MCS9845 MosChip Semiconductor, MCS9845 Datasheet - Page 12

• Manufacturer Part Number: MCS9845
• Description: PCI Dual UART
• Manufacturer: MosChip Semiconductor

PCI to 2 Serial (2S): 0002
PCI to 4 Serial (4S): 0004
PCI to 6 Serial (6S): 0006
PCI to 4 Serial and 1 Parallel (4S1P): 0014 (default)
Use default values for all other locations in the EEPROM.
Page 12
The MCS9820 EEPROM controller reads the least signifi cant byte fi rst and then the most signifi cant byte in
16-bit format. Therefore, when writing to the EEPROM, the least signifi cant byte is written fi rst, followed by the
most signifi cant byte. For example, the value 9845 would be written as 45 98.
Changing the Device ID, Vendor ID, and Subsystem Vendor ID values requires corresponding changes in the
device drivers to ensure proper functioning of the MCS9845CV. These fi elds can be customized to meet user
requirements. The Subsystem Vendor ID value can be changed to arrive at a different product confi guration
using the EEPROM as shown below.
Product Type: Subsystem Vendor ID
EEPROM Key Locations
MCS9845
PCI Dual UART with ISA Bridge
Subsystem Vendor ID
Class Code Interface
Subsystem ID
Header Type
Interrupt Pin
Class Code
Revision ID
Description
Vendor ID
Device ID
EEPROM Address
0x0A (MS Byte)
0x0C (LS Byte)
0x0A (LS Byte)
Location
0x2C
0x00
0x02
0x08
0x2E
0x3E
Word/Byte Data
9845
9710
0780
0014
1000
00
01
00
01
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