co120sq Connect One Ltd., co120sq Datasheet - Page 28

• Manufacturer Part Number: co120sq
• Description: The Ichip? Co120sq Internet Controller? Is A High-performance, Firmware-based Intelligent Peripheral Device That Provides Internet Connectivity Solutions For A Wide Range Of Embedded Devices.
• Manufacturer: Connect One Ltd.

6.3.2.2
Signal
TXDH
RXDH
USBDN
USBDP
-CTSH/
USBclock
-RTSH
iChip CO120SQ Data Sheet
Host Serial Interface Signals
Type
I(PU)
I(PD)
IO
IO
O
O
Pin No.
63
43
42
47
45
64
Description
Transmit Data Host: This pin supplies asynchronous
serial transmit data to the host.
Receive Data Host: This pin supplies asynchronous
serial receive data from the host.
When not used, can be left open.
USB bidirectional data (data +).
This pin requires an external pull-up to VDD to
maintain a high level.
USB bidirectional data (data -).
Serial Host Connection:
USB Client Connection:
When not used, can be left open.
Ready-to-Send Host: -RTSH is active only when host
hardware flow control is enabled.
When -RTSH is LOW, flow control is enabled for the
host serial port, i.e., the host may transmit to iChip.
When -RTSH is HIGH, iChip indicates that its receiver
is busy and cannot receive data from host.
When not used, can be left open.
Clear-to-Send Host (-CTSH) is active only when
host hardware flow control is enabled.
When -CTSH is LOW, flow control is enabled for
the host serial port, i.e., iChip may transmit to the
host.
When -CTSH is HIGH, iChip stops transmitting to
the host. -CTSH is sampled only at the beginning of
a transmission frame. If -CTSH is raised while a
character frame is being transmitted, that frame is
completed.
USB clock must be 4MHz square-wave clock
signal.
Pin Descriptions
6-16