transfer data in two packets. When a new address is loaded, A0
presets an internal 1 bit address counter. The counter
increments by 1 (toggles) for each beat of a burst of two data
transfer. Because the LSB is tied off internally, the address
field of a SigmaDDR-II+ B2 RAM is always one address pin
less than the advertised index depth (e.g., the 4M x 18 has a
2M addressable index).
On-Chip Error Correction Code
• 165-bump, 15 mm x 17 mm, 1 mm bump pitch BGA package
• RoHS-compliant 165-bump BGA package available
GSI's ECCRAMs implement an ECC algorithm that detects
and corrects all single-bit memory errors, including those
induced by Soft Error Rate (SER) events such as cosmic rays,
alpha particles etc. The resulting SER of these devices is
anticipated to be <0.002 FITs/Mb — a 5-order-of-magnitude
improvement over comparable SRAMs with no On-Chip ECC,
which typically have an SER of 200 FITs/Mb or more. SER
quoted above is based on reading taken at sea level.
SigmaDDR™ ECCRAM Overview
The GS8672T19/37AE ECCRAMs are built in compliance
with the SigmaDDR-II+ SRAM pinout standard for Common
I/O synchronous ECCRAMs. They are 75,497,472-bit (72Mb)
ECCRAMs. The GS8672T19/37AE SigmaCIO ECCRAMs are
just one element in a family of low power, low voltage HSTL
I/O ECCRAMs designed to operate at the speeds needed to
implement economical high performance networking systems.
However, the On-Chip Error Correction (ECC) will be
disabled if a “Half Write” operation is initiated. See the Byte
Write Contol section for further information.
Parameter Synopsis
-400
2.5 ns
0.45 ns
-375
-333
3.0 ns
0.45 ns
-300
3.3 ns
0.45 ns
tKHKH
tKHQV
2.66 ns
0.45 ns
Rev: 1.00 5/2010
1/28
© 2010, GSI Technology
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.