ISP1505C NXP [NXP Semiconductors], ISP1505C Datasheet - Page 33
ISP1505C
Manufacturer Part Number
ISP1505C
Description
ULPI Hi-Speed USB host and peripheral transceiver
Manufacturer
NXP [NXP Semiconductors]
Datasheet
1.ISP1505C.pdf
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NXP Semiconductors
ISP1505A_ISP1505C_3
Product data sheet
Fig 12. High-speed receive-to-transmit packet timing
CLOCK
DP or
DATA
[7:0]
STP
NXT
DIR
DM
D
N 4
DATA
D
N 3
9.9 Preamble
D
EOP
N 2
Preamble packets are headers to low-speed packets that must travel over a full-speed
bus, between a host and a hub. To enter preamble mode, the link sets
XCVRSELECT[1:0] = 11b in the Function Control register. When in preamble mode, the
ISP1505 operates just as in full-speed mode, and sends all data with the full-speed rise
time and fall time. Whenever the link transmits a USB packet in preamble mode, the
ISP1505 will automatically send a preamble header at full-speed bit rate before sending
the link packet at low-speed bit rate. The ISP1505 will ensure a minimum gap of four
full-speed bit times between the last bit of the full-speed PRE PID and the first bit of the
low-speed packet SYNC. The ISP1505 will drive a J for at least one full-speed bit time
after sending the PRE PID, after which the pull-up resistor can hold the J state on the bus.
An example transmit packet is shown in
In preamble mode, the ISP1505 can also receive low-speed packets from the full-speed
bus.
(three to eight clocks)
D
RX end delay
N 1
D
N
turnaround
USB interpacket delay (8 to 192 high-speed bit times)
Rev. 03 — 26 August 2008
link decision time (1 to 14 clocks)
IDLE
Figure
ULPI HS USB host and peripheral transceiver
ISP1505A; ISP1505C
13.
(one to two clocks)
TXCMD
TX start delay
© NXP B.V. 2008. All rights reserved.
SYNC
D0
004aaa713
32 of 75
D1
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