ISP1507CBS datasheet(35/74 Pages) NXP

35 / 74 page

ISP1507C_ISP1507D_1

Product data sheet

Rev. 01 — 28 May 2008

35 of 74

NXP Semiconductors

ISP1507C; ISP1507D

ULPI HS USB host and peripheral transceiver

The sequence of events related to a host and a peripheral, both with ISP1507, is as

follows:

1. High-speed idle: Initially, the host and the peripheral are idle. The host has its 15 k

Ω

pull-down resistors enabled (DP_PULLDOWN and DM_PULLDOWN are set to 1b)

and 45

Ω terminations enabled (TERMSELECT is set to 0b). The peripheral has its

Ω terminations enabled (TERMSELECT is set to 0b).

2. Full-speed suspend: When the peripheral sees no bus activity for 3 ms, it enters the

suspend state. The peripheral link places the ISP1507 into full-speed mode

(XCVRSELECT is set to 01b), removes 45

Ω terminations, and enables the 1.5 kΩ

pull-up resistor on DP (TERMSELECT is set to 1b). The peripheral link then places

the ISP1507 into low-power mode by clearing SUSPENDM, causing the ISP1507 to

draw only suspend current. The host also changes the ISP1507 to full-speed

(XCVRSELECT is set to 01b), removes 45

Ω terminations (TERMSELECT is set to

1b), and then may or may not be powered down.

3. Resume K: When the host wants to wake up the peripheral, it sets OPMODE to 10b

and transmits a full-speed K for at least 20 ms. The peripheral link sees the resume K

(10b) on LINESTATE, and asserts STP to wake up the ISP1507.

4. High-speed trafﬁc: The host link sets high-speed (XCVRSELECT is set to 00b) and

enables its 45

Ω terminations (TERMSELECT is set to 0b). The peripheral link sees

SE0 on LINESTATE and also sets high-speed (XCVRSELECT is set to 00b), and

enables its 45

Ω terminations (TERMSELECT is set to 0b). The host link sets

OPMODE to 00b for normal high-speed operation.

ISP1507CBS bảng dữ liệu(PDF) 35 Page - NXP Semiconductors