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USB2641 Datasheet(PDF) 42 Page - Microchip Technology

Part # USB2641
Description  Ultra Fast USB 2.0 Multi-Format Flash Media Controller/USB Hub Combo
PDF  60 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB2641 Datasheet(HTML) 42 Page - Microchip Technology

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USB2640/USB2641
DS00001947C-page 42
 2015-2021 Microchip Technology Inc.
7.5.2.1
nRESET for EEPROM Configuration
7.5.3
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.
Negates PRTCTL[3:2] to all downstream ports.
4.
Clears all TT buffers.
5.
Moves device from suspended to active (if suspended).
6.
Complies with Section 11.10 of the USB 2.0 Specification for behavior after completion of the reset sequence.
The host then configures the device and the device’s downstream port devices in accordance with the USB 2.0 Speci-
fication.
FIGURE 7-1:
NRESET TIMING FOR EEPROM MODE
TABLE 7-6:
NRESET TIMING FOR EEPROM MODE
Name
Description
MIN
TYP
MAX
Units
t1
nRESET asserted.
1
sec
t2
Device recovery/stabilization.
500
sec
t3
8051 programs device configuration
20
50
msec
t4
USB attach (See Note).
100
msec
t5
Host acknowledges attach and signals USB reset.
100
msec
t6
USB idle.
Undefined
msec
t7
Completion time for requests (with or without data
stage).
5
msec
Note:
All power supplies must have reached the operating levels mandated in Section 9.0, "DC Parameters," on
page 47, prior to (or coincident with) the assertion of nRESET.
Note:
The device does not propagate the upstream USB reset to downstream devices.
t1
t2
t4
t5
t6
t7
nRESET
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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