Service manual

Storage and Transmission (Option #A05 0nly)
3-14
Figure 3-6 Option #A05 PC Assembly Block Diagram
M177XA Expansion Connector
The expansion connector on the Option #A05 PC assembly mates with the M177XA
cardiograph expansion connector. This connection provides the Option #A05 PC
assembly access to the cardiograph Address Bus, Data Bus, System Control Bus, and
power supplies.
Gate Array
The gate array integrates the following functions:
• Address decoding and chip selects for the expansion ROMs (ROM-X1 and ROM-X2)
• Flash memory controller
• Interface to the Dual UART
ROM-X1, ROM-X2
ROM-X1 and ROM-X2 are ROMs provided for the cardiograph firmware expansion. The
cardiograph CPU controls and execute the firmware in these ROMs.
Gate
Array
18.432 MHz
Oscillator
Dual
UART
RS-232
Drivers
M177X
Expansion
Connector
Address
Data
SYS Control
GA Control
VPROG
Supply
ROM-X1
256K x 16
ROM-X2
256K x 16
FLASH 1
1M x 16
FLASH 2
1M x 16
Serial Port
Connector 1
Serial Port
Connector 2