isp1505a NXP Semiconductors, isp1505a Datasheet - Page 23

• Manufacturer Part Number: isp1505a
• Description: Isp1505a; Isp1505c Ulpi Hi-speed Universal Serial Bus Host And Peripheral Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 8.
ISP1505A_ISP1505C_1
Product data sheet
Command
type name
Idle
Packet
transmit
TXCMD byte format
Command code
DATA[7:6]
00b
01b
9.4.2 Fault detection
9.5.1 TXCMD
9.5 TXCMD and RXCMD
The ISP1505 supports external V
circuit is required for host applications that supply more than 100 mA on V
between 4.75 V to 5.25 V. For low-power applications supplying less than 100 mA, the
V
utilize the internal A_VBUS_VLD comparator.
The ISP1505 supports external V
indicator signal. The indicator signal must be connected to the V
the ISP1505 to monitor the digital overcurrent input, the link must set the
USE_EXT_VBUS_IND bit in the OTG Control register. By default, the digital indicator is
interpreted by the ISP1505 as active LOW. That is, a LOW value on V
a fault condition has been detected. If the external fault detector provides an active HIGH
digital indicator, the link must set the IND_COMPL bit in the Interface Control register to
logic 1. The IND_PASSTHRU bit must be set to logic 1.
By default, the ISP1505 will qualify the external FAULT input with the internal V
comparator. This can be disabled by setting the IND_PASSTHRU bit to logic 0.
Commands between the ISP1505 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 ISP1505 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 ISP1505, 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 shown in later sections.
BUS
power line can directly be connected to the V
Command
payload DATA[5:0]
00 0000b
00 0000b
00 XXXXb
Rev. 01 — 19 October 2006
Table
Command
name
NOOP
NOPID
PID
8. Any values other than those in
BUS
BUS
fault detector circuits. An overcurrent detection
fault detector circuits that output a digital fault
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 ISP1505 starts
transmitting only after accepting the next data byte.
Transmit USB packet. DATA[3:0] indicates USB packet
identifier PID[3:0].
ULPI HS USB host and peripheral transceiver
ISP1505A; ISP1505C
BUS
pin on the ISP1505 and the link can
Table 8
BUS
/FAULT pin. To enable
BUS
are illegal and may
© NXP B.V. 2006. All rights reserved.
/FAULT indicates
BUS
for voltages
BUS
valid
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