ISP1508AET NXP Semiconductors, ISP1508AET Datasheet - Page 29

• Manufacturer Part Number: ISP1508AET
• Description: RF Transceiver USB 2.0 ULPI TRNSCVR
• Manufacturer: NXP Semiconductors

Specifications of ISP1508AET

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935283548118 ISP1508AET-T

NXP Semiconductors
10. Protocol description
Table 15.
ISP1508A_ISP1508B_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
10.2.1 TXCMD
10.2.2 RXCMD
10.1 ULPI references
10.2 TXCMD and RXCMD
The ISP1508 provides an 8-pin or 12-pin ULPI interface to communicate with the link. It is
highly recommended that users of the ISP1508 read UTMI+ Specification Rev. 1.0 and
UTMI+ Low Pin Interface (ULPI) Specification Rev. 1.1 .
Commands between the ISP1508 and the link are described in the following subsections.
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 ISP1508 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 ISP1508, 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
result in undefined behavior.
Various TXCMD packet and register sequences are given in later sections.
The ISP1508 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
Command payload
DATA[5:0]
00 0000b
00 0000b
00 XXXXb
10 1111b
XX XXXXb
10 1111b
XX XXXXb
Table
Rev. 01 — 14 August 2007
Command
name
NOOP
NOPID
PID
EXTW
REGW
EXTR
REGR
15. Any values other than those in
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 ISP1508 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.
ISP1508A; ISP1508B
Table
16.
Table 15
ULPI HS USB transceiver
© NXP B.V. 2007. All rights reserved.
are illegal and will
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