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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 10/40頁 |
| 文件大?。?/td> | 770K |
| 代理商： | ISP1501 |
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Philips Semiconductors
ISP1501
Hi-Speed USB peripheral transceiver
Product data
Rev. 02 — 21 November 2002
10 of 40
9397 750 10025
Koninklijke Philips Electronics N.V. 2002. All rights reserved.
8.2 State transitions
A Hi-Speed USB peripheral handles more than one electrical state under the USB
specification. The ISP1501 accommodates the various states through the MODE[1:0]
input pins.
Table 4
summarizes the operating states.
8.2.1
Disconnect state
In the disconnect state (MODE[1:0] = 00), an external pull-up resistor on pin RPU is
not connected to the DP line. The FS transceiver is enabled, and the legacy (Original
USB) SIE interface is active (see
Figure 3
).
11
3
High-speed (HS)
chirp
2
44
45
46
47
48
TX_VALID
TX_BS_EN
TEST_J_K
RX_BS_ERROR
RX_INACTIVE
RX_VALID
Table 3:
MODE[1:0]
Interface selection
…continued
State
State name
Pin
Function
Table 4:
State
0
Operating states
State name
Disconnect
Description
Legacy (full-speed) SIE interface; FS transceiver
enabled; pull-up resistor on pin RPU disconnected
Legacy (full-speed) SIE interface; FS transceiver
enabled; full-speed slew rate selected; pull-up resistor
on pin RPU connected to pin DP
High-speed SIE interface; HS transceiver enabled;
FS transceiver on permanent SE0 to provide 45
termination; pull-up resistor on pin RPU disconnected
High-speed SIE interface; HS transceiver enabled;
FS transceiver disabled; pull-up resistor on pin RPU
connected to pin DP
1
Full-speed (FS)
2
High-speed (HS)
3
High-speed (HS) chirp
Fig 3.
Disconnect state.
004aaa039
7
9
6 DM
DP
ISP1501
45
45
1.5 k
±
5%
3.3 V
RPU
FS driver
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