L64767 LSI Logic Corporation, L64767 Datasheet - Page 10

• Manufacturer Part Number: L64767
• Description: Smatv Qam Encoder
• Manufacturer: LSI Logic Corporation

Test Unit
Signal Descriptions
10
The internal registers you configure through the microprocessor define
the primary operational modes of the L64767. These modes and
configurations include the following, among many others:
The microprocessor interface is related to microcontrollers of the 68xxx
family. The L64767 is not dedicated to supporting high-speed burst
modes of DMA controllers with continuously asserted CS_N signal at the
interface.
If the L64767 detects an error, the error is indicated on output pins of the
L64767 and through the microprocessor interface. Error indications like
the FIFOALARM signal are helpful for debugging and troubleshooting.
A built-in scan chain executes the functionality test. The pins
SCAN_ENABLE, SCAN_MODE, and T_N are used for this purpose.
This section describes the L64767’s interface signals. As shown in
these signals are grouped into the following categories:
Within each category, the signals are described in alphabetical order by
signal mnemonic.
L64767 SMATV QAM Encoder
Input synchronization mode (whether to lock synchronization to sync
bytes or input pulses)
Nyquist filter coefficients
Delay value for proper FIFO initialization
Input signals (for example, those from an LSI Logic L64704 for the
MPEG-2 TL MUX)
Output signals (for example, to an analog QAM modulator)
Control signals (including test pins)
Microprocessor interface signals
Figure
4,