may also be used to set the internal clock speed [may be device dependent]. Unused clock lines are held high via an internal pull-up. Unused RX or TX lines may require an external 47k pull-down resistor [may be device dependent]. Software selectable internal pull-downs for signals may be provided on some devices. Packet format The packet format is: SOP, 10 bits CMD1, 10 bits; or PktType, 10 bits CMD2, 10 bits; or AdMask, 10 bits ByteCnt, 10 bits Address, 10 bits [could be up to 4 words] Data, 10 bits [could be 'N' words long] EOP, 10 bits 8B/10B encoding The IBM patented encoding method used for encoding 8-bit data bytes to 10-bit Transmission Characters. Data bytes are converted to Transmission Characters to improve the physical signal such that the following benefits are achieved: bit synchronization is more easily achieved, design of receivers and transmitters is simplified, error detection is improved, and control characters (i.e., the Special Character) can be distinguished from data characters. References TMS320DM644x DMSoC VLYNQ Port User's Guide for VLYNQ as implemented on one recent media processor Serial buses