TeleChips TCC720, User Manual, Page: 52 / 143

TCC720
GPIO PORT
32-bit RISC Microprocessor for Digital Media Player
Dec. 16. 2002
Preliminary Spec 0.51
6 - 7
GPIO_B Test Select Register (GTSEL_B) 0x8000031C
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
0 EXT GST[2:0] 0
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
IDE
*) if a bit is set to 1, and the corresponding bit of GSEL_B is 0, GPIO pin is used by the other
dedicated function blocks.
EXT
[24]
GPIO_B[24] Function Select
0 GPIO_B[24] pin is working as Normal GPIO Function or I2S Data Output
1 GPIO_B[24] pin is working as EXTCLK from Clock Controller
IDE
[9]
GPIO_B[9] Function Select
0 GPIO_B[9] pin is working as Normal GPIO Function or UART Data Input
1 GPIO_B[9] pin is working as chip select 1 for IDE
GST[2:0]
[23:21]
GPIO_B[23:21] Function Select
0 GPIO_B[23:21] pin is working as Normal GPIO Function
GST[2] = 1
GST[1] = 1
GST[0] = 1
GPIO_B[23] pin is working as FRM of 1 of 4 GSIO blocks
GPIO_B[22] pin is working as SCK of 1 of 4 GSIO blocks
GPIO_B[21] pin is working as SDO of 1 of 4 GSIO blocks
*) this bit field is only valid only if the corresponding bit of GSEL_B is set to 0