isp1504c NXP Semiconductors, isp1504c Datasheet - Page 21

• Manufacturer Part Number: isp1504c
• Description: Ulpi Hi-speed Universal Serial Bus On-the-go Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ISP1504A_ISP1504C_1
Product data sheet
completed. After every reset, an RXCMD is sent to the link to update USB status
information. After this sequence, the ULPI bus is ready for use and the link can start USB
operations.
If a crystal is attached or a clock is driven into the XTAL1 pin, the ISP1504 will drive a
60 MHz clock out from the CLOCK pin when DIR de-asserts. This is shown as CLOCK
(output) in
pin, DIR will de-assert when internal clocks have synchronized. This is shown as CLOCK
(input) in
The recommended power-up sequence for the link is as follows:
•
•
•
The link waits for 1 ms, ignoring all the ULPI pin status.
The link may start to detect DIR status level. If DIR is detected as LOW for three clock
cycles, the link may send a RESET command.
The ULPI interface is ready for use.
Figure
Figure
6.
6. If no crystal is attached and a 60 MHz clock is driven into the CLOCK
Rev. 01 — 19 October 2006
ISP1504A; ISP1504C
ULPI HS USB OTG transceiver
© NXP B.V. 2006. All rights reserved.
21 of 84