DLPC4420ZPC datasheet(30/49 Pages) TI

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7.3.8 Board Level Test Support

The in-circuit tri-state enable signal (ICTSEN) is a board level test control signal. By driving ICTSEN to a logic

high state, all controller outputs (except TDO1 and TDO2) are tri-stated.

The DLPC4420 controller also provides JTAG boundary scan support on all I/O except non-digital I/O and a few

special signals. Table 7-5 defines these exceptions.

Table 7-5. DLPC4420- Signals Not Covered by JTAG

Signal Name

PKG Ball

HW_TEST_EN

M25

MOSC

M26

MOSCN

N26

USB_DAT_N

USB_DAT_P

TCK

N24

TDI

N25

TRSTZ

M23

TDO1

N23

TDO2

N22

TMS1

P25

TMS2

P26

7.4 Device Functional Modes

The DLPC4420 has two functional modes which are enabled via software command via the Host control

interface. These modes are Standby and Active.

7.4.1 Standby Mode

The system is powered up and active, however, some blocks within the controller have been shut down to

conserve power. Only the µProcessor and its peripherals are active (supporting a dormant projector waiting to be

woken up). In this mode the DMD is parked and no image can be displayed.

7.4.2 Active Mode

The system is powered up and fully operational, capable of projecting internal or external video sources.

7.4.2.1 Normal Configuration

This configuration enables the full functionality of the DLPC4420.

DLPC4420

DLPS222 – DECEMBER 2021

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