isp1504c NXP Semiconductors, isp1504c Datasheet - Page 32

• 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
For more information, refer to UTMI+ Low Pin Interface (ULPI) Specification Rev. 1.1 .
c. High-speed idle: The peripheral must detect a minimum of Chirp K-J-K-J-K-J. Each
state, the host sends a TXCMD (NOPID) with an alternating sequence of Chirp Ks
and Js. Each Chirp K or Chirp J must last no less than 40 s and no longer than
60 s.
Chirp K and Chirp J must be detected for at least 2.5 s. After seeing that
minimum sequence, the peripheral sets TERMSELECT = 0b and
OPMODE[1:0] = 00b. The peripheral is now in high-speed mode and sees !squelch
(01b on LINESTATE). When the peripheral sees squelch (10b on LINESTATE), it
knows that the host has completed chirp and waits for high-speed USB traffic to
begin. After transmitting the chirp sequence, the host changes OPMODE[1:0] to
00b and begins sending USB packets.
Rev. 01 — 19 October 2006
ISP1504A; ISP1504C
ULPI HS USB OTG transceiver
© NXP B.V. 2006. All rights reserved.
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