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USB2240 データシート(PDF) 27 Page - Microchip Technology

部品番号 USB2240
部品情報  Ultra Fast USB 2.0 Multi-Format
PDF  43 Pages
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB2240 データシート(HTML) 27 Page - Microchip Technology

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 2010 - 2015 Microchip Technology Inc.
DS00001979A-page 27
USB224X
7.3.1.1
RESET_N for EEPROM Configuration
7.3.2
USB BUS RESET
In response to the upstream port signaling a reset to the device, the device does the following:
1.
Sets default address to ‘0’.
2.
Sets configuration to: Unconfigured.
3.
All transactions are stopped.
4.
Processor reinitializes and restarts.
5.
All media interfaces are disabled.
FIGURE 7-1:
RESET_N TIMING FOR EEPROM MODE
TABLE 7-2:
RESET_N TIMING FOR EEPROM MODE
Name
Description
MIN
TYP
MAX
Units
t1
RESET_N asserted
1
μsec
t2
Device recovery/stabilization
500
μsec
t3
8051 programs device configuration
20
50
msec
t4
USB attach
100
msec
t5
Host acknowledges attach and signals USB reset
100
msec
t6
USB idle
Undefined
msec
t7
Ready to handle requests (with or without data)
5
msec
Note:
All power supplies must have reached the operating levels mandated in Section 9.0, "DC Parameters," on
page 31, prior to (or coincident with) the assertion of RESET_N.
t1
t2
t4
t5
t6
t7
RESET_N
VSS
Hardware
reset
asserted
Device
Recovery/
Stabilization
8051 Sets
Configuration
Registers
Attach
USB
Upstream
USB Reset
recovery
Idle
Start
completion
request
response
t3



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