Broadcom BCM1250 User Manual page 13

User Manual
10/21/02
Section 13: GPIO.............................................................................................................. 397
Introduction .............................................................................................................................................. 397
The GPIO Pins .......................................................................................................................................... 397
GPIO Registers ......................................................................................................................................... 399
Other Pins That Can Be Used ................................................................................................................. 401
Serial Ports ......................................................................................................................................... 401
PCI ...................................................................................................................................................... 401
MACs .................................................................................................................................................. 401
PCMCIA Power Control Pins .............................................................................................................. 401
Section 14: Serial Configuration Interface .................................................................... 404
Introduction .............................................................................................................................................. 404
SMBus Overview ...................................................................................................................................... 404
Transport Protocol .............................................................................................................................. 404
Transport Protocol Reset .................................................................................................................... 406
SMBus Protocol .................................................................................................................................. 406
Extended Protocol............................................................................................................................... 408
Programming Model ................................................................................................................................ 410
Using SMBus Protocols ...................................................................................................................... 410
Using Extended Protocols................................................................................................................... 412
Direct Access ........................................................................................................................................... 413
Booting Using an SMBus EEPROM........................................................................................................ 413
Switching from SMBus Mode .............................................................................................................. 414
SMBus Registers...................................................................................................................................... 416
Section 15: JTAG and Debug.......................................................................................... 422
Introduction .............................................................................................................................................. 422
TAP Controller .......................................................................................................................................... 422
BYPASS Instruction ..................................................................................................................... 425
IDCODE Instruction ..................................................................................................................... 425
WAFERID Instruction................................................................................................................... 425
IMPCODE Instruction .................................................................................................................. 426
ADDRESS Instruction .................................................................................................................. 426
DATA Instruction.......................................................................................................................... 426
CONTROL Instruction.................................................................................................................. 426
Document 1250_1125-UM100CB-R
B roa dcom Co rpo rat ion
BCM1250/BCM1125/BCM1125H
Page xiii