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FUSB302

• Rev. 2

31

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Receive Data Tokens

Receive data tokens provide in-sequence receive control and data for the receive logic. The RxFIFO can absorb as

many packets as the number of bytes in the RxFIFO (80 bytes). The tokens are defined as follows:

Table 30. Tokens Used in RxFIFO

Code

(in binary)

Name

Size (Bytes)

Description

111b_bbbb

SOP

1

First byte of a received packet to indicate that the packet is an SOP

packet (“b” is undefined and can be any bit)

110b_bbbb

SOP1

1

First byte of a received packet to indicate that the packet is an

SOP’ packet and occurs only if ENSOP1=1 (“b” is undefined and

can be any bit)

101b_bbbb

SOP2

1

First byte of a received packet to indicate that the packet is an

SOP’’ packet and occurs only if ENSOP2=1 (“b” is undefined and

can be any bit)

100b_bbbb

SOP1DB

1

First byte of a received packet to indicate that the packet is an

SOP’_DEBUG packet and occurs only if ENSOP1DB=1 (“b” is

undefined and can be any bit)

011b_bbbb

SOP2DB

1

First byte of a received packet to indicate that the packet is an

SOP’’_DEBUG packet and occurs only if ENSOP2DB=1 (“b” is

undefined and can be any bit)

010b_bbbb /

001b_bbbb /

000b_bbbb

Do Not Use

1

These can be used in future versions of this device and should not

be relied on to be any special value. (“b” is undefined and can be

any bit)