pacToRow_(b1, b2) {
    const ccRowTab = [
      11, 11,  // 0x00 or 0x01
      1, 2,    // 0x02 -> 0x03
      3, 4,    // 0x04 -> 0x05
      12, 13,  // 0x06 -> 0x07
      14, 15,  // 0x08 -> 0x09
      5, 6,    // 0x0A -> 0x0B
      7, 8,    // 0x0C -> 0x0D
      9, 10,   // 0x0E -> 0x0F
    ];
    return ccRowTab[((b1 & 0x07) << 1) | ((b2 >> 5) & 0x01)];
  }
Gets the row index from a Preamble Address Code byte pair.
@param {number} b1 Byte 1.
@param {number} b2 Byte 2.
@return {number} Row index.
@private