CY3683(2008) Просмотр технического описания (PDF) - Cypress Semiconductor
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CY3683 Datasheet PDF : 15 Pages
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CY7C68000A
Operational Modes
The operational modes are controlled by the OpMode signals.
The OpMode signals are capable of inhibiting normal operation
of the transceiver and evoking special test modes. These modes
take effect immediately and take precedence over any pending
data operations. The transmission data rate when in OpMode
depends on the state of the XcvrSelect input.
OpMode[1:0]
00
01
10
11
Mode
0
1
2
3
Description
Normal operation
Non-driving
Disable Bit Stuffing and NRZI
encoding
Reserved
Mode 0 enables the transceiver to operate with normal USB data
decoding and encoding.
Mode 1 enables the transceiver logic to support a soft disconnect
feature that tri-states both the HS and FS transmitters, and
removes any termination from the USB, making it appear to an
upstream port that the device is disconnected from the bus.
Mode 2 disables Bit Stuff and NRZI encoding logic so ‘1’s loaded
from the data bus becomes ‘J’s on the DPLUS/DMINUS lines
and ‘0’s become ‘K’s.
DPLUS/DMINUS Impedance Termination
The CY7C68000A does not require external resistors for USB
data line impedance termination or an external pull up resistor on
the DPLUS line. These resistors are incorporated into the part.
They are factory trimmed to meet the requirements of USB 2.0.
Incorporating these resistors also reduces the pin count on the
part.
Document #: 38-08052 Rev. *G
Page 3 of 15
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