1. Board Design > Power Management
13
Tsi382 (BGA) Evaluation Board User Manual
60E2010_MA001_03
Integrated Device Technology
www.idt.com
1.4.3
Power Sequencing
On power-up, the board’s power sequence is as follows:
1.
1.2V powered on
2.
PCI I/O slot power and pull-ups, and Tsi382 3.3V
12V/-12V/5V PCI are not sequence controlled.
1.4.4
System Power Design
Figure 2
illustrates the power distribution for the riser card. The following list is a functional summary
of the power design:
1.
Sequencing control over the following rails:
•
3.3V PCI
•
3.3V Tsi382 I/O/PCIe A
VDD
•
1.2V Tsi382 Core/PCIe V
DD
2.
ATX 20-pin connector override, which disables all power draw from the PCIe system.
Figure 2: System Power Distribution
3v3/5v DC/DC
Regulator
(TPS5124)
PCIe
System
12v
ATX
20-pin
-12v
12v
5v
3.3v
Unused
GND
1.2v DC/DC
12V
3.3V
1.2V
Power
Sequencer
3.3v/5v Disable
1.2V PCIE_VDD
3.3V PCIE AVDD
-12V
3.3V I/O
PCI
Bus
Connectors
Current
Sense
Current
Sense
Current
Sense
Current
Sense
Tsi382
Electronic/Mech
Breaker w/
Current Limit
