USB334X datasheet(51/92 Pages) MICROCHIP

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DS00002646A-page 51

USB334x

Low Speed uses the same Linestate decoding threshold as Full Speed. Low Speed re-defines the Idle state as an inver-

sion of the Full Speed idle to account for the inversion which occurs in the hub repeater path. Linestates are decoded

exactly as in Table 6-4 with the idle as a K state.

6.3.1.1.2

HS Linestate Definition

In HS mode the data transmission is too fast for Linestate to be transmitted with each transition in the data packet. In

HS operation the Linestate is redefined to indicate activity on the USB interface. The Linestate will signal the assertion

and de-assertion of squelch in HS mode.

6.3.1.1.3

HS CHIRP Linestate Definition

There is also a third use of Linestate in HS Chirp where when the Host and Peripheral negotiate the from FS mode to

HS mode. While the transitions from K to J or SE0 are communicated to the Link through the Linestate information.

TABLE 6-4:

USB LINESTATE DECODING IN FS AND LS MODE

Linestate[1:0]

DP SE RX

DM SE RX

State

SE0

USB Reset

J (FS idle)

J State

K (LS Idle)

K State

SE1

TABLE 6-5:

USB LINESTATE DECODING IN HS MODE

Linestate[1:0]

DP SE RX

DM SE RX

State

SE0

HS Squelch asserted

HS Squelch de-asserted

Invalid State

SE1

Invalid State

TABLE 6-6:

USB LINESTATE DECODING IN HS CHIRP MODE

Linestate[1:0]

DP SE RX

DM SE RX

State

SE0

HS Squelch asserted

HS Squelch de-asserted & HS

differential Receiver = 1

HS Squelch de-asserted & HS

differential Receiver = 0

SE1

Invalid State

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