参数资料
型号: GS4576S09L-25
厂商: GSI TECHNOLOGY
元件分类: DRAM
英文描述: DDR DRAM, PBGA144
封装: UBGA-144
文件页数: 3/64页
文件大小: 2691K
代理商: GS4576S09L-25
Preliminary
GS4576S09/18L
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Rev: 1.01 4/2011
11/64
2011, GSI Technology
On–Die Termination (ODT)
Mode Register Bit 9 (M9) set to 1 during an MRS command enables ODT. With ODT on, the Ds, Qs, and DM are terminated to
VTT with a resistance, RTT. Command, address, QVLD, and clock signals are not terminated. The diagram below shows the
equivalent circuit of a D receiver with ODT. When a Q begins to drive after a Read command is issued, the ODT function is briefly
switched off. When a Q stops driving at the end of a data transfer, ODT is switched back on. D and DM pins are always terminated.
On–Die Termination DC Parameters
Description
Symbol
Min
Max
Units
Notes
Termination Voltage
VTT
0.95 * VREF
1.05 * VREF
V
1, 2
On–Die Termination
RTT
125
185
Ω
3
Notes:
1. All voltages referenced to VSS (GND).
2. VTT is expected to be set equal to VREF and must track variations in the DC level of VREF.
3. The RTT value is measured at 95°C TC.
VTT
SW
RTT
Receiver
D
VREF
On–Die Termination–Equivalent Circuit
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