1-14 (E)
BCU-100 MM
.
NOR Flash Memory (IC4602) 64 Mbyte
Proof, MiniSystem, etc. are written
.
NVRAM (IC4601) 128 Kbyte
.
GPIO
.
DIP Switch (S4601)
.
LED (D4601-4608)
3.
SYSCON
Using the SH-2 micro controller made by Renesas and
TOPPERS/JSP for the OS, the power supply ON/OFF is
controlled, main chips are initialized, and the overall set is
monitored. Also, the following can be loaded via an
external interface: basic information such as set status and
generated errors, plus product information saved to
EEPROM, all setting values, and logs.
(1) SH-2 micro controller
Centered in the SH-2 micro controller, the SYSCON
functions are realized with the following chips.
.
Renesas R5F70845AN80FPV (IC6005)
Clock : 80 MHz
ROM : 512 Kbyte
RAM : 32 Kbyte
.
SRAM 32 Kbyte (IC6007)
.
I
2
C Bus switch (IC6002)
.
FPGA Altera EP1C12F324C8N (IC6001)
1) SH-2 interface
The address bus 18 bit , data bus 16 bit bus can use
the control lines to send and receive data at fast
speeds.
.
SH-ADDR [1-18] : Address line
.
SH-DATA [0-15] : Data line
.
/RD, /WRH, /WRL : Read/Write control
2) GPIO : IO port expansion
The circuit in the BE board has many signal lines
than must be controlled by the SYSCON, so FPGA
(IC6001) is used to expand the IO port. It catalogs
the typical control signals.
.
/THERMAL_FAIL
Indicates an error in the internal power supply unit
temperature.
.
/POW_FAIL
Indicates an error in the
+
12 V,
+
5 V, or
+
3.3 V
output created in the power supply unit or RE-255
board.
.
SW-n
Controls turning each of the local power supplies
on and off.
.
BEVRM_VIDn
Voltage control signal for the BE core voltage
.
RSXVRM_VIDn
Voltage control signal for the RSX core voltage
3) Interrupt controller
Controls the interrupt generated from each interrupt
line in the BE board and the function block in
FPGA.
Input signal for interrupt controller
.
/BE_INT
.
/RSX_INT
.
/SB_INT
.
RSX_VINTE
Output signal for interrupt controller. Imposes
interrupt on SH-2 microcomputer.
.
NMI
.
/IRQ7
.
/IRQ5
.
/IRQ3
4) SPI serial bus
SYSCON performs operations such as setting the
resistor for the main chips on the BE board and
monitoring the status through the SPI serial bus.
.
BE_SPI
.
RSX_SPI
.
SB_SPI
.
IO_SPI
5) UART
Through the RS-232C connector, every command in
the SYSCON or status inside the set is read or
written. UART is included to provide an interface to
SCC.
.
FPGA_UART0
.
FPGA_UART1
6) Mechanism for updating SYSCON and FPGA
The design ensures that the SYSCON firmware and
FPGA configuration data can be overwritten with
upgrades through the serial terminal (RS-232C) or
network (NETWORK-1, -2) without requiring any
special tools. Also, the SYSCON firmware is written
in two locations in memory, so updates can be
performed safely. The SYSCON firmware is written
in the SH-2 chip (IC6005), and the SYSCON FPGA
configuration data is written in the configuration
ROM (IC6004).
7) Real time clock (RTC)
RV5C387A (IC6590) generates the real time clock
from 32.768 kHz output from the crystal oscillator
(X6001). The real time clock is backed up with a
lithium battery, so the correct time can be kept even
when not connected to an AC power supply. Also, if
the lithium battery is drained by stopping oscillation
on the real time clock and power is supplied again
from the AC power supply, an error is detected
when the SYSCON starts up.
