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GS81314PT18 Datenblatt(PDF) 6 Page - GSI Technology

Teilenummer GS81314PT18
Bauteilbeschribung  144Mb SigmaDDR-IVe??Burst of 2 Single-Bank ECCRAM?
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Hersteller  GSI [GSI Technology]
Direct Link  http://www.gsitechnology.com
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GS81314PT18/36GK-133/120/106
Specifications cited are subject to change without notice. For latest documentation see http://www.gsitechnology.com.
Rev: 1.09 5/2016
6/40
© 2014, GSI Technology
Initialization Summary
Prior to functional use, these devices must first be initialized and configured. The steps described below will ensure that the
internal logic has been properly reset, and that functional timing parameters have been configured.
Flow Chart
Power-Up
Reset SRAM
Training
Required?
Address / Control
Input Training
Read Data
Output Training
Write Data
Input Training
Normal Operation
Train
Again?
Yes
No
No
Yes
Enable PLL,
Wait for Lock
Additional
Wait for Calibrations
Configuration
Notes:
1. MZT and PZT[1:0] mode pins are used to set the default ODT state of all input
groups at power-up, and whenever RST is asserted High. The ODT state for
each input group can be changed any time thereafter using Register Write Mode
to program certain bits in the Configuration Registers.
2. Calibrations are performed for driver impedance, ODT impedance, and the PLL
current source immediately after RST is de-asserted Low. The calibrations can
take up to 384K cycles total. See the Power-Up and Reset Requirements section
for more information.
3. The PLL can be enabled by the PLL pin, or by the PLL Enable (PLE) bit in the
Configuration Registers. See the PLL Operation section for more information.
4. If the PLE register bit is used to enable the PLL, then Register Write Mode will
likely have to be utilized in the “Asynchronous, Pre-Input Training” method in
order to change the state of the bit, since Address / Control Input Training has
not yet been performed. See the Configuration Registers section for more infor-
mation.
5. It can take up to 64K cycles for the PLL to lock after it has been enabled.
6. Special Loopback Modes are available in these devices to perform Address /
Control Input Training; they are selected and enabled via the Loopback Mode
Select (LBK[1:0]) and Loopback Mode Enable (LBKE) bits in the Configuration
Registers.
7. If Loopback Modes are used to perform Address / Control Input Training, then
Register Write Mode will likely have to be utilized in the “Asynchronous,
Pre-Input Training” method in order to change the states of the LBK[1:0] and
LBKE register bits.
8. Loopback Modes can also be used for Read Data Output Training, if desired.
See the Signal Timing Training and Loopback Mode sections for more informa-
tion.
9. “Additional Configuration” includes any other configuration changes required by
the system. Since this step is performed after Address / Control Input Training,
Register Write Mode can be utilized in the “Asynchronous, Post-Input Training”
method (or perhaps the “Synchronous” method, if the synchronous timing
requirements can be met at the particular operating frequency).
10. It is up to the system to determine if/when re-training is necessary.


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