ISP1505CBS datasheet(39/76 Pages) NXP

39 / 76 page

ISP1505A_ISP1505C_3

Product data sheet

Rev. 03 — 26 August 2008

38 of 75

NXP Semiconductors

ISP1505A; ISP1505C

ULPI HS USB host and peripheral transceiver

9.11 No automatic SYNC and EOP generation (optional)

This setting allows the link to turn off the automatic SYNC and EOP generation, and must

be used for high-speed packets only. It is provided for backward compatibility with legacy

controllers that include SYNC and EOP bytes in the data payload when transmitting

packets. The ISP1505 will not automatically generate the SYNC and EOP patterns when

OPMODE[1:0] is set to 11b. The ISP1505 will still NRZI encode data and perform bit

stufﬁng. An example of a sequence is shown in Figure 17. The link must always send

packets using the TXCMD (NOPID) type. The ISP1505 does not provide a mechanism to

control bit stufﬁng in individual bytes, but will automatically turn off bit stufﬁng for EOP

when STP is asserted with data set to FEh. If data is set to 00h when STP is asserted, the

Timing is not to scale.

Fig 16. Remote wake-up from low-power mode

DATA

[7:0]

LINESTATE

TXCMD

REGW

TXCMD

REGW

00h

TXCMD

NOPID

DIR

STP

NXT

XCVR

SELECT

01b (FS), 10b (LS)

00b (HS only)

TERM

SELECT

MODE

10b

00b

DATA

[7:0]

LINESTATE

TXCMD

REGW

RXCMD

00h

TXCMD

NOPID

RXCMD

TXCMD

REGW

DIR

STP

NXT

XCVR

SELECT

00b (HS), 01b (FS), 10b (LS)

00b (HS only)

TERM

SELECT

MODE

10b

00b

004aaa718

0b (HS only)

ISP1505CBS Datasheet(PDF) 39 Page - NXP Semiconductors

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