co120sq Connect One Ltd., co120sq Datasheet - Page 16

• 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.

6.1.2.2
Signal
TXDH
RXDH
USBDN
USBDP
-CTSH/
USBclock
-RTSH
iChip CO120SQ Data Sheet
Host Serial Interface Signals (LAN Connection)
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 bi-directional data (data+).
This pin requires an external pull-up to VDD to
maintain a high level.
USB bi-directional data (data-).
Serial Host Connection:
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. This means that iChip can 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 transmitted, that frame is
completed.
USB Device Connection:
USB clock must be a 4 MHz square-wave clock
signal.
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.
Pin Descriptions
6-4