isp1705 NXP Semiconductors, isp1705 Datasheet - Page 33

• Manufacturer Part Number: isp1705
• Description: Ulpi Hi-speed Usb Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ISP1705_1
Product data sheet
Fig 12. Single and back-to-back RXCMDs from the ISP1705 to the link
DATA [ 7:0 ]
CLOCK
NXT
STP
DIR
10.3.1 Linestate encoding
The ISP1705 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 .
Table 17.
LINESTATE[1:0] reflects the current state of DP and DM. Whenever the ISP1705 detects
a change in DP or DM, an RXCMD will be sent to the link with the new LINESTATE[1:0]
value. The value given on LINESTATE[1:0] depends on the setting of various registers.
Table 18
peripherals.
which applies to host controllers. Dual-role devices must choose the correct table,
depending on whether it is in peripheral or host mode.
DATA
1 to 0
3 to 2
5 to 4
6
7
turnaround
shows the LINESTATE[1:0] encoding for upstream facing ports, which applies to
Name
LINESTATE
V
RxEvent
ID
ALT_INT
RXCMD byte format
BUS
Table 19
state
Single RXCMD
RXCMD
shows the LINESTATE[1:0] encoding for downstream facing ports,
Description and value
LINESTATE signals: For a definition of LINESTATE, see
DATA0 — LINESTATE0
DATA1 — LINESTATE1
Encoded V
see
Encoded USB event signals: For an explanation of RxEvent,
see
Reflects the state of the ID pin. Valid 50 ms after ID_PULLUP is set to
logic 1.
By default, this signal is not used and is not needed in typical designs.
Optionally, the link can enable the BVALID_RISE and/or BVALID_FALL
bits in the PWR_CTRL register (see
changes in BVALID will cause an RXCMD to be sent to the link with the
ALT_INT bit asserted.
Rev. 01 — 13 June 2008
turnaround
Section
Section
BUS
10.3.2.
10.3.4.
voltage state: For an explanation of the V
turnaround
Figure
Back-to-back RXCMDs
RXCMD
ULPI Hi-Speed USB transceiver
Section
12. For details and diagrams,
RXCMD
11.15). Corresponding
© NXP B.V. 2008. All rights reserved.
turnaround
ISP1705
004aaa695
Section
BUS
state,
10.3.1.
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