isp1504c NXP Semiconductors, isp1504c Datasheet - Page 43

• 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
Fig 21. Transmitting USB packets without automatic SYNC and EOP generation
ENABLE
CLOCK
READY
STUFF
VALID
9.12 On-The-Go operations
TXBIT
DATA
[7:0]
STP
NXT
DIR
DP,
DM
TX
TX
PHY will not transmit any EOP. The ISP1504 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 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 ISP1504 OTG PHY is designed to support all the tasks specified in the OTG
supplement. The ISP1504 provides the front-end analog support for Host Negotiation
Protocol (HNP) and Session Request Protocol (SRP) for dual-role devices. The
supporting components include:
The following subsections describe how to use the ISP1504 OTG components.
•
•
•
•
•
TXCMD
Built-in 5 V charge pump
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
ID detector indicates if mini-A or mini-B plug is inserted
Charge and discharge resistors on V
IDLE
00h
00h 00h 80h PID
SYNC
Rev. 01 — 19 October 2006
PID
D1
D2
BUS
D3
DATA PAYLOAD
ISP1504A; ISP1504C
...
...
D
N
ULPI HS USB OTG transceiver
1
D
N
FEh
EOP
© NXP B.V. 2006. All rights reserved.
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