Broadcom BCM5722 - Table 382: Auxiliary Smbus Master Control Register (Offset 0 X6 C44)

BCM5722 Programmer’s Guide
10/15/07
Broadcom Corporation
Page 363 ASF Support Registers Document 5722-PG101-R
AUXILIARY SMBUS MASTER CONTROL REGISTER (OFFSET 0X6C44)
Table 382: Auxiliary SMBus Master Control Register (Offset 0x6C44)
Bit Field Description Init Access
31:30 Reserved – 0 RO
29 SMBus Slave Soft Reset Setting this bit will reset the SMBus slave interface. 0 R/W
28 SMBus Softreset
• 0 = Normal operation.
• 1 = Resets the SMBus Interface.
0R/W
27:24 SM Module Attention Selection This field selects which GRC Attention is asserted when an
SMBus interrupt occurs.
0R/W
23:20 Reserved – 0 RO
19 SM_DATA Pin Control
• 0 = Drive the SM_DATA pin low.
• 1 = No functional impact on the SM_DATA pin.
0R/W
18 SM_CLK Pin Control
• 0 = Drive the SM_CLK pin low.
• 1 = No functional impact on the SM_CLK pin.
0R/W
17 SM_DATA Pin Current Status This bit returns the value on the SM_DATA pin. This allows
software to read the current state of the pin.
0RO
16 SM_CLK Pin Current Status This bit returns the value on the SM_CLK pin. This allows
software to read the current state of the pin.
0RO
15:11 Reserved – 0 RO
10 Slave Read Attention Enable
• 0 = SMBus Slave will not wait for status bit to be cleared
before supplying the data.
• 1 = SMBus Slave will stretch the clock until the status bit is
cleared.
0R/W
9 Bit-Bang Interface Enable
• 0 = Bit-Bang Interface Disabled.
• 1 = Bit-Bang Interface Enabled.
0R/W
8 SM Bus Speed
• 0 = 100 Hz SMBus Interface.
• 1 = 400 Hz SMBus Interface.
0R/W
7 CRC/PEC Enable
• 0 = Disable CRC/PEC.
• 1 = Enable CRC/PEC generation.
0R/W
6Start
• 0 = Has no effect. Always read a 0.
• 1 = Execution start. Writing a 1 in this field initiates SMBus
controller Master Interface to execute the command
programmed in the SMB command port field.
0R/W
5 Reserved – 0 RO
4:2 SMBus Command Protocol Select the type of command the SMBus Controller Master
interface will execute. Reads and writes are determined by bit 0
of SMBus master address register:
• 000 = Quick Read or Write.
• 001 = Byte Read or Write.
• 010 = Byte Data Read or Write.
• 011 = Word Data Read or Write.
• 100 = Reserved.
• 101 = Block Read or Write.
• 110 = Block write-block read process call.
• 111 = Reserved.
000 R/W