68HC705JB3 datasheet(72/134 Pages) FREESCALE

72 / 134 page

GENERAL RELEASE SPECIFICATION

November 5, 1998

MOTOROLA

UNIVERSAL SERIAL BUS MODULE

MC68HC05JB3

10-4

REV 1

Figure 10-3. Supported USB Packet Types

The following sections will give some detail on each segment used to form a

complete USB transaction.

10.2.1.1 Sync Pattern

The NRZI (See Section 10.4.4.1) bit pattern shown in Figure 10-4 is used as a

synchronization pattern and is preﬁxed to each packet. This pattern is equivalent

to a data pattern of seven 0’s followed by a 1 (0x80).

Figure 10-4. Sync Pattern

The start of a packet (SOP) is signaled by the originating port by driving the D+

and D– lines from the idle state (also referred to as the “J” state) to the opposite

logic level (also referred to as the “K” state). This switch in levels represents the

ﬁrst bit of the Sync ﬁeld. Figure 10-5 shows the data signaling and voltage levels

for the start of packet and the sync pattern.

Token Packet:

OUT

SYNC

PID

ADDR

ENDP

CRC5

EOP

SETUP

Data Packet:

DATA0

SYNC

PID

DATA

CRC5

EOP

DATA1

0 - 8 bytes

Handshake Packet:

ACK

NAK

SYNC

PID

EOP

STALL

SYNC PATTERN

PID0

PID1

Idle

NRZI Data

Encoding

Freescale Semiconductor, Inc.

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