isp1504a1 NXP Semiconductors, isp1504a1 Datasheet - Page 26

• Manufacturer Part Number: isp1504a1
• Description: Isp1504a1; Isp1504c1 Ulpi Hi-speed Universal Serial Bus On-the-go Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 10.
ISP1504A1_ISP1504C1_1
Product data sheet
Command
type name
Idle
Packet
transmit
Register
write
Register
read
TXCMD byte format
Command code
DATA[7:6]
00b
01b
10b
11b
9.5.1 TXCMD
9.5.2 RXCMD
By default, the link must drive the ULPI bus to its idle state of 00h. To send commands and
USB packets, the link drives a nonzero value on DATA[7:0] to the ISP1504x1 by sending a
byte called TXCMD. Commands include USB packet transmissions, and register reads
and writes. Once the TXCMD is interpreted and accepted by the ISP1504x1, the NXT
signal is asserted and the link can follow up with the required number of data bytes. The
TXCMD byte format is given in
illegal and will result in undefined behavior.
Various TXCMD packet and register sequences are shown in later sections.
The ISP1504x1 communicates status information to the link by asserting DIR and sending
an RXCMD byte on the DATA bus. The RXCMD data byte format follows UTMI+ Low Pin
Interface (ULPI) Specification Rev. 1.1 and is given in
The ISP1504x1 will automatically send an RXCMD whenever there is a change in any of
the RXCMD data fields. The link must be able to accept an RXCMD at any time; including
single RXCMDs, back-to-back RXCMDs, and RXCMDs at any time during USB receive
packets when NXT is LOW. An example is shown in
refer to UTMI+ Low Pin Interface (ULPI) Specification Rev. 1.1 .
An RXCMD may not be sent when exiting low-power mode or serial mode, if the interrupt
condition is removed before exiting.
Command
payload DATA[5:0]
00 0000b
00 0000b
00 XXXXb
10 1111b
XX XXXXb
10 1111b
XX XXXXb
Rev. 01 — 6 August 2007
Command
name
NOOP
NOPID
PID
EXTW
REGW
EXTR
REGR
Table
10. Any values other than those in
ISP1504A1; ISP1504C1
Command description
No operation. 00h is the idle value of the data bus.
The link must drive NOOP by default.
Transmit USB data that does not have a PID, such as
chirp and resume signaling. The ISP1504x1 starts
transmitting only after accepting the next data byte.
Transmit USB packet. DATA[3:0] indicates USB
packet identifier PID[3:0].
Extended register write command (optional). The
8-bit address must be provided after the command is
accepted.
Register write command with 6-bit immediate
address.
Extended register read command (optional). The
8-bit address must be provided after the command is
accepted.
Register read command with 6-bit immediate
address.
Figure
Table
ULPI HS USB OTG transceiver
9. For details and diagrams,
11.
© NXP B.V. 2007. All rights reserved.
Table 10
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