USB7252CTSLASHKDX datasheet(51/63 Pages) MICROCHIP

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2021 Microchip Technology Inc.

DS00003852A-page 51

9.6.5

USB ATTACH COMMAND TO SMBUS SLAVE READY TIMING

Figure 9-6 illustrates the SMBus Slave interface readiness in relation to ACK of the Slave interface to the “USB Attach

with SMBus Runtime Access” (AA56h) from the SMBus Master. In order to ensure reliable SMBus slave operation, the

SMBus master must allow the bus to remain idle after issuing the “USB Attach with SMBus Runtime Access” until tAT-

TACH_RDY timing has been met.

Note 6: The tATTACH_RDY values are preliminary and subject to change.

9.6.6

USB TIMING

All device USB signals conform to the voltage, power, and timing characteristics/specifications as set forth in the Uni-

versal Serial Bus Specification. Please refer to the Universal Serial Bus Revision 3.2 Specification, available at http://

www.usb.org/developers/docs.

9.6.7

SMBUS TIMING

All device SMBus signals conform to the voltage, power, and timing characteristics/specifications as set forth in the Sys-

tem Management Bus Specification. Please refer to the System Management Bus Specification, Version 1.0, available

at http://smbus.org/specs.

9.6.8

I2C TIMING

All device I2C signals conform to the 100KHz Standard-mode (Sm) and 400KHz Fast Mode (Fm) voltage, power, and

timing characteristics/specifications as set forth in the I2C-Bus Specification. Please refer to the I2C-Bus Specification,

available at http://www.nxp.com/documents/user_manual/UM10204.pdf.

9.6.9

I2S TIMING

All device I2S signals conform to the voltage, power, and timing characteristics/specifications as set forth in the I2S-Bus

Specification. Please refer to the I2S-Bus Specification, available at www.sparkfun.com/datasheets/BreakoutBoards/

I2SBUS.pdf

Note:

When accessing SMBus during runtime, it is critical to force some clocks to stay on. If this step is not taken,

the SMBus slave interface will not be accessible while the hub is placed into a Suspend state by the host.

FIGURE 9-6:

USB ATTACH COMMAND TO SMBUS SLAVE READY TIMING

TABLE 9-8:

USB ATTACH COMMAND TO SMBUS SLAVE READY TIMING

Symbol

Description

Min

Typ

Max

Units

tATTACH_RDY USB Attach command to SMBus ready (Note 6)

11.5

SMBus

SMBus commands accepted

(if ‘Attach with I2C slave enabled during

runtime’ command is used)

SMBus interface not available

(slave interface will stretch clock if addressed)

SOC_CFG Stage

Attach

Command ACK

Runtime Stage

SOC_CFG Stage

At tach

Command

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