Service manual

4. BOARD/UNIT DESCRIPTION
4.6 Service Manual BSM-4100
The DPU board receives the vital sign information (analog signal or digital data)
from the analog boards such as ECG RESP1 board and MP1 board.
The CPU on the DPU board executes the primary processing of the vital sign
information.
All the analog signals for the vital sign parameters are multiplexed and converted
to the digital data along the multiplexing timing. The DMA assigned each vital
sign parameter data into the individually specified area of the 1 MB SRAM on the
DPU board. The digital data converted from the vital sign analog signal at one of
the analog boards is sent to the bus on the DPU board with serial data
communication. This digital data is also assigned into the individually specified
area of the 1 MB SRAM by the DMA.
MC68SEC000 is used as the CPU. The clock frequency is 20 MHz. The CPU
controls the dedicated gate array ASIC (SYLPH) which is used as the data process
controller to control the A to D converter and the DMA and to mediate between the
accesses from the host CPU on the MAIN board and from the CPU on the DPU
board to the common memory (dual port RAM). The SYLPH has an I/O port.
Flash EEPROM is used as the system ROM on the board. The system ROM can be
programmed by the host CPU at the Boot. Refer to “MAIN Board” section.
DPU Board
Analog data
Digital data
A to D
System
ROM
SYLPH
DMA
CPU on the DPU board
System
RAM
I/O
Common memory
(Dual port RAM)
Host CPU on the MAIN board
ZB-800 I/F