Table of constant values and their specified constant labels.

00  LED
01  SW
10  UART_DATA
11  UART_CTRL
20  I2C_DATA
21  I2C_CTRL
30  CAM_CTRL
40  MEM_ADDR0
41  MEM_ADDR1
42  MEM_ADDR2
43  MEM_DATA
44  MEM_CTRL
50  DCT_DATA
51  DCT_CTRL
