MCS7703 MosChip, MCS7703 Datasheet - Page 6

• Manufacturer Part Number: MCS7703
• Description: Usb 1.1 To Single Serial Port
• Manufacturer: MosChip

Page 6
MCS7703
USB 1.1 to Single Serial Port
Functional Description
The MCS7703 consists of two major functional blocks, the USB Controller and the Serial Interface. The USB
Controller provides Control, Bulk-In, and Bulk-Out endpoints to the USB host. The Serial Interface consists of
transmit and receive blocks that connect to an external RS-232 transceiver.
USB Interface
The USB interface to the Host Controller includes a Control endpoint, a Bulk-In endpoint, a Bulk-Out endpoint,
and an Interrupt endpoint. The USB controller supports the USB 1.1 specification. Hence, it supports all
standard functionality associated with device enumeration, standard USB device requests, etc. In addition,
there is a set of Vendor Specific commands provided to allow a USB driver to access registers and ROM in
the USB controller.
EEPROM Interface
The MCS7703 uses an optional external EEPROM to load Vendor Specific parameters. The EEPROM is
connected through a convenient 2-wire I
After Power-On Reset, the MCS7703 reads two Bytes from the EEPROM. If the two Bytes are equal to
9710 (hex) then it recognizes the EEPROM as being present and the next 8 Bytes are read. Otherwise the
MCS7703 reverts to its default operating mode using default values.
If the EEPROM is present, the following data will be loaded into the MCS7703 registers.
118-103
102-61
12-11
60-13
Byte
10-8
1-0
3-2
5-4
7-6
Byte Count
48
42
16
2
2
2
2
3
2
Manufacture-ID
Product Name
Serial Number
Language-ID
EE Check
2
C interface.
Name
DCR
VID
PID
RN
“MosChip Semiconductor” in UNICODE
Release Number in BCD format (0001)
Device Configuration Register (DCR)
“USB-Serial Controller” in UNICODE
Language-ID in Hex format (0409)
EEPROM Present Check, (9710).
“XXXXXXXX” in UNICODE
Product-ID (7703)
Vendor-ID (9710)
Description
Rev. 1.6