CLC030 datasheet(14/29 Pages) NSC

14 / 29 page

Device Operation (Continued)

logic-0. The TPG or BIST is halted by resetting TPG Enable.

The serial output data is present at the SDO outputs during

TPG or BIST operation.

Caution ! When attempting to use the TPG or BIST imme-

diately after applying power or resetting the device, the TPG

defaults to the 270Mbps SD rate and expects a V

CLK clock

frequency of 27MHz as input. This is because the code for

the test pattern in the TEST 0 register is set to 00h (525 line,

30 frame, 27MHz, NTSC 4x3 reference black). Attempting to

apply a V

CLK frequency higher than the device expects,

according to the setting in the TEST 0 register, may result in

the PLL locking up while attempting to slew to its maximum

possible frequency. This situation is not recoverable by the

use of the device RESET input. To recover from this condi-

tion, power must be removed and re-applied to the device.

Proper conditioning of the V

CLK input, which does not have

an internal pull down device, is mandatory to prevent admis-

sion of noise or unwanted signals at any time, especially

during power-up or reset sequences. It is strongly recom-

mended that V

CLK not be applied until device initialization

and configuration is completed.

Example: Enable the TPG Mode to use the NTSC 270Mbps

color bars as the BIST and TPG pattern. Enable TPG opera-

tion using the I/O port.

Set ANC/CTRL to a logic-low.

Set RD/WR to a logic-low.

Present 00Dh to AD[9:0] as the TEST 0 register ad-

dress.

Toggle ACLK.

Present 303h to AD[9:0] as the register data (525 line,

30 frame, 27MHz, NTSC 4x3, color bars (SMPTE

125M)).

Toggle ACLK.

Set TPG ENABLE (I/O Port, bit 7) to a logic-high.

Toggle ACLK.

The PASS/FAIL indicator (I/O Port, bit 6) is monitored

for the result of the test. Alternatively, the TEST 0 regis-

ter may be read. Bit 7 is the Pass/Fail indicator bit.

CONFIGURATION AND CONTROL REGISTERS

The configuration and control registers store data which

configures the operational modes of the CLC030 or which

result from its operation. Many of these registers can be

mapped to the multi-function I/O bus to make them available

as external I/O functions. These functions and initial values

are summarized in Table 1 and detailed in Table 2. The

power-on default condition for the multi-function I/O port is

indicated in Table 1 and detailed in Table 6.

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