EVB-USB4640 SMSC, EVB-USB4640 Datasheet - Page 52

• Manufacturer Part Number: EVB-USB4640
• Description: EVALUATION BOARD FOR USB4640
• Manufacturer: SMSC

Specifications of EVB-USB4640

• Main Purpose: Interface, USB 2.0 Hub
• Embedded: *
• Utilized Ic / Part: USB4640
• Primary Attributes: *
• Secondary Attributes: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 638-1107

Revision 1.0 (06-09-09)
8.6.2.1
8.6.3
NAME
t1
t2
t3
t4
t5
t6
t7
nRESET
nRESET asserted
Device recovery/stabilization
8051 programs device configuration
USB attach (See Note)
Host acknowledges attach and signals USB reset
USB idle
Completion time for requests (with or without data
stage)
VSS
nRESET for EEPROM Configuration
Note: All power supplies must have reached the operating levels mandated in
USB Bus Reset
In response to the upstream port signaling a reset to the device, the device does the following:
Note: The device does not propagate the upstream USB reset to downstream devices.
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
The host then configures the device and the device’s downstream port devices in accordance with the
USB 2.0 Specification.
Hardware
asserted
sequence.
reset
Parameters, prior to (or coincident with) the assertion of nRESET.
Stabilization
Recovery/
t1
DESCRIPTION
Device
Figure 8.1 nRESET Timing for EEPROM Mode
Table 8.7 nRESET Timing for EEPROM Mode
Configuration
t2
8051 Sets
Registers
DATASHEET
High Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
t4
52
t3
Upstream
Attach
USB
MIN
100
1
USB Reset
recovery
t5
Undefined
TYP
20
t6
Idle
SMSC USB4640/USB4640i
MAX
500
100
50
5
t7
Chapter 10, DC
completion
response
request
Start
UNITS
Datasheet
msec
msec
msec
msec
msec
μ sec
μ sec