ISP1505C NXP [NXP Semiconductors], ISP1505C Datasheet - Page 40
ISP1505C
Manufacturer Part Number
ISP1505C
Description
ULPI Hi-Speed USB host and peripheral transceiver
Manufacturer
NXP [NXP Semiconductors]
Datasheet
1.ISP1505C.pdf
(76 pages)
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NXP Semiconductors
ISP1505A_ISP1505C_3
Product data sheet
Fig 17. Transmitting USB packets without the automatic SYNC and EOP generation
TXREADY
TXVALID
ENABLE
CLOCK
DP, DM
9.12 On-The-Go operations
STUFF
TXBIT
DATA
[7:0]
STP
NXT
DIR
PHY will not transmit any EOP. The ISP1505 will also detect if the PID byte is A5h,
indicating an SOF packet, and automatically send a long EOP when STP is asserted. To
transmit chirp and resume signaling, the link must set OPMODE[1:0] to 10b.
On-The-Go (OTG) is a supplement to Universal Serial Bus Specification Rev. 2.0 that
allows a portable USB device to assume the role of a limited USB host by defining
improvements, such as a small connector and low power. Non-portable devices, such as
standard hosts and embedded hosts, can also benefit from OTG features.
The ISP1505 OTG PHY is designed to support all the tasks specified in the OTG
supplement. The ISP1505 provides the front-end analog support for Host Negotiation
Protocol (HNP) and Session Request Protocol (SRP) for dual-role devices. The
supporting components include:
For complete OTG support, the system designer must add a V
detect the value on the ID pin of the USB cable. This is not provided on the ISP1505.
The following subsections describe how to use the ISP1505 OTG components.
•
•
•
Voltage comparators
– A_VBUS_VLD
– SESS_VLD (session valid, can be used for both A-session and B-session valid)
– SESS_END (session end)
Pull-up and pull-down resistors on DP and DM
Charge and discharge resistors on V
TXCMD
IDLE
00h
00h 00h 80h PID
SYNC
Rev. 03 — 26 August 2008
PID
D1
D2
ULPI HS USB host and peripheral transceiver
BUS
D3
DATA PAYLOAD
ISP1505A; ISP1505C
...
... D
N
1
D
N
BUS
FEh
power supply and
EOP
© NXP B.V. 2008. All rights reserved.
IDLE
004aab125
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