LS1020A datasheet(17/71 Pages) FREESCALE

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Architecture

TWR-LS1021A Reference Manual, Rev. 0

2-2

Freescale Semiconductor

2.1

Processor

The TWR-LS1021A supports as many features of the LS1021A as possible, as detailed in the following

sections. In addition, TWR-LS1021A provides the ability to accept the pin-compatible LS1020A as well,

with changes as noted as necessary. A system with a TWR-LS1020A installed is referred to as a

TWR-LS1020A; the boards and supporting hardware are all identical, but the ability to use various

features depends on the device used.

Lastly, the TWR-LS1021A accept an interposer which allows early evaluation of boards but has limited

features and restrictions. A notable restriction of the interposer is that the P1010 used requires 3.3V on

OVDD, forcing IFC and other rails to operate and 3.3V. TWR-LS1021A support this by isolating

OVDD-powered signals through external translation devices or the FPGA where required.

2.2

Power

The power supply system of the TWR-LS1021A systems use power from a desktop power supply to

provide the numerous processor and peripheral device supplies required. In addition to meeting required

power specifications, the following goals guide the power supply architecture:

•

Monolithic power supply for VCC (powering internal cores and platform logic)

•

DUT-specific power rails are instrumented such that current measurement is possible

•

All power supplies can be sequenced per hardware specifications

The board is powered through barrel connector from a 5V @ 5A DC supply. The mating plug should have

an inner diameter of 2.1 mm and outer diameter of 5.5 mm. Figure 2-1 shows the polarity of the barrel

connector.

Figure 2-1. Power supply barrel connector polarity

The 5 V input is used to generate all voltages on the board. Additionally when used with TWR elevators

and other TWR peripherals, the TWR-LS1021A provides 5 V and 3.3 V supplies.

The power supplies provided are organized into general categories and described in individual sections

below. Table 2-2 shows a general summary of power supplies and features.

LS1020A Datasheet(PDF) 17 Page - Freescale Semiconductor, Inc