參數(shù)資料
型號(hào)： ISP1501
英文描述： Hi-Speed Universal Serial Bus peripheral transceiver
中文描述： 高速通用串行總線外設(shè)收發(fā)器
文件頁(yè)數(shù)： 27/40頁(yè)
文件大小： 770K
代理商： ISP1501
Philips Semiconductors
ISP1501
Hi-Speed USB peripheral transceiver
Product data
Rev. 02 — 21 November 2002
27 of 40
9397 750 10025
Koninklijke Philips Electronics N.V. 2002. All rights reserved.
16.1 High-speed signals
High-speed USB signals are characterized using eye patterns. For measuring the eye
patterns 4 test points have been defined (see
Figure 25
). The Universal Serial Bus
Specification Rev. 2.0defines the eye patterns in several ‘templates’. For ISP1501
only Templates 1 and 4 are relevant.
16.1.1
Template 1 (transmit waveform)
The eye pattern in
Figure 26
defines the transmit waveform requirements for a hub
(measured at TP2) or a device without a captive cable (measured at TP3).
Remark:
Captive cables have a vendor-specific connector to the peripheral
(hardwired or detachable) and a USB “A” connector on the other side. For hot
plugging, the vendor-specific connector must meet the same performance
requirements as a USB “B” connector.
The corresponding signal levels and timings are given in
Table 15
. Timings are given
as a percentage of the unit interval (UI), which represents the nominal bit duration
T
PERIOD
for a 480 Mbit/s transmission rate.
Fig 25. Eye pattern measurement planes.
MBL205
transceiver
hub circuit board
A
connector
traces
TP1
TP2
USB cable
transceiver
device circuit board
B
connector
traces
TP3
TP4
Fig 26. Template 1 eye pattern (transmit waveform).
MBL206
level 1
level 2
point 3
point 4
point 2
point 1
point 5
0
100
relative duration
(% of unit interval)
400 mV
+
400 mV
0
0
100
100
200
300
400
500
600
differential
output
voltage
(mV)
200
300
400
500
600
point 6
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