USB3503 datasheet(13/73 Pages) MICROCHIP

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DS00001584B-page 13

USB3503

TABLE 3-4:

USB3503 SECONDARY REFERENCE CLOCK FREQUENCIES

3.3.4

INTERRUPT

The general interrupt pin (INT_N) is intended to communicate a condition change within the hub. The conditions that

may cause an interrupt are captured within a register mapped to the serial port (Register E8h: Serial Port Interrupt Status

- INT_STATUS). The conditions that cause the interrupt to assert can be controlled through use of an interrupt mask

The general interrupt and all interrupt conditions are functionally latched and event driven. Once the interrupt or any of

the conditions have asserted, the status bit will remain asserted until the SOC negates the bit using the serial port. The

bits will then remain negated until a new event condition occurs. The latching nature of the register causes the status to

remain even if the condition that caused the interrupt ceases to be active. The event driven nature of the register causes

the interrupt to only occur when a new event occurs- when a condition is removed and then is applied again.

The function of the interrupt and the associated status and masking registers are illustrated in Figure 3-3. Registers &

TABLE 3-3:

USB3503 PRIMARY REFERENCE CLOCK FREQUENCIES

REF_SEL[1:0]

Frequency (MHz)

‘00’

38.4

‘01’

26.0

‘10’

19.2

‘11’

12.0

REF_SEL[1:0]

Frequency (MHz)

‘00’

24.0

‘01’

27.0

‘10’

25.0

‘11’

50.0

FIGURE 3-3:

INT_N OPERATION

Reserved

Serial Port

Write Logic

INT_N

SET

CLR

INT_MASK

<1>

<2>

<3>

<4>

SET

CLR

INT_STATUS <7>

<0>

SET

CLR

SET

CLR

SET

CLR

SET

CLR

SET

CLR

INT_STATUS<4:0>

SCL/SDA

Hub Configured by USB Host

(HubConf)

Port Power Register Updated

(PrtPwr)

Hub in USB Suspend Mode

(SuspInd)

Suspended OR

NOT Configured

SET

CLR

CFGP.INTSUSP

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